mercedes fault codes list


When it comes to automotive diagnostics, fault codes play a crucial role in identifying and troubleshooting issues within a vehicle’s systems. Mercedes-Benz, renowned for its luxury and performance, utilizes a comprehensive fault code system to assist mechanics and technicians in diagnosing problems effectively. In this article, we will delve into the world of Mercedes fault codes list, providing you with a comprehensive list of common codes and their meanings.

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Mercedes-Benz Codes
Trouble Code Fault Location Probable Cause
P0325 Knock sensor (KS) 1 , bank 1 -circuit malfunction Wiring, poor connection, KS
P1000 – P1099 (Fuel and air metering and auxiliary emission control)
P1000 Transmission shift lever control module- defective Transmission shift lever control module
P1031 Heated oxygen sensor (H02S) 1 – malfunction Wiring, connector, H02S
P1100 – P1199 (Fuel and air metering)
P1131 Heated oxygen sensor (H02S) 1 – signal/ electrical fault Wiring, H02S
P1132 Heated oxygen sensor (H02S) control 1 – system too rich Intake/exhaust leak, H02S
P1137 Heated oxygen sensor (H02S) 2 – signal/ electrical fault Wiring, H02S
P1138 Heated oxygen sensor (H02S) 2 – range/   performance problem Wiring, H02S
P1146 Mass air flow (MAF) sensor(s)- malfunction Wiring, intake leak, MAF sensor(s)
P1147 Engine coolant temperature (ECT) sensor(s)- malfunction Wiring, ECT sensor(s)
P1148 Intake air temperature (IAT) sensor(s)- malfunction Wiring, IAT sensor(s)
P1149 Manifold absolute pressure (MAP) sensor(s) – malfunction Wiring, hose(s), MAP sensor(s), ECM
P1162 Throttle position (TP) sensor(s)- malfunction Wiring, TP sensor(s)
P1163 Engine oil level switch – malfunction Wiring, engine oil level switch, ECM
P1170 Short term fuel trim (FT) – malfunction Intake/exhaust leak, injector(s), fuel pressure, MAF sensor
P1177 Engine oil sensor, quality/level/temperature – malfunction Wiring, engine oil sensor
P1178 Engine oil sensor, level – implausible signal Wiring, oil level, engine oil sensor
P1179 Engine oil sensor, quality – implausible signal Wiring, engine oil sensor
P1180 Engine oil sensor, temperature too high Wiring, engine oil sensor
P1181 Engine coolant blower motor!NC condenser blower motor – malfunction Wiring, engine coolant blower motor/AIC   condenser blower motor, ECM
P1182 Starter motor relay – defective Wiring, starter motor relay, ignition switch, ECM
P1183 Cylinder cut-out solenoid, bank 1 -defective Wiring, cylinder cut-out solenoid
P1184 Cylinder cut-out solenoid, bank 2 – defective Wiring, cylinder cut-out solenoid
P1185 Engine oil sensor, quality – water in oil Engine oil
P1186 Fuel shut-off- recognised Wiring, cruise control actuator, mechanical fault, ECM
P1200 – P1299 (Fuel and air metering – injector circuit)
P1225 Intake manifold air control solenoid – malfunction Wiring, intake manifold air control solenoid, ECM
P1233 Throttle actuator- mechanical fault Throttle actuator tight/sticking
P1235 Supercharger (SC) pressure – incorrect Supercharger (SC) bypass valve motor sticking, intake leak/blockage, SC, ECM
P1236 Supercharger (SC) clutch – malfunction Wiring, SC clutch, ECM
P1300 – P1399 (Ignition system or misfire)
P1300 Crankshaft position (CKP) sensor(s) – malfunction Wiring, flywheel ring gear damaged, CKP   sensor(s)
P1335 Engine speed (RPM) sensor – signal Wiring, ECM
P1336 Crankshaft position (CKP) sensor – signal Wiring, air gap, flywheel ring gear damaged, CKP sensor
P1337 Engine control module (ECM), RPM signal – output Wiring, RPM sensor, ECM
P1340 Camshaft position (CMP) sensor – signal Wiring, CMP sensor, ECM
P1341 Camshaft position (CMP) actuator- mechanical fault Camshaft timing mechanism, CMP actuator
