Where are you getting the parts from?

 

dealer

 

There was a design change --

DEF Tank Wiring Harness Pinout Change – TechLink

gm-techlink.com

DEF Tank Wiring Harness Pinout Change
February 24, 2022
After replacing the wiring harness on the Diesel Exhaust Fluid (DEF) tank on some 2020-2022 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine (RPO L5P), several DTCs may set. DTCs P20B9 (Reductant Heater 1 Control Circuit) and P20C1 (Reductant Heater 3 Control Circuit) may be caused by a wiring change to the service DEF tanks. (Fig. 5)

Fig. 5

If these conditions are found, examine the 16-pin wiring harness connector to verify which wiring harness is installed on the vehicle prior to ordering any parts. On the first-design DEF tank harness, pin location 12 will be empty. The second-design DEF tank harness, pin location 12 has a wire in the connector. (Fig. 6)

Fig. 6

For complete wiring pinout charts for the first-design harness and second-design harness, refer to #PIP5838.

 

Model years 2020 through early build 2022 were originally built with cavities 6, 12 and 13 unoccupied. After mid-year 2022 (herein known as late build), the pump/sender assembly and the corresponding connector terminals were moved. Terminal 10 was moved to cavity 12 and terminal 11 was moved to cavity 6. All tanks built after that date, including tanks to service the 2020 – early build 2022 are configured this way. If it is necessary to replace the reductant tank in an early build vehicle, it will come with the correct harness already installed and installation would proceed with no special instructions.

 

originally installed the tank with harness it came with but heater 1 and 3 wouldnt come on when turning on heaters with active command. So DEF message came back on dash and check engine light on. So now installed another tank with correct harness. So should I be using the modified harness and maybe the module is shot from the heater burned. Lost at this point. I wish GM would just give you the right parts or issue a recall at this point.

 

Document ID: 5258414
DTC P149F, P208A-P208D, P214E, or P2C11
Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis
• An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC DescriptorDTC P149F
Reductant Pump Resistance Performance
DTC P208A
Reductant Pump Control Circuit
DTC P208B
Reductant Pump Performance
DTC P208C
Reductant Pump Control Circuit Low Voltage
DTC P208D
Reductant Pump Control Circuit High Voltage
DTC P214E
Reductant Pump High Current
DTC P2C11
Reductant Pump Low Current
Diagnostic Fault Information

Circuit​	Short to Ground​	Open/High Resistance​	Short to Voltage​	Signal Performance​
Control A​	P208C​	P208A​	P208D​	—​
Control B​	P208C​	P208A​	P208D​	—​
Control C​	P208C​	P208A​	P208D​	—​
Low Reference​	—​	—​	—​	—​

Circuit/System Description
For an overview of the component/system, refer to: Exhaust Aftertreatment System Description

Circuit​	Description​
Control​	The output circuit varies between ground and 12 V. The motor is bidirectional.​
Low Reference​	Grounded through the control module.​

Conditions for Running the DTCP208A, P208C, P208D, P214E

• DTC P10F4, P20FF, U010E = Not set
• Ignition = On or Engine = Running
• Ignition Voltage = Greater than 11 V

Frequency the DTC runs = Continuously — After the running conditions are met
P149F, P208B, P2C11

• DTC P10C9, P10CA, P10DA, P10DB, P14FA, P20FF, U010E, U2412, U2626 = Not set
• DTCs related to the following system/component = Not Set B194 Reductant Pressure Sensor
• No other DTCs related to the concerned component are set.
• Ignition = On or Engine = Running
• Ignition Voltage = Greater than 11 V

Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 63 s
Conditions for Setting the DTC
P149F
Reductant Pump = Resistance Out Of Range
P208A
Control Circuit = Open
P208B
Reductant Pump Speed = Not within a calibrated range
P208C
Control Circuit = Short to Ground
P208D
Control Circuit = Short to Voltage
P214E
Control Circuit = High Current
P2C11
Control Circuit = Low Current
Actions Taken When the DTC Sets
DTCs listed in the DTC Descriptor category = Type A DTC
Warning Message = Service Emission System / Service Exhaust Fluid System
Conditions for Clearing the DTC
DTCs listed in the DTC Descriptor category = Type A DTC
Reference InformationSchematic Reference
Engine Controls Schematics
Connector End View Reference
Master Electrical Component List
Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
Circuit/System Verification

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC P10C9, P10CA, P10DA, P10DB, P14FA ,P204B, P204C, P204D, P204E, P20FF, U010E, U2412, U2626 is not set.
   • If any of the DTCs are set
     Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
   • If none of the DTCs are set
3. 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 data.
   Verify the DTC does not set.
   • If the DTC sets
     Refer to: Circuit/System Testing
   • If the DTC does not set
4. All OK.

Circuit/System Testing

1. Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
2. Ignition/Vehicle & All vehicle systems » Off
3. Disconnect the electrical connector: A38 Reductant Pump and Sensor Assembly
4. Test for less than 10 Ω between the test points: Low Reference circuit terminal 14 & Ground
   • If 10 Ω or greater
5. 1. Disconnect the electrical connector: @ K115 Reductant Control Module
   2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 14 @ Component harness & Terminal 36 @ Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component: K115 Reductant Control Module
6. • If less than 10 Ω
7. Disconnect the electrical connector: @ K115 Reductant Control Module
8. Test for less than 2 Ω between the test points:
   • Control circuit terminal 7 @ Component harness & Terminal 37 @ Control module harness
   • Control circuit terminal 8 @ Component harness & Terminal 24 @ Control module harness
   • Control circuit terminal 16 @ Component harness & Terminal 11 @ Control module harness
   • If greater than 2 Ω
     Repair the open/high resistance in the circuit:
   • If less than 2 Ω
9. Test for infinite resistance between the test points:
   • Control circuit terminal 7 @ Component harness & Ground
   • Control circuit terminal 8 @ Component harness & Ground
   • Control circuit terminal 16 @ Component harness & Ground
   • If less than infinite resistance
     Repair short to ground on the circuit.
   • If infinite resistance
10. Ignition » On / Vehicle » In Service Mode
11. Test for less than 1 V between the test points:
    • Control circuit terminal 7 @ Component harness & Ground
    • Control circuit terminal 8 @ Component harness & Ground
    • Control circuit terminal 16 @ Component harness & Ground
    • If greater than 1 V
      Repair the short to voltage on the circuit:
    • If less than 1 V
12. Replace the component: A38 Reductant Pump and Sensor Assembly
13. 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 data.
    Verify the DTC does not set.
    • If the DTC sets
      Replace the component: K115 Reductant Control Module
    • If the DTC is not set
14. All OK.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification

• Emission Reduction Fluid Tank Replacement — A38 Reductant Pump and Sensor Assembly
• Reductant Control Module Replacement — K115 Reductant Control Module
• For control module replacement, programming, and setup refer to: Control Module References

Additional Procedures
Note: Performing this procedure will clear the Driver Information message for the applicable system.
Perform the scan tool control function: Reductant System Tamper Warning Service Bay Test — Perform only when the following warning message is displayed: Service Emission System / Service Exhaust Fluid System

 

If it's a new tank and harness assembly there is nothing to change.. The harness and tank will be a matched assembly..
Why haven't you taken it to the dealership?. How much time and money do you have into it now?.

 

I just changed my batteries on 2021 Duramax and now getting code P20BB and service emissions systems warning

 

Could you post troubleshooting for code p10db? I’m having same issue

 

2021 Chevy 2500 HD replaced the DEF tank at dealership. no engine light no codes but notification won't clear. Any other ideas of what it could be causing this?

 

2020 L5P 2500hd - Dealing with same exact issue, installed new def tank but still showing error codes(P208C, P20BB, P20C3). Did you or dealer come up with solution to fix this problem? Any input/info will be greatly appreciated, thanks!