Duramax Trouble Code Requests
 

If you have any questions as to what trouble code you are having with your Duramax, post the code here and we will be glad to let you know what it is and help you decide what can be done to fix it if applicable. :)

THE most common code that will be brought up is

P1093 ~ Fuel Rail Pressure Low During Power Enrichment

Duramax Codes
 

P0402 ~ Exhaust Gas Recirculation (EGR) Flow Excessive

P2610 ~ Control Module Ignition Off Timer Performance

DTC P2610 can be set with a loss of battery voltage to the ECM with the ignition ON. The ignition must be in the OFF position before disconnecting the ECM.

If P2610 is set, turn the ignition OFF and then completely disconnect the ECM harness connector from the ECM for approximately 1 minute. Reinstall all of the ECM connectors and then attempt to clear codes with the scan tool.
⇒ If P2610 resets after code clear, replace the ECM



Can you reset your codes? If you can try that and see if the P0402 comes back, otherwise get ahold of John and see about getting the fingerstick replaced.

Duramax Codes
 

Did you solder the connections of the FS if not you might redo it and see if that is the problem?

Finger Stick
 

sweet never knew that was there :U:

These are the 2006 LBZ block heater codes in case anyone is interested.
PO116 (coolant temp)
PO181 (fuel temp)
PO700 (trans requested malfuction indicator lamp)
When I got these my CEL would be on steady, I had no cruise control, and the truck wouldn't shift until about 2300 RPM or so. Hope this helps.

truck thru this code P2138 can anybody tell me what it is

Go here and type it in https://www.dieselbombers.com/codes.php

P2138 Accelerator Pedal Position (APP) Sensor 1-2 Correlation (GM)

P2138 Accelerator Pedal Position (APP) Sensor 1-2 Correlation (GM)


Possibly someone with a service manual can elaborate..

I don't think you'll be able to do a whole lot without a Tech2 but:

P2138
The voltage difference between APP sensor 1 and APP sensor 2 exceeds a value of 2 percent for more than 0.3 seconds .

I'd check connections at the sensor and PCM. Maybe you just have a loose terminal or something.

Here's all the hoo-hah about it.

DTC P2138
Accelerator Pedal Position (APP) Sensor 1-2 Correlation

DIAGNOSTIC FAULT INFORMATION




IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection\Diagnostic Trouble Code Tests and Associated Procedures

TYPICAL SCAN TOOL DATA

APP Sensor 1


APP Sensor 2



CIRCUIT/SYSTEM DESCRIPTION
The accelerator pedal position (APP) sensor is mounted on the accelerator pedal control assembly. Two APP sensors, APP sensors 1 and 2 are used to monitor the accelerator pedal position. Each sensor has the following circuits:

* A 5-volt reference circuit
* A low reference circuit
* A signal circuit

The engine control module (ECM) uses the APP sensors input to determine the amount of acceleration or deceleration that is desired. Refer to Accelerator Pedal Position (APP) System Description.

CONDITIONS FOR RUNNING THE DTC

P2122, P2123, P2127, P2128

* DTC P0652, P0653, P0698, or P0699 are not set.
* The ignition is ON.
* DTC P2122, P2123, P2127, P2128 run continuously when the above conditions are met.

P2138

* DTC P0652, P0653, P0698, P0699, P2122, P2123, P2127, or P2128 are not set.
* The ignition is ON.
* DTC P2138 runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC

P2122
The ECM detects that the APP sensor 1 voltage is less than 0.8 volt for more than 0.2 second .

P2123
The ECM detects that the APP sensor 1 voltage is more than 4.75 volts for more than 0.2 second .

P2127
The ECM detects that the APP sensor 2 voltage is less than 0.3 volt for more than 0.2 second .

P2128
The ECM detects that the APP sensor 2 voltage is more than 2.5 volts for more than 0.2 second .