P1342 Camshaft position (CMP) actuator- electrical fault Wiring, connector, CMP actuator, ECM
P1355 Cylinder cut-out solenoid, bank 1 -solenoid stuck open Wiring, cylinder cut-out solenoid
P1356 Cylinder cut-out solenoid, bank 2 -solenoid stuck open Wiring, cylinder cut-out solenoid
P1357 Cylinder cut-out system ON, cylinder 2, 3, 5 or 8 – inlet valve still opening Mechanical fault
P1358 Cylinder cut-out system OFF, cylinder 5 -exhaust valve not opening Mechanical fault
P1359 Cylinder cut-out system OFF, cylinder 2 -exhaust valve not opening Mechanical fault
P1360 Cylinder cut-out system OFF, cylinder 3 -exhaust valve not opening Mechanical fault
P1361 Cylinder cut-out system OFF, cylinder 8 -exhaust valve not opening Mechanical fault
P1366 Cylinder cut-out system, throttle switch-over valve – malfunction Wiring, throttle switch-over valve
P1380 Cylinder cut-out system OFF -one inlet valve of a cylinder is not opening Mechanical fault
P1384 Knock sensor (KS) 1, bank 2 – malfunction Wiring, KS
P1385 Knock sensor (KS) 2, bank 2 – malfunction Wiring, KS
P1386 Engine control module (ECM). knock control – defective Fuel contamination, mechanical fault, ECM
P1397 Camshaft position (CMP) sensor(s)- malfunction Wiring, CMP sensor(s)
P1400 – P1499 (Emission control)
P1400 Exhaust gas recirculation (EGR) solenoid -circuit malfunction Wiring, EGR solenoid, hose(s), ECM
P1402 Exhaust Gas Recirculation Open-Loop Control
P1411 Secondary air injection (AIR) system – malfunction Wiring, connector, hoses, AIR pump, AIR solenoid
P1420 Secondary air injection (AIR) valve/solenoid – defective Wiring, fuse, AIR valve/solenoid, ECM
P1437 Catalytic converter temperature sensor, bank 1 – defective Wiring, catalytic converter temperature sensor, ECM
P1443 Evaporative emission (EVAP) canister purge valve(s)- defective Wiring, hoses, EVAP canister purge valve(s)
P1444 Catalytic converter temperature sensor, bank 2 – defective Wiring, catalytic converter temperature sensor, ECM
P1453 Secondary air injection (AIR} pump relay- defective Wiring, fuse, AIR pump relay, ECM
P1463 Secondary air injection (AIR) system- defective Wiring, hoses, AIR pump relay, AIR valve/   solenoid
P1470 Boost Charge Control Solenoid
P1490 Evaporative emission (EVAP) canister purge valve(s)- defective Wiring, hoses, EVAP canister purge valve(s)
P1491 AIC system – pressure too high AIC control module trouble code(s) stored
P1500 – P1599 (Vehicle or idle speed control)
P1519 Camshaft position (CMP) control, bank 1 – mechanical fault Camshaft position control system
P1522 Camshaft position (CMP) control, bank 2 – mechanical fault Camshaft position control system
P1525 Camshaft position (CMP) actuator, bank 1 – defective Wiring, CMP actuator, ECM
P1533 Camshaft position (CMP) actuator, bank 2 – defective Wiring, CMP actuator, ECM
P1542 Accelerator pedal position (APP) sensor – signal Wiring, APP sensor, ECM
P1550 AIC compressor torque – implausible signal AIC trouble code(s) stored
P1551 AIC compressor clutch cut-off Wiring, incorrect AIC control module, ECM
P1570 Ignition switch control module/ECM – attempted theft/data bus/not compatible Wiring, trouble code(s) stored in other system(s), ignition switch control module, ECM
P1580 Throttle motor, bank 1, TPM/ISC – circuit malfunction Wiring, throttle motor, ECM
P1581 Throttle motor, bank 2, TPM/ISC – circuit malfunction Wiring, throttle motor, ECM
P1584 Brake pedal position (BPP) switch – malfunction Wiring, BPP switch, trouble code(s) stored in other system(s)
P1587 Engine control module (ECM), bank 1 & 2 – supply voltage Wiring, connectors, ECM
P1588 CAN data bus, central locking control module -·   malfunction Wiring
