gmc trouble codes list

Trouble codes can be a source of frustration for GMC vehicle owners, but they are essential for diagnosing and resolving issues with your vehicle. In this comprehensive guide, we will decode GMC trouble codes list, helping you understand what they mean and how to address them effectively.

*Please press the following to search through the GMC fault code list: CTRL+ F

GMC Trouble Codes List
Trouble Code Fault Location Probable Cause
P0300 Cylinder Misfire Detected Random Cylinders Ignition coils
P0449 Evaporative emission (EVAP) system, vent valve circuit malfunction
P1000 – P1099 (Fuel and air metering and auxiliary emission control)
P1093 Fuel rail pressure (FRP) sensor, command/actual fuel pressure -signal variation Wiring, poor connections, FRP sensor
P1094 Fuel rail pressure (FRP) sensor -signal out ofrange Wiring, poor connections, FRP sensor
P1100 – P1199 (Fuel and air metering)
P1101 Intake airflow -incorrect Wiring, mechanical fault, engine coolant temperature (ECT) sensor, barometric pressure (BARO) sensor, intake air temperature (IAT) sensor, manifold absolute pressure (MAP) sensor,mass air flow (MAF) sensor, throttle position (TP) switch
P1106 Manifold absolute pressure (MAP) sensor voltage high, intermittent Wiring open circuit/short circuit to positive, poor connections
P1107 Manifold absolute pressure (MAP) sensor voltage low, intermittent Wiring short circuit to ground, poor connections
P1111 Intake air temperature (IAT) sensor -voltage high,intermittent Wiring open circuit/short to positive, poor connections
P1112 Intake air temperature (IAT) sensor -voltage low,intermittent Wiring short circuit to ground
P1114 Engine coolant temperature (ECT) sensor voltage low, intermittent Wiring short circuit to ground, poor connections
P1115 Engine coolant temperature (ECT) sensor voltage high, intermittent Wiring open circuit/short to positive, poor connections
P1120 Throttle motor position sensor 1 -circuit malfunction Wiring, throttle control module
P1121 Throttle position (TP) sensor -voltage high, intermittent Wiring open circuit/short to positive, poor connections
P1122 Throttle position (TP) sensor -voltage low,intermittent Wiring open circuit/short to ground, poor connections
P1125 Accelerator pedal position (APP) sensor 1/2/3 -signal variation Wiring, APP sensor, ECM
P1133 Oxygen sensor (02S)/heated oxygen sensor(H02S) 1, bank 1 -insufficient switching Wiring, exhaust system leaking, 02S/H02S
P1134 Heated oxygen sensor (H02S) 1, bank 1 slow response Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1137 Heated oxygen sensor (H02S) 2, bank 1 voltagelow Wiring, exhaust system leaking, H02S
P1138 Heated oxygen sensor (H02S) 2, bank 1 voltage high Wiring, H02S
P1153 Heated oxygen sensor (H02S) 1, bank 2insufficient switching Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1154 Heated oxygen sensor (H02S) 1, bank 2 slow response Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1171 Fuel system -lean during acceleration Fuel filter, fuel pump, H02S, injectors
P1172 Fuel level sensors, primary & secondary sensor no fuel level change during fuel transfer from secondary to primary tank Wiring, secondary fuel pump/relay, fuel level sensors
P1174 Heated oxygen sensor (H02S) 1, bank 1 mixture variation between cylinders Intake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1175 Heated oxygen sensor (H02S) 1, bank 2 mixture variation between cylinders Intake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1191 Intake manifold system -air leak Intake hose pipe connections, EGR system, ECM
P1200 – P1299 (Fuel and air metering – injector circuit)
P1214 Fuel injection pump timing -out of range Fuel injection pump timing incorrectly set, CKP sensor, ECM
P1216 Fuel injection duration -pulse width signal shorter than expected Wiring, fuel injection duration control solenoid, fuel injection pump control module, ECM
P1217 Fuel injection duration -pulse width signal longerthan expected Wiring, fuel injection duration control solenoid, fuel injection pump control module, ECM
P1218 Fuel injection pump calibration resistor-circuit malfunction Wiring, calibration resistor
P1220 Throttle motor position sensor 1 -circuit malfunction Wiring, throttle control module
P1221 Fuel pump, run signal -circuit malfunction
Throttle motor position sensor 2 -circuit malfunction
Wiring, engine oil pressure switch, fuel pump relay Wiring, throttle control module
P1222 Fuel pump, run signal:”” circuit malfunction Wiring, engine oil pressure switch, fuel pump relay
