NHTSA ID Number: 11022075
Manufacturer Communication Number: PIT6396A
TSB/Document Date: 2025-08-22
Summary
This PI communicates an issue with a SES MIL with DTC P2535, P12A6, P10DA and/or C111B maybe set after replacing the fuel pump driver module. Engineering is working on a fix, but in the meantime, dealers are to install a diode.
Bulletin No.: PIT6396A
Service Bulletin
Date: August, 2025
PRELIMINARY INFORMATION
Subject:
Brand:
SES MIL with DTC P2535 / P12A6 / P10DA / C111B / P157A After Fuel Pump
Driver Module Replacement 13565642
Model:
Model Year:
from
VIN:
to
from
Engine:
to
Silverado
1500
2020-2021
ALL
All
3.0L LM2
All
Silverado
1500 LTD
(RPO J21,
VIN Digit 5
= W or Y)
2022
All
All
3.0L LM2
All
Silverado
2500
2020-2023
All
All
6.6L L5P
All
Silverado
3500
2020-2023
All
All
6.6L L5P
All
Sierra 1500
2020-2021
All
All
3.0L LM2
All
Sierra 1500
2022
Limited (RPO
J21, VIN Digit
5 = 8 or 9)
All
All
3.0L LM2
All
Sierra 2500
2020-2023
All
All
6.6L L5P
All
Sierra 3500
2020-2023
All
All
6.6L L5P
All
Involved Region or Country
North America
Additional Options (RPO)
Without Dual Fuel Tanks N2N
Condition
After the K111 fuel pump driver module is replaced with GM P/N 13565642 a SES MIL
with DTC P2535, P12A6, P10DA, C111B, and/or P157A maybe set. If the DTCs are
cleared, they will stay cleared for that ignition cycle but will return at ignition on for the
following ignition cycles.
Note: Please verify the correct part number 13565642 fuel pump driver module is installed. If the incorrect fuel pump control module is installed the same DTCs can reset even
after preforming this PI. Cases have been received of repeat come backs due to the incorrect part number 13565641 being installed.
Cause
The cause of this concern is the K111 Fuel pump driver module has changed P/N from
13558813, 13540026 and 13531869 to one new P/N of 13565642. The new P/N could
cause a voltage feed back of approximately 2 volts on the Ignition 1 circuit 439 after the
ignition is turned off. The voltage is back feeding through the water-in-fuel sensor circuit
6862 terminals 1 of the K111 Fuel pump driver module.
Note: If circuit 6862 does not go to terminal 1 of the K111 Fuel pump driver module then
disregard this PI as it does not apply.
Copyright 2025 General Motors
. All Rights Reserved.
Page 2
August, 2025
Bulletin No.: PIT6396A
Correction
Use GDS2 and go into one of the ECM data lists that displays the parameter for the Ignition 1 voltage. In most
cases, the ignition 1 voltage parameter can be found using the following GDS2 path: ECM>Data Display>Auto Trans
Data parameter "Ignition 1 Signal" volts. With the ignition turned on there should be system voltage. Next, while
monitoring the parameter turn the ignition off and check if the voltage drops to around 2 volts. If so, then unplug the
E11A Fuel Heater/Water In Fuel sensor and recheck the ignition 1 voltage parameter again using GDS2. If the
ignition 1 voltage now drops to near 0 volts, when the ignition is turned off, then continue with the below repairs. If
the voltage does not drop, then this PI does not apply and perform normal SI diagnostics.
Repair information
Engineering is working on design improvements for a new fuel pump driver module. In the meantime, a diode can
be installed in line with the water-in-fuel sensor circuit 6862, shown below (1), to correct the issue.
6954816
1. Locate either the K111 fuel pump driver module connector terminal 1 OR the E11A Fuel Heater/Water In Fuel
sensor connector terminal 3, whichever is the most convenient to install a mini inline fuse holder. Next, cut circuit
6862 a few inches from the connector. Then connect a mini fuse holder, see parts sections for details, in line with
circuit 6862 using two salmon splice sleeves, as shown below (3). In the example below, the repair is being done at
the K111 fuel pump driver module (2) end, but it could be done at the E11A Fuel Heater/Water In Fuel Sensor
connector end, whichever is most convenient.
Bulletin No.: PIT6396A
August, 2025
Page 3
6956149
2. Install a fuse style diode, GM P/N 12135037, into the mini inline fuse holder so the arrow on the diode is pointing
towards the E11A Fuel Heater/Water In Fuel Sensor, as shown above (1).
3. After installing the diode close the weather seal cap on the mini inline fuse holder and then wrap tape around the
cap to help keep it closed. Then retape the wiring harness as shown below (4). In the example below, the weather
seal cap was not taped close, but it needs to be to help keep it from opening.
4. After the repairs are completed use GDS2 to verify the ECM Ignition 1 voltage now drops to near 0 volts when the
ignition is turned off.
6956150
Page 4
August, 2025
Bulletin No.: PIT6396A
Parts Information
Description
Part Number
Qty
12135037
1
Sealed mini fuse holder
Obtain
1
locally
Littlefuse
0FHM0003Z
XJP or similar
Salmon splice sleeves
19300089
2
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the appropriate labor operation for the repair being performed. Reference the Applicable Warranties section of Investigate
Vehicle History (IVH) for coverage information.
Labor
Operation
5480948*
Description
Labor Time
Install diode into circuit
6862 to prevent voltage
feedback
1.0 Hrs
*This is a unique Labor Operation for Bulletin use only.
Version
2
Modified
06/11/2025 — Created on.
08/04/2025 - Updated to add a note to the Cause section
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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TECHNICIAN
CERTIFICATION
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TSB/Document ID: PIT6396A
Replacement Service Bulletin Number:
MFR Communication Date: 2025-08-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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