What is the diagnostic code for a Chevy Duramax?

Below are common check engine light trouble codes for the Chevy/GM Duramax diesel. This list has been updated to includes Chevy/GM Duramax diagnostic trouble codes. At Thoroughbred Diesel we are a real diesel performance and repair shop that offers free advice. Call us at 1-866-737-4966 with any questions you may have about your diesel.

What is the code on the Duramax fuel injector?

Low and behold, the P1249 had returned as it had numerous times before. But the only code displayed was a P0205, which indicated a circuit fault on #5 fuel injector. Working quickly before the cylinder heads warmed up, we removed the FICM connectors and repeated the pin test.

Where is the trouble code on a GMC?

When retrieving GMC trouble codes with an OBD II scan tool, proceed as follows: 1. Connect scan tool to the 16-pin data link connector (DLC) located underneath the steering column. The connector may have a removable cover. 2. Turn the ignition on.

What is the resistance of a Duramax injector circuit?

The specified resistance at room temperature is between 0.3 to 0.4 ohms. Before measuring the resistance of any circuit, remove the negative cable on each battery. Since .3 ohms is a very small resistance, the ohmmeter leads must be clean and the meter must be perfectly “zeroed” by crossing the leads and pushing the “relative” button.

What are the diagnostic codes on a Chevy Duramax?

Diagnostic trouble codes (or fault codes) are codes that are stored by the on-board computer diagnostic system. These are stored in response to a problem found in the truck by the system. Here is a list of Chevy Duramax diagnostic codes to help you in figuring out what is wrong with your vehicle.

What is the trouble code for a Chevy?

List of Chevy Trouble Codes (DTC) P0100 Mass or Volume Air Flow Circuit Malfunction. P0101 Mass or Volume Air Flow Circuit Range/Performance Problem. P0102 Mass or Volume Air Flow Circuit Low Input. P0103 Mass or Volume Air Flow Circuit High Input. P0104 Mass or Volume Air Flow Circuit Intermittent.

What are the DTC codes for Ford Mondeo?

P0102 Mass or Volume Air Flow Circuit Low Input P0103 Mass or Volume Air Flow Circuit High Input P0104 Mass or Volume Air Flow Circuit Intermittent P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

How many versions of the Duramax diesel engine are there?

All told, there are six different iterations of the Duramax diesel engine: LB7, LLY, LBZ, LMM, LML, and L5P spanning from 2001 to the present day. Each version of the engine has its own issues and quirks, and some are less problematic than others.

Where are the trouble codes stored on a Chevy truck?

Chevy/GM Duramax Diagnostic Trouble Codes (DTC) Diagnostic trouble codes (or fault codes) are codes that are stored by the on-board computer diagnostic system. These are stored in response to a problem found in the truck by the system.

Are there any problems with the LLY Duramax?

In terms of LLY injector problems, GM had sorted out the internal failures with the 2004 ½ redesign, but the LLY Duramax would occasionally exhibit a trouble code for the injectors, but in most cases it turned out to be an issue with the injector harness rubbing through and causing a short or open in the wiring.

What to do if your Duramax injector is not working?

To relieve this problem, the wiring harness (or affected portion of the harness) will need to be replaced/repaired. Often, you can verify the problem by wiggling the wires around the injector. If the problem goes away (even momentarily), you’ve identified the affected zone.

Are there any problems with the Commons 6.6L Duramax Diesel?

Common Problems with the 6.6L Duramax Diesel. The 6.6L Duramax has been in production since 2001 and has proved, on a large scale, to be a relatively reliable and durable platform. While various versions of the engine have surfaced over the years, all generations of the Duramax are based on the same foundation.

Are there any problems with the 6.6L LLY Duramax?

Thankfully, the LB7 injector problems were resolved, but some new problems revealed themselves. Some of these 6.6L LLY Duramax engine problems stem from the fact that it has significantly more horsepower and torque compared to the original Dmax.

Why is my Duramax diesel engine not working?

The trucks computer keeps track of how much fuel needs to be added or subtracted from each individual cylinder to make the engine run smoothly, and this value is called the balance rate. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement.

What’s the Check Engine light on a Duramax?

Started up fine. Only thing i noticed was that the oil pressure was pegged out at 120 and the battery was around 10 or 11 marker on the gauge. Ran and drove fine. Keep in mind the temp was around 18F this morning when i left for work. You will need a scanner to pull the codes.

Which is the diagnostic code for a GMC check engine light?