P1223 Injector 1 -circuit malfunction Wiring, injector, FICM
P1224 Injector 1 -circuit malfunction Wiring, injector, ECM
P1226 Injector 2 -circuit malfunction Wiring, injector, FICM
P1227 Injector 2 -circuit malfunction Wiring, injector, ECM
P1229 Injector 3 -circuit malfunction Wiring, injector, FICM
P122A Injector 3 -circuit malfunction Wiring, injector, ECM
P1232 Injector 4 -circuit malfunction Wiring, injector, FICM
P1233 Injector 4 -circuit malfunction Wiring, injector, ECM
P1235 Injector 5 -circuit malfunction Wiring, injector, FICM
P1236 Injector 5 -circuit malfunction Wiring, injector, ECM
P1238 Injector 6 -circuit malfunction Wiring, injector, FICM
P1239 Injector 6 -circuit malfunction Wiring, injector, ECM
P1241 Injector 7 -circuit malfunction Wiring, injector, FICM
P1242 Injector 7 -circuit malfunction Wiring, injector, ECM
P1244 Injector 8 -circuit malfunction Wiring, injector, FICM
P1247 Injector 8 -circuit malfunction Wiring, injector, ECM
P1255 Fuel pump control module -driver over-temperature Fuel pump control module
P1258 Engine overheating Cooling system, ECT sensor
P1261 Injectors 1, 4, 6 & 7 -high voltage Wiring, injector(s), ECM
P1262 Injectors 2, 3, 5 & 8 -high voltage Wiring, injector(s), ECM
P1270 Engine control module (ECM). APP sensor signal -analogue/digital process malfunction Engine control module (ECM)
P1271 Accelerator pedal position (APP) sensor 1/2 signal variation Wiring, APP sensor, ECM
P1272 Accelerator pedal position (APP) sensor 2/3signal variation Wiring, APP sensor, ECM
P1273 Accelerator pedal position (APP) sensor 1/3signal variation Wiring, APP sensor, ECM
P1275 Accelerator pedal position (APP) sensor 1 circuitmalfunction Wiring, APP sensor, ECM
P1276 Accelerator pedal position (APP) sensor 1 range performance Wiring, APP sensor, ECM
P1277 Accelerator pedal position (APP) sensor 1voltage low Wiring, APP sensor, ECM
P1278 Accelerator pedal position (APP) sensor 1 voltage high Wiring, APP sensor, ECM
P1280 Accelerator pedal pOSition (APP) sensor 2 circuit malfunction Wiring, APP sensor, ECM
P1281 Accelerator pedal position (APP) sensor 2 range performance Wiring, APP sensor, ECM
P1282 Accelerator pedal position (APP) sensor 2 voltage low Wiring, APP sensor, ECM
P1283 Accelerator pedal position (APP) sensor 2 voltage high Wiring, APP sensor, ECM
P1285 Accelerator pedal position (APP) sensor 3 circuit malfunction Wiring, APP sensor, ECM
P1286 Accelerator pedal position (APP) sensor 3 range performance Wiring, APP sensor, ECM
P1287 Accelerator pedal position (APP) sensor 3 voltage low Wiring, APP sensor, ECM
P1288 Accelerator pedal position (APP) sensor 3 voltage high Wiring, APP sensor, ECM
P1293 Injector control module -circuit malfunction bank 1 Injector control module
P1294 Injector control module -circuit malfunction bank 2 Injector control module
P1295 Injector control module -circuit malfunction bank 1 Injector control module
P1296 Injector control module -circuit malfunction bank 2 Injector control module
P1300 – P1399 (Ignition system or misfire)
P1336 Crankshaft position (CKP) sensor -variation not leamed Learning procedure not performed
P1345 Crankshaft position (CKP) sensor/camshaftposition (CMP) sensor -signal variation Wiring, CKP sensor, CMP sensor
P1351 Ignition control system, coil -voltage high Wiring open circuit, ICM, ECM
P1361 Ignition control system, IC circuit -voltage low Wiring, circuit short circuit to ground, poor connections, ICM, ECM
P1380 Antilock brake system (ABS)/traction controlsystem (TCS), rough road signal to ECM -malfunction ABSfTCS trouble code(s) stored
P1381 Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM -nocommunication Wiring, poor connections, ABSfTCS
P1400 – P1499 (Emission control)
P1400 Cold start emission control -malfunction Intake/exhaust leak/blockage, mechanical fault, idle speed control (ISC) system, ignition control, engine coolant temperature (ECT) sensor, H02S
P1404 Exhaust gas recirculation (EGR) valve -not fully closing Wiring, poor connections, EGR valve position sensor, EGR solenoid
P1406 Exhaust gas recirculation (EGR) valve position sensor range performance Wiring, EGR valve tight/sticking, EGR valve position sensor
P1409 Exhaust gas recirculation (EGR) systemmalfunction Wiring, vacuum pipes, EGR vacuum sensor, EGR valve
P1415 Secondary air injection (AIR) system, bank 1 Wiring, hoses blocked/leaking. AIR valve
P1416 Secondary air injection (AIR) system, bank 2 Wiring. hoses blockedfleaking, AIR valve
P1431 Fuel level sensor, secondary -circuit malfunction Wiring, fuel level sensor