P1589 Engine control module (ECM), bank 2, knock control – defective Fuel contamination, mechanical fault, ECM
P1600 – P1699 (ECM – computer output circuit)
P1603 CAN data bus, ignition switch control module – malfunction Wiring
P1605 Acceleration sensor,” ESP/ASR system -rough road signal, comparison of wheel speeds Trouble code(s) stored in other system(s)
P1632 Engine control module (ECM), bank 2 – internal fault ECM
P1641 Engine control module (ECM), bank 1 & 2 – TP   signal Wiring, ECM
P1642 Engine control module (ECM) – incorrectly coded ECM coded for MT with AT fitted
P1643 Engine control module (ECM) – incorrectly coded/   data bus ECM coded for AT with MT fitted, wiring
P1644 Transmission control module (TCM) – supply voltage low Wiring, TCM trouble code(s) stored
P1666 Cylinder cut-out solenoid, bank 1 or 2 – does not open Wiring, cylinder cut-out solenoid
P1681 Engine control module (ECM), crash signal – plausibility Wiring, connectors, SRS control module trouble code(s) stored, ECM
P1700 – P1799 (Transmission)
P1700 Transmission shift control – malfunction Wiring, transmission shift control valve, TCM trouble code{s) stored
P1701 Transmission shift control valve – electrical fault Wiring, transmission shift control valve
P1711 Intake manifold air control solenoid – malfunction Wiring, connectors, intake manifold air control solenoid, ECM
P1740 Engine control module (ECM), load signal – plausibility Wiring, electronic throttle system (ETS), MAF sensor, TP sensor, ECM
P1741 Throttle position (TP) sensor, load signal – plausibility Wiring, electronic throttle system (ETS), MAF sensor, TP sensor, ECM
P1747 CAN data bus, TCM/instrument panel – malfunction Wiring, trouble code(s) stored in other system(s)
P1750 Transmission shift lever control module – supply voltage low . Wiring, multifunction control module, transmission shift lever control module
P1800 – P1899 (Transmission)
P1817 Reverse lamps – open/short circuit Wiring short to ground/positive, supply voltage open circuit, reverse lamps switch
P1832 Transmission shift lever control module – short circuit Wiring, connector, transmission shift lever control module
P1833 Transmission shift lever control module – open circuit Wiring, connector, transmission shift lever control module
P1856 Transmission shift lever recognition – malfunction Transmission shift lever control module
P1860 CAN data bus, VSS signal, rear axle – malfunction Wiring, trouble code(s) stored in other system(s)
P1861 CAN data bus, VSS signal, rear axle – malfunction Wiring, trouble code(s) stored in other system(s)
P1875 CAN data bus, transmission shift lever control module – malfunction Wiring, transmission shift lever control module
P1876 CAN data bus, VSS signal – malfunction Wiring, trouble code(s) stored in other system(s), electronic traction control (ETC) module
P1893 Travel Control Shock Absorber Module
P1900 – P1999 (Transmission)
P1904 CAN data bus, TCM/instrument panel – malfunction Wiring, trouble code(s) stored in other system(s)
P1906 CAN data bus, stop lamp switch – malfunction Wiring, trouble code(s) stored in other system(s), electronic ignition switch
P1910 Transmission shift lever control module- supply voltage high Wiring, multifunction control module, transmission shift lever control module
P1911 Transmission shift lever illumination – open circuit Transmission shift lever control module
P1912 Transmission shift lever control module, range switch – implausible signal Stored trouble code(s), transmission shift lever control module
P1925 Transmission shift lever control module, immobilizer signal – plausibility Wiring, trouble code(s) stored in other system(s), electronic ignition switch, transmission shift lever control module