P2138
The voltage difference between APP sensor 1 and APP sensor 2 exceeds a value of 2 percent for more than 0.3 seconds .

ACTION TAKEN WHEN THE DTC SETS

* The control module stores the DTC information into memory when the diagnostic runs and fails.
* The malfunction indicator lamp (MIL) will not illuminate.
* The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
* The driver information center, if equipped, may display a message.

CONDITIONS FOR CLEARING THE DTC

* A current DTC Last Test Failed clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
* Clear the DTC with a scan tool.

CIRCUIT/SYSTEM VERIFICATION

1. With the ignition ON, use a scan tool to observe the APP sensor 1 for a normal voltage range between 0.89-4.57 volts . IMPORTANT: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
2. With the ignition ON, use a scan tool to observe the APP sensor 2 for a normal voltage range between 0.41-2.19 volts .
3. With the ignition ON, use a scan tool to compare APP sensors 1 and 2 percentages, verify they do not differ more than 2 percent during a full pedal sweep.

CIRCUIT/SYSTEM TESTING

P2122, P2123, P2127, or P2128

1. With the ignition ON, observe the APP sensor 1 voltage parameter with the accelerator pedal in the released position. Verify the voltage is between 0.89-4.57 volts .

o If more than 4.57 volts , test the APP sensor 1 low reference circuit for an open or a faulty ECM.
o If less than 0.80 volts , test the APP sensor 1 signal circuit for an open, a short to ground, or a faulty ECM.

2. With the ignition ON, observe the APP sensor 2 voltage parameter with the accelerator pedal in the released position. Verify the voltage is between 0.41-2.19 volts .

o If more than 2.5 volts , test the low reference for an open or a faulty ECM.
o If less than 0.3 volts , test the APP sensor 2 signal circuit for an open, a short to ground, or a faulty ECM.

3. Disconnect the accelerator pedal harness connector and verify that APP sensor 1 and 2 voltages are less than 0.1 volts .

o If more than 01 volts , test the APP sensor 1 and 2 signal circuits for a short to voltage or a faulty ECM.

4. With the ignition ON, test for 4.8-5.2 volts between each 5-volt reference circuits and a good ground.

o If more than 5.2 volts , test the affected 5-volt reference circuit for a short to voltage, or faulty ECM.
o If less than 4.8 volts , test the affected 5-volt reference circuit for an open or short to ground, or a faulty ECM.

5. Install a 3-amp fused jumper wire between the signal circuit and the 5-volt reference circuit of the APP sensor 1, and verify the APP sensor 1 voltage is greater than 4.8 volts .

o If less than 4.8 volts test the APP sensor 1 signal circuit for an open, short to ground, or a faulty ECM.

6. Install a 3-amp fused jumper wire between the signal circuit and the 5-volt reference circuit of the APP sensor 2, and verify that the APP sensor 2 voltage is greater than 4.8 volts .

o If less than 4.8 volts , test the APP sensor 2 signal circuit for an open, short to ground, or a faulty ECM.

7. With the ignition OFF, the APP sensor and the ECM harness connectors disconnected, test for infinite resistance between APP sensor 1 signal circuit and APP sensor 2 signal circuit.

o If infinite resistance, repair the short between APP sensor 1 signal circuit and APP sensor 2 signal circuit.

8. If all circuits test normal, replace the accelerator pedal. P2138

1. With the ignition OFF, disconnect the accelerator pedal and the ECM harness connectors. With a DMM, measure for a resistance value of less than 5 ohms on each APP sensor circuit.

o If more than 5 ohms , repair the circuit with the high resistance.
o If less than 5 ohms , test for a short between APP sensor 1 signal circuit and APP sensor 2 signal circuit.

2. If all circuits test normal, replace the accelerator pedal assembly.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Accelerator Pedal with Position Sensor Replacement
* Control Module References for ECM replacement, setup, and programming

u probably have to go to the dealer to get that replaced, there could be a few burnt pins in the sensor/connector.

