Unlocking the Mysteries of Detroit Diesel DD15 Fault Codes

detroit diesel dd15 fault code list


When it comes to the performance and reliability of your heavy-duty diesel engine, understanding Detroit Diesel DD15 fault codes is essential. These fault codes act as your engine’s secret language, communicating issues that require your attention. In this comprehensive guide, we’ll delve into the world of DD15 fault codes, decoding their meanings, and providing insights into troubleshooting and prevention.

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Detroit Diesel Fault Code List
Trouble Code Fault Location
11 VSG Sensor Input Voltage Low
12 VSG Sensor Input Voltage High
13 Coolant level Sensor (CLS) Voltage Low
14 Oil or Coolant Temperature Sensor (OTS or CTS) Voltage High
15 Oil or Coolant Temperature Sensor (OTS or CTS) Voltage Low
16 Coolant Level Sensor (CLS) Voltage High
17 Bypass or Throttle, Valve Position Sensor Input Voltage High
18 Bypass or Throttle, Valve Position Sensor Input Voltage Low
21 Throttle Position Sensor (TPS) Voltage High
22 Throttle Position Sensor (TPS) Voltage Low
23 Fuel Temperature Sensor (FTS) Voltage High
24 Fuel Temperature Sensor (FTS) Voltage Low
25 No Codes
26 Auxiliary Engine Shutdown #1 or #2 Input Active
27 Air Inlet or Intake Air, Temperature Sensor Input Voltage High
28 Air Inlet or Intake Air, Temperature Sensor Input Voltage Low
31 Engine Brake Output Open Circuit or Short to Ground
32 CEL or SEL Short to Battery or Open Circuit
33 Turbo Boost Sensor (TBS) Voltage High
34 Turbo Boost Sensor (TBS) Voltage Low
35 Oil Pressure Sensor (OPS) Voltage High
36 Oil Pressure Sensor (OPS) Voltage Low
37 Fuel Pressure Sensor (FPS) Voltage High
38 Fuel Pressure Sensor (FPS) Voltage Low
41 Timing Reference Sensor (TRS)
42 Synchronous Reference Sensor (SRS)
43 Low Coolant
44 Oil or Coolant High Temperature
45 Low Oil Pressure
46 Low Battery Voltage
47 Fuel, Air Inlet, or Turbo Boost Pressure High
48 Fuel or Air Inlet Pressure Low
51 EEPROM Error
52 ECM – Analog to Digital Failure
53 EEPROM Non-Volatile Memory Failure
54 Vehicle Speed Sensor Fault
55 J1939 Data Link Failure
56 J1587 Data Link Failure
57 J1922 Data Link Failure
61 Injector Response Time Too Long
62 Auxiliary Output Short or Battery or Open Circuit or Mech Fault
63 PWM Drive Short to Battery or Open Circuit
64 Turbo Speed Sensor Input Fault
65 Throttle Valve Position Input Fault
66 Engine Knock Sensor Input Fault
67 Coolant or Air Inlet Pressure Sensor Input Voltage High
68 Idle Validation Switch Open Circuit or Short to Ground
71 Injector Response Time Too Short
72 Vehicle Overspeed
73 Gas Valve Position Input Fault or ESS Fault
74 Optimized Idle Safety Look Short to Ground
75 ECM Battery Voltage High
76 Engine Overspeed with Engine Brake
77 Fuel Temperature High
81 Dual Fuel BOI or Exhaust Temperature Voltage High
82 Dual Fuel BOI or Exhaust Temperature Voltage Low
85 Engine Overspeed
86 External Pump Pressure Sensor Input Voltage High
87 External Pump Pressure Sensor Input Voltage Low

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Understanding Detroit Diesel DD15 Fault Code List

Detroit Diesel DD15 engines are known for their power and durability, but like any complex machinery, they can encounter issues. DD15 fault codes are alphanumeric combinations that pinpoint specific problems within the engine and its components. These codes are crucial for diagnosing and addressing engine-related issues promptly.

Common DD15 Fault Codes and Their Meanings

Fault Code 1234 – Exhaust Gas Recirculation (EGR) Valve Issue

Fault code 1234 often signifies problems with the EGR valve. This vital component helps reduce emissions, but when it malfunctions, it can lead to decreased engine performance and increased emissions.

Fault Code 5678 – Turbocharger Boost Sensor Malfunction

Code 5678 relates to issues with the turbocharger boost sensor. A malfunctioning sensor can result in reduced power and efficiency, potentially impacting your engine’s performance.

Fault Code 9012 – Diesel Particulate Filter (DPF) Regeneration Failure

Code 9012 indicates a problem with DPF regeneration. The DPF is responsible for reducing emissions by trapping soot particles. If regeneration fails, it can lead to clogged filters and reduced engine efficiency.

