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Service bulletin PIP5926A

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10239164
Published by NHTSA2023-07-17
Manufacturer's numberPIP5926A
Manufacturer's date2023-06-16
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT

NHTSA's summary

This Preliminary information communicates that the t-case input seal, and/or the o-ring most likely is the source of the leak between the transmission and the t-case.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Transmission and driveline, Automatic transmission

Vehicles listed
CHEVROLET SILVERADO 25002020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
26V0830002026-02-12. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY
24V7970002024-10-24. POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
PIP59502023-12-18. Service bulletin. This Preliminary information communicates DTCs P060C and/or P060D may set during an attempted SFL.
23-NA-1022023-09-09. Service bulletin. This service bulletin provides a procedure to repair wiring to correct customer concerns of Driveability, Hesitation, Transmission Shifting Rough/Harsh, Malfunction Indicator Lamp (MIL) Illuminated.
17-NA-0662023-07-25. Service bulletin. This service bulletin provides information for automatic transmission Oil Cooler Flush and flow test.
N2223926702023-05-17. Service bulletin. Service Update. Certain vehicles may have a condition where the transmission reaction carrier (an internal component) may have been damaged during assembly. Dealers are to replace the transmission.
PIP5853C2023-05-15. Service bulletin. This PI communicates to dealers and technicians a possible diode issue in the TCCM, and how to properly diagnose for a diode issue.
N232399010-012023-03-31. Service bulletin. Service Update Revision: Certain vehicles may experience an intermittent loss of communication with the Transmission Control Module (TCM). Owners who have accepted applicable terms and conditions will have the opportunity to accept these software changes using wireless over-the-air (OTA) technology without having to bring their vehicle to a dealership. Alternatively, owners may have their vehicle serviced at a GM dealer to receive these software updates. Dealers will perform a TCM module reprogramming.
16-NA-1302023-03-08. Service bulletin. This service bulletin provides information for after installation of a replacement upper valve body, the transmission may have no Reverse and no 2nd gear.
N2223832502023-01-11. Service bulletin. Service Update- Certain vehicles may experience a Malfunction Indicator Lamp (MIL). Transmission shift quality may be impacted. Dealers are to replace the Transmission Control Module.
N2223808402022-11-17. Service bulletin. General Motors has decided to conduct a Voluntary Emissions Recall on certain vehicles with a 6.6L engine (RPO L8T). The Transmission Control Module (TCM) in these vehicles may have been service reprogrammed with incorrect calibrations. If this occurred, the transmission shift quality and timing could be degraded. Dealers are to reprogram the TCM.
PIP5621C2022-10-17. Service bulletin. This Preliminary information communicates to the dealer technician that TAC recommends the utilization of the GDS2 software to aid in diagnosing automatic transmission concerns. TAC is requesting the GDS2 session logs be sent in before the dealer contacts TAC.