NHTSA ID Number: 11020428
Manufacturer Communication Number: 25-NA-014
TSB/Document Date: 2025-07-08
Summary
This bulletin provides a procedure to overhaul the control valve to replace a plate and worn down check ball to correct the customers concern of No Reverse, No Shift Past Third Gear - DTC P2732 Set.
Bulletin No.: 25-NA-014
Service Bulletin
Date: May, 2025
TECHNICAL
Subject:
Brand:
No Reverse, No Shift Past Third Gear - DTC P2732 Set
Model:
Model Year:
Build Date:
MHT, MI2
from
to
Silverado 1500
2024
2024
L84
Silverado 1500
2024
2025
LZ0
MQB
Sierra 1500
2024
2024
L84
MHT, MI2
Sierra 1500
2024
2025
LZ0
MQB
Involved Region or Country
from
Engine:
to
North America, Europe, Middle East, Argentina, Brazil, Bolivia, Chile, Colombia, Ecuador,
Paraguay, Peru, Uruguay, South. Korea, Philippines, Australia/New Zealand
Some customers may comment on one or more of the following conditions:
• No reverse
Condition
• No shifting past third gear
Some technicians may find P2732 (Transmission Control Solenoid Valve 6 Stuck Off)
set in the Transmission Control Module (TCM).
Cause
This condition may be caused by a mis-stamped spacer plate and worn check ball
internal of the control valve.
Correction
Replace the spacer plate and check balls in the control valve.
Important: Service agents must comply with all International
, Federal, State, Provincial, and/or Local laws
applicable to the activities it performs under this bulletin, including but not limited to handling, deploying,
preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a
conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you
must follow those applicable laws.
Service Procedure
Note: A 10EPL Internal Torx Plus Socket is required for disassembly.
1. Remove the control valve Control Valve Body Replacement.
Copyright 2025 General Motors. All Rights Reserved.
Page 2
May, 2025
Bulletin No.: 25-NA-014
6804421
2. Remove the bolts that secure the auxiliary body to the solenoid cover.
3. Remove the bolt that secures the wiring harness to the control valve body.
Bulletin No.: 25-NA-014
May, 2025
Page 3
6804426
4. Position the wiring harness aside.
5. Remove the remainder of the bolts that secure the solenoid cover.
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May, 2025
Bulletin No.: 25-NA-014
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6. Separate the Auxiliary and Auxiliary plate.
Bulletin No.: 25-NA-014
May, 2025
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6804481
Note: Lower the valve body keeping the worm trail face pointing up. There are 5 check balls in the control valve
body that are loose and can fall out.
7. Separate the control valve body and thick plate from the solenoid body.
Page 6
May, 2025
Bulletin No.: 25-NA-014
6804487
Note: Use care not to damage or bend the solenoids.
8. Stand valve body on its side with the solenoids on the base.
9. Using care, begin separating the valve body from the solenoid body.
⇒
Lower the valve body keeping the worm trail face pointing up. There are 5 check balls in the valve body that
are loose and can fall out.
Bulletin No.: 25-NA-014
May, 2025
Page 7
6804509
10. Once body is partially split, twist thermocouple and pull to remove from the valve body assembly.
Page 8
May, 2025
Bulletin No.: 25-NA-014
6804511
11. Split the assembly in half.
12. Verify that the 5 check balls remain in the control valve body.
Bulletin No.: 25-NA-014
May, 2025
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6804467
13. Ensure solenoid body is lying flat on table with spacer plate up.
− There are check balls/check valves that can fall out once removed.
14. Remove the 2 bolts holding the spacer plate to solenoid body.
15. Once spacer plate is removed, discard Spacer Plate.
Page 10
May, 2025
Bulletin No.: 25-NA-014
6858665
Note: The parts section indicates to order 5 check balls. Replacement of the undersized check ball is all that is
required. The extras were suggested in the event some are misplaced or damaged in the disassembly process.