P1432 Fuel level sensor -low voltage Wiring open circuit, fuel level sensor
P1433 Fuel level sensor -high voltage Wiring short circuit to positive, fuel level sensor
P1441 Evaporative emission (EVAP) system -leakdetected Hose connection(s), EVAP canister, EVAP canister purge valve
P1442 Evaporative emission (EVAP) system vacuum switch -circuit malfunction Hoses blockedfleaking, wiring, EVAP canister, ECM
P1481 Engine coolant fan speed sensor -signal loss Wiring, engine coolant fan speed sensor
P1482 Engine coolant fan clutch solenoid -circuit malfunction Wiring, engine coolant fan clutch solenoid, engine coolant fan clutch solenoid relay
P1484 Engine coolant fan speed/engine speed -signal variation Wiring, engine coolant fan clutch, engine coolant fan speed sensor
P1500 – P1599 (Vehicle or idle speed control)
P1504 Engine control module (ECM), vehicle speed sensor (VSS) output signal -circuit malfunction Wiring, poor connections, ASS, ECM
P1508 Idle air control (lAC) valve -low rpm Wiring open circuit/short circuit to ground/short circuit to positive, lAC valve, throttle valve tight/sticking
P1509 Idle air control (lAC) valve -high rpm Wiring open circuit/short circuit to ground/short circuit to positive, lAC valve, throttle valve tight/sticking
P1512 Throttle command/actual throttle position -signals out of range Wiring, throttle valve sticking, throttle control module
P1514 Throttle control unit, intake air flow -excessive Throttle control unit, MAP sensor, CMP sensor signal, ECM
P1515 Throttle command/actual throttle position -signal variation Wiring, throttle valve sticking, throttle control module
P1516 Throttle command/actual throttle position -signal variation Wiring, throttle valve sticking, throttle control module
P1517 Throttle control module -malfunction Throttle control module
P1518 Throttle control module/engine control module (ECM) -communication malfunction Wiring, throttle control module, ECM
P1520 Park/neutral position (PNP) switch -circuit malfunction Wiring short circuit to ground, PNP switch incorrectly adjusted
P1523 Throttle control unit, throttle position during battery saving mode Throttle valve movement restricted, throttle control unit, ECM
P154A Intake air heater -feedback circuit Wiring, glow plug control module, intake air heater
P154B Intake air heater -voltage signal circuit Wiring, glow plug control module, intake air heater
P154C Intake air heater -current signal circuit Wiring, glow plug control module, intake air heater
P154D Intake air heater -temperature signal circuit Wiring, glow plug control module, intake air heater
P1550 System voltage low Wiring, battery, alternator
P1571 Traction control system (TCS), torque request signal -malfunction Wiring, poor connections, ABSITCS
P1574 Brake pedal position (BPP) switch, voltage high Wiring, ABS
P1600 – P1699 (ECM – computer output circuit)
P1600 Engine control module (ECM) -malfunction ECM
P1601 CAN data bus, engine control module (ECM)/ anti lock brake system (ABS)/traction control system (TCS)/instrumentation control module/ diagnostic control module some communication lost Wiring, poor connections, ECM, ABSITCS,diagnostic control module, instrumentation control module
P1602 Engine control module (ECM) to antilock brake system (ABS)/traction control system (TCS), CAN data bus -communication failure Wiring, poor connections, ABS control module
P1621 Engine control module (ECM) -memory performance ECM
P1626 Engine control module (ECM) -fuel enable signal lost Wiring, poor connections, immobilizer control module, ECM
P1627 Engine control module (ECM) -malfunction ECM
P1630 Engine control module (ECM), immobilizer code -leaming mode ECM immobilizer code programming not completed
P1631 Engine control module (ECM) -incorrect immobilizer code
System voltage low
Engine control module (ECM) -fuel disable signal received
Incorrect key, immobilizer code not programmed Wiring, battery, alternator Fuses, BCM, immobilizer code
P1633 Engine control module (ECM ), ignition supply voltage Fuse, wiring open circuit, ECM
P1634 Engine control module (ECM) -ignition supply voltage -voltage low Wiring open circuit, ECM
P1635 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, TP sensor, MAP sensor, EGR valve position sensor, ECM
P1637 Alternator warning lamp, control signal -circuit malfunction Wiring, instrument panel, ECM
P1638 Alternator ‘F’ terminal -circu it malfunction Wiring open circuit/short circuit to ground,alternator, ECM
P1639 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, FTP sensor, ECM
P1641 Malfunction indicator lamp (MIL) -circuitmalfunction Wiring, fuses, MIL
