# Service bulletin G\-203256

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: 10081063
- Published by NHTSA: 2016\-09\-28
- Manufacturer's number: G\-203256
- Manufacturer's date: 2014\-10\-27
- NHTSA component: EQUIPMENT

## NHTSA's summary

14262 \- SPECIAL COVERAGE. ON SOME HYBRID 2\-MODE \(HP2\) VEHICLES, THE ACCESSORY POWER MODULE \(APM\) MAY NOT INITIALIZE WHEN THE VEHICLE IS STARTED IN COLD TEMPERATURES AND THE APM IS COLD. ONCE THE APM WARMS UP, IT WILL INITIALIZE AND PERFORM AS DESIGNED. HOWEVER, DURING THE TIME THAT THE APM IS NOT OPERATIONAL, IT COULD RESULT IN A LOSS OF POWER STEERING ASSIST AND THE BATTERY MAY NOT CHARGE. IF THIS CONDITION OCCURS, THE SERVICE POWER STEERING, SERVICE HYBRID SYSTEM, OR SERVICE BATTERY CHARGING SYSTEM MESSAGE WILL APPEAR IN THE DRIVER INFORMATION CENTER, THE MALFUNCTION INDICATOR LAMP AND RED BATTERY TELLTALE MAY ILLUMINATE, AND DTC U1821 AND U182A WILL BE PRESENT. DEALERS ARE TO REPLACE THE APM.

## 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

Equipment and accessories

## Trouble codes named

U1821, U182A

## Vehicles listed

- 2009 to 2013 CADILLAC ESCALADE
- 2009 to 2013 CHEVROLET SILVERADO 1500
- 2008 to 2013 CHEVROLET TAHOE
- 2009 to 2013 GMC SIERRA 1500
- 2008 to 2013 GMC YUKON

## Recalls for the same vehicles and component

- [18V267000](/recalls/nhtsa/18V267000.md), 2018-04-26: EQUIPMENT
- [13V544000](/recalls/nhtsa/13V544000.md), 2015-10-30: EQUIPMENT:OTHER:LABELS
- [2010189](/recalls/tc/2010189.md), 2010-06-07: Accessories

## Other bulletins for the same vehicles and component

- [PI0488C](/bulletins/10254219.md), 2024-05-06, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; POWER TRAIN. Diagnostic Information for Transmission.
- [PI0718B](/bulletins/10253616.md), 2024-04-29, Service bulletin: EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Audio System Speaker Rattle, Buzz Noise, Poor Sound
- [PI0689B](/bulletins/10253606.md), 2024-04-29, Service bulletin: EQUIPMENT. Tool or Utility Box Sagging, Mis\-aligned.
- [PI0688F](/bulletins/10253605.md), 2024-04-29, Service bulletin: EQUIPMENT:ELECTRICAL:INFOTAINMENT:BLUETOOTH/WIFI. Poor Voice Quality During Bluetooth Call or OnStar® Personal Call.
- [PI0688E](/bulletins/10253604.md), 2024-04-29, Service bulletin: EQUIPMENT:ELECTRICAL:INFOTAINMENT:BLUETOOTH/WIFI. Poor Voice Quality During Bluetooth Call or OnStar® Personal Call.
- [PI0688D](/bulletins/10253603.md), 2024-04-29, Service bulletin: EQUIPMENT:ELECTRICAL:INFOTAINMENT:BLUETOOTH/WIFI. Poor Voice Quality During Bluetooth Call or OnStar® Personal Call.
- [PI0657A](/bulletins/10253585.md), 2024-04-29, Service bulletin: EQUIPMENT; STRUCTURE:BODY:HATCHBACK/LIFTGATE. Liftgate Paint Damage Evident at Lower Outer Edge of Applique.
- [20\-NA\-132](/bulletins/10253527.md), 2024-04-23, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
- [17\-NA\-052](/bulletins/10253526.md), 2024-04-23, Service bulletin: WHEELS; EQUIPMENT. This bulletin updates the position of General Motors on refinishing aluminum wheels. GM has determined that wheel refinishing under warranty will no longer be performed.
- [PIP5123B](/bulletins/10253361.md), 2024-04-22, Service bulletin: EQUIPMENT:ELECTRICAL. SES Lamp On With DTC P2270.

JSON: [/v1/bulletins/10081063](/v1/bulletins/10081063)

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