WenmarOpen by Wenmar Pro

Service bulletin 12238A

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 id10089686
Published by NHTSA2017-01-26
Manufacturer's number12238A
Manufacturer's date2012-10-30
NHTSA componentENGINE; ELECTRICAL SYSTEM:12V/24V/48V BATTERY

NHTSA's summary

12238A - SERVICE UPDATE (REVISED SERVICE PROCEDURE). THE GENERATOR CONTROL MODULE (GCM) MAY NOT FUNCTION PROPERLY, RESULTING IN THE GRADUAL LOSS OF BATTERY CHARGE, ILLUMINATION OF THE MIL, AND EVENTUAL ENGINE STALL OR NO START CONDITION. DEALERS ARE TO INSPECT AND REPLACE THE GCM, IF NECESSARY.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Electrical system, Engine, 12-volt battery

Vehicles listed
BUICK LACROSSE2012, 2013
BUICK REGAL2012

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

Other bulletins for the same vehicles and component
20-NA-1322024-04-05. Service bulletin. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
PIT5074H2023-12-11. Service bulletin. J-35616-64B Terminal Test Probe / Replacement Terminal / Terminated Lead.
PIT5074G2023-12-11. Service bulletin. Terminal Test Probe And Replacement Terminal.
12238D2023-12-04. Service bulletin. Loss of Battery Charge ? Inspect Generator Control Module
12238C2023-12-04. Service bulletin. Loss of Battery Charge ? Inspect Generator Control Module
12238B2023-12-04. Service bulletin. Loss of Battery Charge ? Inspect Generator Control Module
122382023-12-04. Service bulletin. Loss of Battery Charge ? Inspect Generator Control Module
030603004V2019-05-13. Service bulletin. This warranty administration bulletin provides policy information on the requirements for battery testing and warranty replacements.
110849001Z2019-04-22. Service bulletin. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
18NA1802019-04-22. Service bulletin. This Warranty Administration Bulletin Provides High Voltage Battery Exchange Process Information.