P1643 Glow plug waming lamp -circuit malfunction Wiring, glow plug warning lamp, ECM
P1644 Traction control system (TCS), delivered torque signal -malfunction Wiring, poor connections, ECM
P1653 Exhaust gas recirculation (EGR) vent valve circuit malfunction Wiring, poor connections, EGR vent valve, ECM
P1654 Service throttle soon warning lamp -circuit malfunction Wiring, fuses, service throttle soon warning lamp
P1655 Exhaust gas recirculation (EGR) control valve -circuit malfunction Wiring, poor connections, EGR control valve,ECM
P1656 Turbocharger (TC) wastegate regulating valve -circuit malfunction Wiring, TC wastegate regulating valve, ECM
P1658 Fuel injector control module (FICM) malfunction FICM
P1665 Fuel level sensor -signal malfunction Wiring short circuit to positive, fuel level sensor
P1668 Alternator ‘l’ terminal -circuit malfunction Wiring, voltage regulator, alternator, ECM
P1680 Engine control module (ECM) -malfunction ECM
P1681 Engine control module (ECM) -malfunction ECM
P1682 Engine control module (ECM) -ignition powersupply less than 10 V Wiring, ECM
P1683 Engine control module (ECM) -malfunction ECM
P1687 Fuel injector control module (FICM) -stuck on ECM, FICM
P1688 Engine control module (ECM), torque reduction signal -out of range Wiring TCM, ECM
P1689 Traction control system (TCS), delivered torquesignal -malfunction Wiring, poor connections, ECM
P16F3 Engine control module -redundant memoryperformance Wiring, ECM
P1700 – P1799 (Transmission)
P1779 Engine control module (ECM), torque reduction signal -out of range Wiring TCM, ECM
P1781 Transmission control module (TCM), MIL requestsignal -voltage high/low Wiring TCM, ECM
P1800 – P1899 (Transmission)
P1810 Transmission gear pressure switch, signal -circuit malfunction Wiring open circuit/short circuit to ground,reverse/D1/D2/D3/D4 gear pressure switch(es), ECM
P1811 Shift time too long -adaptation limit reached Fluid level low, transmission mechanical fault
P1812 Transmission fluid temperature (TFT) high Transmission mechanical fault, towing weight limit exceeded
P1815 Transmission fluid pressure (TFP) switch -invalid gear selection Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECMITCM
P1816 Transmission fluid pressure (TFP) switch -invalid gear selection Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECMITCM
P1860 Torque converter clutch (TCC) solenoid, pulsewidth modulation (PWM) -circuit malfunction Wiring open circuit/short circuit to ground, TCC solenoid, ECM
P1864 Torque converter clutch (TCC) solenoid -circuit malfunction Wiring open circuit/short circuit to ground, TCC solenoid, ECM
P1870 Torque converter clutch (TCC) -slip speed excessive Transmission fluid level, wiring, TCC solenoid, ECM
P1875 Transmission, 4WD low selection signal -circuit malfunction Wiring, transmission, four wheel drive control module, ECM
P1886 Transmission 3rd-2nd control solenoid -circuitmalfunction Wiring, control solenoid, ECM
P3400 Cylinder cut-out system -malfunction Wiring, intake system leaking, mechanical fault, MAF sensor, MAP sensor, TP sensor, ECM
P3401 Cylinder cut-out solenoid, cylinder 1 malfunction Wiring, cylinder cut-out solenoid, mechanical fault, ECM
P3425 Cylinder cut-out solenoid , cylinder 4 malfunction Wiring, cylinder cut-out solenoid, mechanical fault, ECM
P3441 Cylinder cut-out solenoid, cylinder 6 malfunction Wiring, cylinder cut-out solenoid, mechanical fault, ECM
P3449 Cylinder cut-out solenoid, cylinder 7 malfunction Wiring, cylinder cut-out solenoid, mechanical fault,ECM
U1000 – U2000 (Manufacturer defined, common defination listed)
U1026 Transmission control module (TCM)/four wheeldrive control module, CAN data bus -communication malfunction Wiring, BCM
U1041 Antilock brake system (ABS)/traction controlsystem (TCS), CAN data bus -communicationmalfunction Wiring, ABSITCS control module
U1064 Body control module (BCM)/immobilizer controlmodule, CAN data bus -communication malfunction Wiring, BCM, immobilizer control module
U1192 Engine control module (ECM)limmobilizer control module, CAN data bus -signal malfunction Wiring, immobilizer control module, ECM
U1193 Engine control module (ECM)limmobilizer control module, CAN data bus -signal malfunction Wiring, immobilizer control module, ECM
U1800 Engine control module (ECM)/fuel injector control module (FICM), CAN data bus -communication malfunction Wiring, FICM, ECM
U2104 Engine control module (ECM)/transmission control module (TCM)/Fuel injector control module (FICM), CAN data bus communication malfunction Wiring, TCM, FICM, ECM