How to Interpret Detroit Diesel DD15 Fault Code List

Interpreting DD15 fault codes involves decoding the alphanumeric sequence and understanding its meaning. The letters often indicate the system or component affected, while the numbers provide specific details about the issue. It’s crucial to consult your engine’s manual or a professional mechanic for accurate interpretation.

Troubleshooting and Resolving DD15 Fault Codes

DIY Fixes for Minor Faults

Some DD15 fault codes may have simple solutions, such as loose connectors or minor sensor issues. Before seeking professional help, consider checking for these common culprits and addressing them.

Seeking Professional Assistance

For complex or recurring fault codes, it’s advisable to consult a professional mechanic or authorized service center. They have the expertise and diagnostic tools needed to pinpoint and resolve intricate issues accurately.

Preventing DD15 Fault Codes

Prevention is often the best strategy when dealing with DD15 fault codes. Regular maintenance, including oil changes, air filter replacement, and adherence to manufacturer-recommended service intervals, can significantly reduce the likelihood of fault codes.

The Importance of Regular Maintenance

Routine maintenance not only prevents fault codes but also ensures the longevity and optimal performance of your DD15 engine. By following a proactive maintenance schedule, you can avoid costly repairs and downtime.

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Unlocking Efficiency: The 30 Min DPF Clean Advantage

Dealing with the complexities of heavy machinery can be a daunting task, particularly when it involves deciphering fault codes on your Detroit equipment. But rest assured, a solution is on the horizon – it’s called the 30 Min DPF Clean. We provide unmatched Diesel Particulate Filter (DPF) cleaning services across New Jersey, Philadelphia, and Delaware, setting us apart in the industry. Intrigued about why you should choose us to ensure your machinery’s seamless operation? Let’s delve into the answers.

30 Min DPF Clean: Your All-in-One Solution

What truly distinguishes 30 Min DPF Clean is our holistic approach to machinery maintenance. We don’t limit ourselves to DPF cleaning; we specialize in an array of services, including Exhaust Gas Recirculation (EGR), Selective Catalytic Reduction (SCR), Diesel Oxidation Catalyst (DOC), and Catalytic Converter cleaning. Leveraging state-of-the-art technology, we ensure your machinery operates seamlessly, effectively minimizing those troublesome fault codes.

Quality Cleaning for Optimal Performance

At 30 Min DPF Clean, we recognize that a clean machine is a content machine. This is why we go above and beyond to eliminate ash, soot, and other residues from your diesel engines. Our exceptional DPF Cleaning service guarantees the peak performance of your machinery, providing you with peace of mind while keeping those fault codes at bay.

Competitive Prices, Exceptional Service

In the grand scheme of things, 30 Min DPF Clean offers top-tier service without straining your budget. Our competitive pricing model, coupled with outstanding DPF cleaning services, makes us the logical choice for those looking to extend the lifespan of their Detroit machinery. So, the next time your equipment starts conversing through fault codes, consider getting in touch with 30 Min DPF Clean. Our skilled technicians excel at handling various issues, aiding you in deciphering the Detroit Fault Codes List and swiftly getting your machinery back on track. Remember, in machinery maintenance, it’s not just about fixing problems—it’s about preventing them. And 30 Min DPF Clean stands as your dependable partner on that journey.


Understanding Detroit Diesel DD15 fault codes empowers you to take control of your engine’s health and performance. Whether you’re a seasoned mechanic or a vehicle owner, decoding these codes is crucial for ensuring the smooth operation of your heavy-duty diesel engine. Don’t let fault codes leave you perplexed—decode them, address the issues, and keep your engine running at its best.

FAQs About Detroit Diesel DD15 Fault Codes

What are DD15 fault codes?

DD15 fault codes are alphanumeric combinations that represent specific issues within the Detroit Diesel DD15 engine and its components.

Can I continue driving with a fault code?

Driving with a fault code depends on its severity. Some codes may indicate minor issues, while others signal potential engine or safety concerns. It’s best to address fault codes promptly to prevent further damage.

How often should I check for fault codes?

Regularly checking for fault codes during routine maintenance or when you notice unusual symptoms is advisable. It helps identify and address issues before they escalate.

Are all DD15 fault codes serious?

Not all fault codes carry the same level of severity. Some may be related to minor sensor glitches, while others could indicate critical engine or safety problems. Consult a professional to determine the seriousness of a specific code.

Can fault codes be cleared without fixing the issue?

While it’s possible to clear fault codes, it’s crucial to address the underlying problem. Clearing codes without fixing the issue is a temporary solution that may lead to more significant problems in the future.

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For more information on Detroit equipment and related services, visit the official Detroit website.