1 Refer to our Generic OBD II code list for definitions on all other GMC diagnostic trouble codes. 2 Manufacturer Specific Codes 3 P1031 4 P1032 5 P1105 6 P1106 7 P1107 8 P1108 9 P1109 10 P1111

What’s the glowplug code on my Duramax Diesel?

Had them pull the codes and they got 3 codes. P133F came up 3 times and then there was also a P0894. Any details you can share on those codes? P133F is #8 glowplug hot resistance fault. Did you determine if the Elevated Idle is enabled? Are you using remote start?

What is the RPO code for a Duramax Diesel?

You can either look it up by application or check the 8 th digit of your truck’s VIN to confirm. Duramax Diesel engine RPO codes include: Applications: 2001-Early 2004 Chevy Silverado and GMC Sierra, 2001-2005 Chevy Kodiak and GMC TopKick Details: First version of the Duramax diesel.

When did the Duramax 6.6L turbo diesel come out?

The Duramax 6.6L V8 turbo-diesel engine is nearing its 20th year of production, after debuting in 2001. Over the engine’s lifespan it has gone through 6 different engine variations: LB7, LLY, LBZ, LMM, LML, and L5P.

When did the first Duramax V8 engine come out?

Duramax Engine LB7 2001 to 2004 The first Duramax V8 was introduced in 2001 and was given the code name LB7. The introduction of common rail injection powered by the Bosch CP3 injection pump made the LB7 Duramax stand apart from other diesels of the day with excellent power and efficiency.

What does it mean if your PCM code is u0100?

Check your car for any ECM or TIPM/BCM trouble codes. These can mean there are deeper, underlying issues with your engine, so we want to rule those possibilities out first. If there’s an issue with your TIPM or BCM, try troubleshooting those parts. They’re on the same harness as the PCM, and can cause faults if they fail.

What does it mean when your car says u0100?

But there are other things that could indicate a U0100 code to appear as well. – Your car doesn’t start, or the starter doesn’t even turn over when the ignition key is turned.

What is the first year of the Duramax?

The LB7 Duramax was first introduced for the 2001 model year as General Motors retired its 6.5L Detroit diesel. In every possible way, the Duramax was superior to the outdated Detroit and marked a revolutionary turning point for GMC and Chevrolet pickups in the diesel marketplace.

What kind of cylinder head does a Duramax use?

Not only has the head design proven reliable, but other manufacturers have begun to employ aluminum alloy cylinder heads on their diesels in order to benefit from the significant weight saving.

What causes the dtc-c0321 diagnostic trouble code?

DTC-C0321: Motor A or B Circuit Failure Description: DTC-C0321 will be set when the Transfer Case Control Module (TCCM) fi nds a fault in an open lock solenoid, open motor lock control, or an open motor feed. This will cause the 4WD to be disabled and will turn on the “Service 4WD” trouble light. What causes DTC-C0321: 1.

What’s the generic code on a diesel engine?

It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. This code relates to the device diesels use to heat the cylinder head for a few seconds when attempting to start a cold engine called a glow plug.

Why does my GMC have a fault code?

Once you locate the battery, the method for clearing the code is the same, regardless of the year, make or model of GMC vehicle. Fault codes can be set off in a vehicle for a variety of reasons, ranging from a loose gas cap to a major mechanical problem.

What kind of exhaust gas does a Duramax use?

First Duramax to use an EGR (exhaust gas recirculation) system. Applications: 2006 Silverado, Sierra, Kodiak and TopKick, 2007 Silverado and Sierra Classic (older GMT800 body style, NOT the newer GMT900), 2006 Chevy Express and GMC Savana full-size vans (first year of the vans offering the Duramax as an option)

What does c0265 stand for on a GMC?

A C0265 on your Chevy or GMC Will read: Electronic Brake Control Module Relay Circuit. While that’s a mouthful, it doesn’t really give you a great idea of what the problem is. The EBCM, or electronic brake control module, is the electronic system that controls brake sensors and activates both traction control and ABS.

Why did my GMC lose its throttle actuator?

Possible causes. Faulty Throttle Actuator Control (TAC) module. Throttle Actuator Control (TAC) module harness is open or shorted. Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)

When is the u0107 GMC code detected?

When is the U0107 GMC code detected? The U0107 code is set when the Powertrain Control Module (PCM) detects a loss of data or invalid data from the Throttle Actuator Control (TAC) U0107 GMC Possible Symptoms Engine Light ON (or Service Engine Soon Warning Light) No throttle response U0107 Gmc Description

What are the diagnostic codes for General Motors?