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What is the GMC Trouble Codes List?

GMC trouble codes, also known as Diagnostic Trouble Codes (DTCs), are alphanumeric codes generated by your vehicle’s onboard computer (ECU) to indicate a problem with one of the vehicle’s systems. These codes serve as a valuable diagnostic tool, helping mechanics and vehicle owners identify issues and perform the necessary repairs.

Common Reasons for GMC Trouble Codes

GMC trouble codes can be triggered by various issues, including:

  • Faulty Sensors: Malfunctioning sensors can lead to incorrect data, triggering trouble codes.
  • Emissions Problems: Issues with the vehicle’s emissions system can result in trouble codes related to the exhaust or catalytic converter.
  • Engine Problems: Engine-related trouble codes often point to issues with fuel delivery, ignition, or other critical components.
  • Transmission Issues: Transmission trouble codes indicate problems with gear shifting or fluid levels.
  • Electrical Problems: Faulty wiring or electrical components can lead to trouble codes related to the vehicle’s electrical system.

Diagnosing GMC Trouble Codes List

If your GMC vehicle’s check engine light illuminates, it’s essential to diagnose the trouble codes promptly. Here’s a step-by-step guide on how to do it:

  1. Check for Warning Lights: When your check engine light comes on, it’s a clear indication of a problem. Don’t ignore it.
  2. Use a Diagnostic Scanner: Invest in an OBD-II (On-Board Diagnostics) scanner to read trouble codes. Plug it into your vehicle’s OBD-II port, usually located under the dashboard near the steering column.
  3. Read the Codes: The scanner will display alphanumeric codes. Write down these codes, as they are crucial for diagnosing the issue.
  4. Consult a Trouble Code Guide: Refer to your vehicle’s manual or an online trouble code guide to interpret the codes. Each code corresponds to a specific problem or system.
  5. Address the Issue: Once you’ve identified the problem, take appropriate action. Depending on the severity, you may need to consult a mechanic or perform the repairs yourself.

Understanding GMC Trouble Code Formats

GMC trouble codes follow a specific format, usually starting with a letter, followed by numbers. Here’s a breakdown:

  • P0XXX: Powertrain codes (engine and transmission).
  • C0XXX: Chassis codes (brakes, steering, and suspension).
  • B0XXX: Body codes (airbags, climate control, and other body-related systems).
  • U0XXX: Network communication codes (issues with the vehicle’s communication network).

Each element of the code provides information about the issue. For example, a P0300 code indicates a random misfire in the engine.

Interpreting Specific GMC Trouble Codes

While there are numerous GMC trouble codes, some are more common than others. Here are a few examples:

  • P0420: Catalytic Converter Efficiency Below Threshold
  • P0300: Random/Multiple Cylinder Misfire Detected
  • C0561: ABS System Disabled Information Stored
  • B0012: Driver Frontal Deployment Loop Stage 1

Understanding the specific code affecting your vehicle is crucial for accurate diagnosis and repair.