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Understanding Mercedes Fault Codes List

Fault codes, also known as Diagnostic Trouble Codes (DTCs), are alphanumeric codes that provide information about specific issues or malfunctions detected by a vehicle’s onboard diagnostic system. These codes serve as a starting point for diagnosing problems and can be read using a diagnostic tool or scanner.

In the case of Mercedes-Benz vehicles, fault codes are categorized into various systems and components, including the engine, transmission, ABS (Anti-lock Braking System), airbags, and more. Each fault code consists of a letter, followed by four digits. The letter indicates the system where the fault code originates, while the digits provide further details about the specific problem.

Common Mercedes Fault Codes

P0016 – Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A

This fault code indicates a correlation issue between the crankshaft and camshaft positions in bank 1, sensor A. Possible causes include a faulty sensor, timing chain problems, or issues with the engine’s mechanical components.

P0172 – Fuel Trim Too Rich Bank 1

The P0172 fault code points to a rich air-fuel mixture in bank 1 of the engine. This can be caused by a malfunctioning oxygen sensor, a clogged fuel injector, or a problem with the engine’s fuel delivery system.

P0300 – Random/Multiple Cylinder Misfire Detected

When the engine experiences misfires in multiple cylinders or randomly, the P0300 fault code is triggered. Potential causes include ignition system problems, fuel delivery issues, or vacuum leaks within the intake manifold.

B1040 – Rear Right Seatbelt Tensioner Deployment Control (Tensioner Limitation 1st Stage)

This fault code relates to the rear right seatbelt tensioner deployment control, specifically its limitation in the first stage. It suggests a malfunction in the seatbelt tensioning system, which may require inspection and potential replacement of the affected components.

Diagnosing and Resolving Mercedes Fault Codes

Diagnosing and resolving Mercedes fault codes requires a combination of technical expertise and the use of specialized diagnostic equipment. Here are some general steps to follow:

  1. Code Reading: Use a diagnostic scanner to retrieve the fault codes from the vehicle’s onboard computer.
  2. Code Interpretation: Refer to the Mercedes fault code database or documentation to identify the specific code and its meaning.
  3. Component Inspection: Perform a thorough inspection of the system or component associated with the fault code. This may involve visual checks, wiring inspections, or testing of various sensors and actuators.
  4. Repair or Replacement: Based on the inspection results, repair or replace the faulty component as necessary. Follow the manufacturer’s guidelines and use genuine Mercedes parts for optimal performance and reliability.
  5. Code Clearing: After resolving the issue, use the diagnostic scanner to clear the fault codes from the system’s memory.

Remember, it is advisable to seek professional assistance if you are not confident in diagnosing or resolving Mercedes fault codes on your own. Certified technicians have the necessary expertise and equipment to ensure accurate diagnosis and proper repairs.

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Understanding Mercedes fault codes is crucial for effective vehicle diagnosis and troubleshooting. By familiarizing yourself with common fault codes and their meanings, you can have a better understanding of the potential issues that may arise in your Mercedes-Benz. Remember to consult with professionals for accurate diagnosis and resolution of complex problems.


Are Mercedes fault codes universal?

No, fault codes are not universal and can vary across different vehicle manufacturers. It’s important to consult Mercedes-specific fault code documentation for accurate interpretation.

Can I drive my Mercedes with a fault code?

It is generally not recommended to drive your vehicle with unresolved fault codes, especially if they indicate critical issues. Continued driving may worsen the problem and potentially cause further damage.

Can I clear fault codes myself?

Yes, you can clear fault codes using a diagnostic scanner. However, it is essential to address the underlying issue causing the fault code before clearing it.

How often should I check for fault codes in my Mercedes?

It is advisable to periodically check for fault codes, especially if you notice any abnormal behavior or warning lights on your Mercedes. Regular maintenance and inspections can help prevent potential problems.

Where can I find a reliable Mercedes fault code scanner?

Reliable Mercedes fault code scanners can be purchased from authorized dealers, reputable automotive tool suppliers, or online marketplaces. Ensure compatibility with your vehicle’s make and model.

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For more information on Mercedes-Benz equipment and related services, visit the official Mercedes-Benz website.