What does the P0401 code for:w2:

Delete a cat lately??? or modify the exhaust any other way??

It's an EGR insufficient flow code.

Yes I Removed the cat and ran dual exhust all the way back 3.5":w2:

get an egr blocker and finger stick, and re route the pcv while your down there

thank god i dont have one of those i love my 12v cummins with no computers

what is tdc 0622
 

hi, new to the site. i went to install a hypertech chip in my 2002 duramax. i came up with two codes 1093 and 0622. i was told i can remove this by taking to dealership and getting new injectors. im hearing this is a big problem and can sometimes be covered in an EXTENDED WARRANTY, wow that would be cool. im the second owner but i did by from dealer. you think they wouldve replaced them at the five year factory service. any info would be greatly appreciated.
i researched p0622. it is generator f- term. field f control. anyone had this before

Why would they replace something that hasnt posed a problem and will cost them close to $5K to do?

i was told by a gm mechanic that if im getting the injector code, thats enough to consider them faulty. bring into dealer and they would warranty them. some research ive done has told me a clogged or faulty fuel filter could bring up this code. i just dont want to clear the code if its something i could get fixed cheap. but my truck runs fine, so i could probably just clear it and wait for something to fail.

how long has it been since the FF has been changed

thats what im looking into right now. if i change my fuel filter (and that is what is causing the code) can i expect the code to disappear or do i have to clear it and see if it comes back?

if you got a programmer reset it and see if it come back

p0101
 

i just put a mac cold air intake in my truck and the p0101 code comes on after a few starts...i know its the mass air flow thing but i dont know what to do...i dont want to get rid of the intake but i dont want my service light to be on all the time...whats my options??? and suggestions? i have reset it but it eventually comes back on:humm:

the oil from your filter has coated your maf sensor, you can stop by the local autopart store and buy some maf sensor cleaner, pull the maf sensor out and spray the hell out of it, let it dry and re install it and the code should clear itself.

its a problem with oiled filters.

i just went ahead and put my stock air system back on to see what it did and everything was ok...i think the mac air filter just lets to much air in...do u know anything about those filters? are they suppose to be good or are they junk? im thinking about just gettin a different filter and checking if it will work with the mac system...maybe like a k&n or something...

no, your stock intake system is good enough to support 500hp, it just needs a little modification....

i can find the details and pm them to ya :)

ok thatal work :U:

lemme see what i can dig up, actually i think you have the good lly does your intake happen to look like this, the 06llys are verry simmalier to lbz's urs is a 6speed to huh?

https://www.dieselbombers.com/chevy-...irbox-mod.html

yep and yep

well there u go, thats all u need for an intake :U: the delco filter is one of the best to use too i can find the thread about the study over dmax intakes, but try searching for it u might find it

thanks ill do that tomorrow and see how it goes

2006 duramax diesel my edge juice shows po621 and po403 what are they and what do i do reset it on the edge controler or what no service engine light came on thanks

Don't worry about the P0621- Generator L-Terminal Circuit

The P0403 is an EGR code- Exhaust Gas Recirculation (EGR) Solenoid Control Circuit If you changed your exhaust or deleted your Cat, this code will sometimes pop up, BUT in '06 a lot of EGR valves have been know to take a dump, so that could be it too.

DTC codes P0089 & P0380
 

I need help with there two codes. P0089 started about two months ago and I noticed a slight surge in the ideling. The P0380 started recently started. Please can someone help??
My Mechanic up and moved so I'm out of luck and getting ready to move bak to Texas and tow a trailer full of tools.

P0089 - is Fuel Pressure Regulator Performance

P0380 is Glowplug/Heater Circuit "A" Malfunction

Off the top of my head, Im not sure on how to correct either of them. You might try to clear the codes if you have a programmer or by disconnecting the battery for a bit. I will try to find some information on these codes for ya. Have you done anything to your truck, like any modifications?