Importance of Timely Troubleshooting

Ignoring or delaying the resolution of GMC trouble codes can lead to more significant problems and potentially costly repairs. Addressing issues promptly can prevent further damage and improve your vehicle’s overall performance and fuel efficiency.

Clearing GMC Trouble Codes

Once you’ve identified and resolved the issue causing the trouble code, you can clear the code from your vehicle’s ECU. This is typically done using the OBD-II scanner:

  1. Connect the Scanner: Plug the scanner back in and navigate to the option to clear trouble codes.
  2. Clear the Codes: Follow the scanner’s prompts to clear the trouble codes from the ECU.
  3. Verify the Repair: After clearing the codes, drive your vehicle and ensure that the check engine light remains off. This confirms that the issue has been successfully addressed.

Preventing GMC Trouble Codes

While some trouble codes are inevitable, you can take steps to prevent them and ensure your GMC vehicle runs smoothly:

  • Regular Maintenance: Schedule routine maintenance to keep your vehicle in top condition.
  • Address Warning Signs: Don’t ignore warning signs like unusual noises or performance issues.
  • Use Quality Parts: When replacing components, use high-quality, OEM (Original Equipment Manufacturer) parts.
  • Avoid Neglect: Neglecting maintenance can lead to trouble codes and more significant problems down the road.
  • Seek Professional Help: If you’re unsure about diagnosing or repairing trouble codes, consult a qualified mechanic.

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Addressing Heavy Machinery Challenges and GMC Equipment Fault Codes

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What truly sets 30 Min DPF Clean apart is our comprehensive approach to machinery maintenance. We don’t limit ourselves to DPF cleaning; our expertise extends to a wide range of services, including Exhaust Gas Recirculation (EGR), Selective Catalytic Reduction (SCR), Diesel Oxidation Catalyst (DOC), and Catalytic Converter cleaning. By harnessing cutting-edge technology, we guarantee seamless machinery operation, effectively reducing the occurrence of troublesome fault codes.

Quality Cleaning for Peak Performance

At 30 Min DPF Clean, we understand that a clean machine is a reliable machine. That’s why we go the extra mile to eliminate ash, soot, and other residues from your diesel engines. Our exceptional DPF Cleaning service ensures the optimal performance of your machinery, offering you peace of mind while keeping those fault codes at bay.

Competitive Prices, Exceptional Service

In the grand scheme of things, 30 Min DPF Clean provides top-tier service without straining your budget. Our competitive pricing model, combined with outstanding DPF cleaning services, makes us the ideal choice for those seeking to extend the lifespan of their GMC machinery. So, when your equipment starts communicating through fault codes, consider reaching out to 30 Min DPF Clean. Our skilled technicians excel at addressing various issues, helping you decipher the GMC Fault Codes List and swiftly restoring your machinery to its prime condition. Remember, in machinery maintenance, it’s not just about fixing problems—it’s about preventing them. And 30 Min DPF Clean is your trusted partner on that journey.


Understanding GMC trouble codes is essential for any GMC vehicle owner. They serve as valuable indicators of underlying issues and help you maintain your vehicle’s performance. By promptly addressing trouble codes and following a regular maintenance schedule, you can keep your GMC vehicle running smoothly for years to come.

FAQs About GMC Trouble Codes

  1. What should I do if my check engine light comes on?
    • When your check engine light comes on, it’s crucial to diagnose the issue by reading the trouble codes using an OBD-II scanner. Once you have the codes, you can determine the problem and take appropriate action.
  2. Can I ignore GMC trouble codes if my vehicle seems to be running fine?
    • Ignoring trouble codes, even if your vehicle appears to run fine, is not recommended. These codes often indicate underlying issues that, if left unaddressed, can lead to more significant problems and costly repairs.
  3. Do I need a mechanic to clear trouble codes, or can I do it myself?
    • You can clear trouble codes yourself using an OBD-II scanner. However, it’s essential to ensure that the underlying issue causing the trouble code has been resolved before clearing the code.
  4. Are there ways to prevent GMC trouble codes?
    • While some trouble codes may be inevitable, you can prevent many by adhering to a regular maintenance schedule, addressing warning signs promptly, using quality parts, and seeking professional help when needed.
  5. What if I can’t find my vehicle’s trouble code in the owner’s manual or online guides?
    • If you encounter a trouble code that you can’t find in the owner’s manual or online guides, it’s advisable to consult a qualified mechanic. They can provide a more accurate diagnosis and recommend the necessary repairs.

gmc fault codes list

For more information on GMC trouble codes and related services, visit the official GMC website.