# Service bulletin PIP5952

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: 10249285
- Published by NHTSA: 2024\-01\-29
- Manufacturer's number: PIP5952
- Manufacturer's date: 2023\-12\-12
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

This preliminary information communicates to all field technicians the imperative protocol that if any of the listed codes are detected, currently or historically, the specified procedure must be strictly followed prior to the replacement of any A28B secondary contactor assembly. This advisory highlights that the presence of these codes could be indicative of a potential calibration anomaly. By following the outlined procedure, it is likely that the concern can be resolved without the necessity for additional parts.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10249285-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10249285-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2023 CADILLAC LYRIQ
- 2024 CADILLAC redundant LYRIQ
- 2024 GMC HUMMER EV SUV

## Recalls for the same vehicles and component

- [25V356000](/recalls/nhtsa/25V356000.md), 2025-05-29: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT:ELECTRICAL:INFOTAINMENT:VIDEO \(TOUCH\)SCREEN/MONITOR/UNIT
- [23V682000](/recalls/nhtsa/23V682000.md), 2023-10-12: ELECTRICAL SYSTEM:BODY CONTROL MODULE:SOFTWARE
- [23V367000](/recalls/nhtsa/23V367000.md), 2023-05-25: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY

## Other bulletins for the same vehicles and component

- [N252529080](/bulletins/11030439.md), 2026-04-01, Service campaign: ELECTRICAL SYSTEM. Service Update. Certain vehicles listed above may be missing a high voltage header plug on the RESS battery pack drive motor connector. Dealers are to inspect the RESS pack connectors and install the proper HV Header Plug if missing.
- [25\-NA\-126](/bulletins/11024941.md), 2025-11-05, Service bulletin: ELECTRICAL SYSTEM. This service bulletin provides information on the wireless charging feature not working or intermittently working, with the replacement of the Wireless Charging Module.
- [25\-NA\-044](/bulletins/11024498.md), 2025-10-27, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This service bulletin provides information for dealers/technicians on SPS2 Hybrid/EV Battery Data Retrieval for Service High Voltage DTCs.
- [24\-NA\-202](/bulletins/11024496.md), 2025-10-27, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This service bulletin provides dealers with Warranty Administration information on North American Charging Standard \(NACS\) DC Adapter Warranty Claim Information.
- [23\-NA\-202](/bulletins/11024487.md), 2025-10-25, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This service bulletin provides information on High Voltage Drive Motor Battery \- TAC Approval and Exchange Program for BrightDrop, Chevrolet Silverado EV, and GMC Sierra EV, HUMMER EV/SUV.
- [18\-NA\-180](/bulletins/11024324.md), 2025-10-16, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This Warranty Administration service bulletin provides Lithium\-Ion battery Exchange Process and Transaction Submission information.
- [23\-NA\-151](/bulletins/11023484.md), 2025-10-02, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This service bulletin and criteria within are to determine the internal state of the High Voltage Battery and core return shipping method.
- [PIE0753I](/bulletins/11023388.md), 2025-09-30, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This engineering information \(EI\) will assist GM to recover a small number of electric vehicle battery packs from customer\-owned vehicles in the field for further engineering study and analysis.
- [22\-NA\-083](/bulletins/11023367.md), 2025-09-27, Service bulletin: FUEL/PROPULSION SYSTEM; ELECTRICAL SYSTEM. This service bulletin provides Requirements for Replacement of the Dual Mode Cord Set Under Warranty.
- [18\-NA\-180](/bulletins/11023365.md), 2025-09-26, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This Warranty Administration service bulletin provides Lithium\-Ion battery Exchange Process and Transaction Submission information.

JSON: [/v1/bulletins/10249285](/v1/bulletins/10249285)

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