GM Specific Powertrain Diagnostic Trouble Codes. P1117 Engine Coolant Temp. Signal Out-Of-Range Low. P1118 Engine Coolant Temp. Signal Out-Of-Range High. P1139 HO2S Insuff. Switching Bank 1 Sensor 2. P1187 EOT Sensor Ckt. Low Voltage.

What are the codes for GMC check engine lights?

P1245Intake Plenum Switchover Valve P1250Early Fuel Evaporation Heater Circuit P1257Supercharger System Overboost P1258Engine Coolant Overtemperature – Protection Mode Active P1260Last Test Failed SCC Or Theft Detected, Vehicle Immobilized

What’s the turbo code on a GMC Duramax?

Put the old one back in and now just have 1 code p003a . Did you find the recommended reading relevant to this discussion? Help us improve your recommendations by telling us what you would like to see.

What does the code p0673 mean on a glow plug?

The code P0673 tells you that something in the glow plug circuit is faulty causing the glow plug on cylinder #3 to fail to heat up. The entire circuit must be checked to locate the fault. Note: If a P0670 trouble code is present along with this DTC, carry out P0670 diagnosis before diagnosing this code.

Why is my Chevy Duramax Turbo not working?

Because of the condition of the stock turbo and smell of the oil I did a complete oil change then let it run for about half an hour and did another complete oil change. Truck also has new fuel filter and cleaned air filter. It has to be something electrical because when its not acting up it REALLY goes!!!

What does the VIN number on a GMC Sierra mean?

GMC SIERRA VIN decoder Every GMC car has a unique identifier code called a VIN. This number contains vital information about the car, such as its manufacturer, year of production, the plant it was produced in, type of engine, model and more.

What are the diagnostic codes for a Chevy diesel?

P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1) P0156 O2 Sensor Circuit Malfunction (Bank 2 Sensor 2) P0157 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) P0158 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2) P0159 O2 Sensor Circuit Slow Response (Bank 2 Sensor 2) P0160 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)

How to identify your Duramax diesel engine code?

Because multiple versions of the Duramax were available in some years, knowing the engine code of your Chevy Silverado or GMC Sierra will make it much easier to ensure you get the correct parts the first time. You can either look it up by application or check the 8 th digit of your truck’s VIN to confirm. Duramax Diesel engine RPO codes include:

Why does my 2500HD go into reduced engine power?

I have a 2008 2500HD that has me stumped. It will go into “reduced engine power” every few minutes. It will even do it at idle. It isn’t throwing any codes. I still suspect something to do with the throttle position sensors because they do not read 0 at idle or 100% at WOT and they don’t perfectly match either.

What causes reduced engine power, no codes?

I’ve had similar problems like this with a few trucks at the shop and all of them came down to the MAF. cleaned them, no codes or anything but would throw reduced engine. Went over the whole wiring harness, all sensors and couldn’t find a damn thing wrong.

Why does my Duramax say reduced engine power?

If you’ve got a Duramax diesel, the Reduced Engine Power warning could Illuminate for a variety of reasons. There are many different technical service bulletins (TSBs) for Duramax-powered vehicles that mention Engine Reduced Power mode.

What’s the problem with my Chevy Silverado HD?

The problem: in affected vehicles, the Malfunction Indicator Lamp (MIL) or ‘Service Engine Soon’ light may appear illuminated on the instrument panel. GM service technicians may also find a diagnostic trouble code (DTC) of P11D5 when trying to assess the problem with the vehicle.

What’s the diagnostic code for a GMC Sierra?

GM service technicians may also find a diagnostic trouble code (DTC) of P11D5 when trying to assess the problem with the vehicle. The hazards: this problem does not pose a safety risk to the driver or vehicle occupants.

What to do if your Duramax engine is having problems?

Blocking or removing it will remove the recirculation of exhaust gases which will prevent the gunk and particulate buildup in the EGR valve and intake manifold which is what primarily causes EGR problems. You will get CEL’s for doing either of these but they can be coded out with a tuner.

Where do I find the RPO code on my Chevy Silverado?

Prior to 2018, General Motors typically printed the entire list of RPO codes on a certification sticker, usually found in the glovebox. After 2018 and during the 2021 model year, that sticker was moved to the lower driver’s door jam. RPO codes are now encoded in a 2d data-matrix code that can easily read by most modern smartphones.

Are there any major problems with the L5P duramax?

Mechanically, the L5P Duramax is stout and very few major problems have been reported. One common problem is with the MAP sensor however, as it tends to clog with soot and throw a check engine light, but a simple MAP sensor spacer and a can of electrical cleaner can get you back on the road worry free and prevent the soot from building up again.

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