16. Utilizing a pick or equivalent, remove the undersized check ball from the seat and discard.
− If needed, press the check ball out from the solenoid body cover side using caution when doing this to
prevent parts from falling out of the solenoid body.
17. Install the new check ball into the solenoid housing.
Bulletin No.: 25-NA-014
May, 2025
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6804538
18. Ensure all check balls are in place in solenoid body.
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May, 2025
Bulletin No.: 25-NA-014
6858662
19. Ensure the spring check valves and the VFS damper are in place in solenoid body prior to putting on
replacement spacer plate.
Bulletin No.: 25-NA-014
May, 2025
Page 13
6804467
20. Place new spacer plate on solenoid body and run down spacer plate bolts.
⇒
Torque the fasteners to 9 Y (80 lb-in).
Page 14
May, 2025
Bulletin No.: 25-NA-014
6804511
21. Take solenoid body half and set on top of valve body half – make sure harness is out of the way. There are 2
locating dowels on the valve body used for alignment.
22. Stand valve body on its side with the solenoids on the base.
23. Place thermistor back into cover side and rotate until anti-rotation feature is aligned into cast slot.
24. Place thick plate and thick plate spacer plate back on top of solenoid body cover side.
− There are 3 locating dowels to align.
Bulletin No.: 25-NA-014
May, 2025
Page 15
6814198
25. Place aux body spacer plate and aux body back on top of thick plate.
− There are 2 locating dowels to align.
Page 16
May, 2025
Bulletin No.: 25-NA-014
6837102
Important: Torque the fasteners to 9 Y (80 lb-in).Torque the aluminum fastener (1) to 3 Y (27 lb-in) plus 30°
(angle).
26. Reinstall all bolts following the bolt sequence and torque diagrams.
Reinstall aux pump O ring seal and cover.
Install the control valve assembly. Refer to Control Valve Body Replacement.
Note: Characterization and Service Fast Learn (SFL) are not required for this repair.
Parts Information
Note: Follow the procedure in SI for additional parts that may be required for the repair.
Causal
Part
Description
Part
Number
Qty
X
PLATE ASMC/VLV BODY
SPCR (W/ GSKT)
L84
24299519
1
X
PLATE ASMC/VLV BODY
SPCR (W/ GSKT)
LZ0
24299518
1
N/A
SEAL-A/TRNS
AUX FLUID
PUMP OTLT
PIPE
24271818
1
Bulletin No.: 25-NA-014
May, 2025
Causal
Part
Description
Part
Number
Qty
N/A
BOLT/SCREWC/VLV BODY
24050764
1
N/A
SEAL-A/TRNS
FLUID PUMP
24290889
1
N/A
SEAL-A/TRNS
FLUID PUMP
24270191
1
N/A
SEAL-EXH
MANIF PIPE (L) L84
15035747
1
N/A
SEAL - EXH
MANIF R - L84
15077362
1
N/A
SEAL-A/TRNS
AUX FLUID
PUMP
24047734
1
N/A
VALVE-C/VLV
BODY BALL CHK
96020431
5
N/A
Fluid A/Trans
(ULV) USA
19352619
(U.S.)
19352620
(Canada)
As Required
Page 17
Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation
8486498*
Description
Labor Time
Spacer Plate and Check Ball Replacement for L84
3.5
Spacer Plate and Check Ball Replacement for LZ0
2.1
With ULV
0.3
Add
*This is a unique Labor Operation for Bulletin use only.
Version
3
Modified
Released February 12, 2025
Revised March 05, 2025 - Added Additional Countries, Added a Note to Step 1, Added
new Graphic to Step 18, Added Step 19, Added 24299518 to Parts Information section,
Added LZ0 Information and ULV RPO to Warranty Information section.
Revised May 08, 2025 – Added 2025 Model Year.
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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TSB/Document ID: 25-NA-014
Replacement Service Bulletin Number:
MFR Communication Date: 2025-05-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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