# Service bulletin PIP5981D

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.

- Type: Service bulletin
- NHTSA id: 11014631
- Published by NHTSA: 2025\-03\-02
- Manufacturer's number: PIP5981D
- Manufacturer's date: 2025\-02\-26
- NHTSA component: FUEL/PROPULSION SYSTEM; POWER TRAIN

## NHTSA's summary

This Preliminary information communicates ordering process for the front and rear drive units are on restriction for all listed EV vehicles for engineering review.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11014631-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11014631-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Fuel system, Transmission and driveline

## Vehicles listed

- 2024 BRIGHTDROP ZEVO 400
- 2023 to 2024 BRIGHTDROP ZEVO 600
- 2025 CADILLAC ESCALADE IQ
- 2023 to 2025 CADILLAC LYRIQ
- 2025 CADILLAC OPTIQ
- 2024 to 2025 CHEVROLET BLAZER EV
- 2025 CHEVROLET BRIGHTDROP 400
- 2024 to 2025 CHEVROLET EQUINOX EV
- 2024 to 2025 CHEVROLET SILVERADO EV
- 2022 to 2025 GMC HUMMER EV PICKUP
- 2024 to 2025 GMC SIERRA EV

## Recalls for the same vehicles and component

- [26V129000](/recalls/nhtsa/26V129000.md), 2026-03-05: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP:CONTROL/DRIVE MODULE

## Other bulletins for the same vehicles and component

- [N242452131\-02](/bulletins/11037312.md), 2026-09-15, Emissions: FUEL/PROPULSION SYSTEM. Emission Recall. General Motors has decided to conduct a Voluntary Emission Recall involving certain 2023\-2024 model year Chevrolet Colorado / Silverado 1500 and GMC Canyon / Sierra 1500 vehicles equipped with a 2.7L engine \(RPO L3B\). The Engine Control Module \(ECM\) may not sufficiently control fuel injector flow rate under certain driving conditions. Dealers are to reprogram the ECM.
- [N252502891\-01](/bulletins/11036308.md), 2026-08-20, Service campaign: POWER TRAIN. Certain vehicles may have a condition in which the internal differential nut was cross threaded or missing during assembly. Dealers will review the vehicles service history in IVH, and if necessary, replace the rear electric drive transmission module.
- [N252502890\-01](/bulletins/11036307.md), 2026-08-20, Service campaign: POWER TRAIN. Certain vehicles may have a condition in which the internal differential nut was cross threaded or missing during assembly. Dealers will review the vehicles service history in IVH, and if necessary, replace the front electric drive transmission module.
- [N242471460\-01](/bulletins/11036306.md), 2026-08-20, Service campaign: POWER TRAIN. Certain vehicles may have been built with an Electric Drive Unit mounting bolt that is too long, causing damage to the Drive Unit case. Dealers will inspect and replace the Electrical Drive Unit if necessary.
- [N242452130\-01](/bulletins/11035685.md), 2026-08-04, Service campaign: FUEL/PROPULSION SYSTEM. Certain vehicles may have a condition in which the Engine Control Module \(ECM\) does not sufficiently control fuel injector flow rate under certain driving conditions. Dealers are to reprogram the ECM.
- [661.40](/bulletins/11033006.md), 2026-05-29, Over\-the\-air update: UNKNOWN OR OTHER; FUEL/PROPULSION SYSTEM. • Improvements to diagnostics and service messaging for battery health, particularly in humid conditions. • Improvements to transmission diagnostics used for shifting. • Improvements to charging system diagnostics. • Fixes to help protect EV adapter from overheating while charging. • Reduces unnecessary service messages, check engine light activations, and OnStar calls from your vehicle.
- [24\-NA\-262](/bulletins/11026024.md), 2025-12-03, Service bulletin: POWER TRAIN. This bulletin helps aid the tech in possible 10L100 transmission noise that may be normal or abnormal depending on the concern noted.
- [N242438500\-04](/bulletins/11025665.md), 2025-11-24, Emissions: FUEL/PROPULSION SYSTEM. Emission Recall. General Motors has decided to conduct a Voluntary Emission Recall involving certain 2024 Model Year Chevrolet Silverado and GMC Sierra vehicles with a 6.6L diesel engine. The Engine Control Module \(ECM\) may not properly diagnose, may not set Diagnostic Trouble Codes \(DTCs\), or may not illuminate the Malfunction Indicator Light \(Check Engine Light\) if certain fault conditions of the Selective Catalyst Reduction \(SCR or NOx\) catalyst occur. Dealers are to reprogram the ECM and TCM.
- [N252526150](/bulletins/11024873.md), 2025-11-04, Service campaign: FUEL/PROPULSION SYSTEM. Service Update. Certain vehicles listed above may have a condition which can cause the fuel pump power control module to fail. If this were to occur, fuel flow to the engine could be interrupted. Dealers will replace the fuel pump power control module.
- [25\-NA\-108](/bulletins/11024499.md), 2025-10-27, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides a procedure to inspect and verify the drive shafts are over extending past the 5mm tolerance, causing the customers concern of a fluid leak under the vehicle.

JSON: [/v1/bulletins/11014631](/v1/bulletins/11014631)

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