What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
4Original wording in English
BUICK, CADILLAC, CHEVROLET, GMC, HUMMER, PONTIAC, SAAB, SATURN
Reported code forms P2138
This technical bulletin provides repair information for repairing the IP to body harness connector to correct a customer concern for intermittent Malfunction Indicator Lamp (MIL) illuminated with Reduced Engine Power…
CADILLAC, CHEVROLET, GMC
Reported code forms P2138
This Preliminary Information communication provides information to the technician about vehicles that may have Service Engine Soon Malfunction Indicator Lamp on or reduced power message. Technician may find Diagnostic…
BUICK, CADILLAC, CHEVROLET, GMC, HUMMER, PONTIAC, SAAB, SATURN
Reported code forms P2138
This technical bulletin provides repair information for repairing the IP to body harness connector to correct a customer concern for intermittent Malfunction Indicator Lamp (MIL) illuminated with Reduced Engine Power…
CHEVROLET, GMC, HUMMER, SAAB, SATURN
Reported code forms P2138
GENERAL MOTORS: INTERMITTENT MIL/SES/ DTC P2138 WITH REDUCED ENGINE POWER (REPAIR INSTRUMENT PANEL (IP) TO BODY HARNESS CONNECTOR). 2005-08 GM PASSENGERS CARS/LIGHT DUTY TRUCKS (INCL. SATURNS). *PE UPDATED 11/5/10. *PE…
Check vehicle applicability
13A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| GMC | SIERRA 2500 | 2018 |
| GMC | SIERRA 2500 | 2016 |
| GMC | SIERRA 2500 | 2015 |
| GMC | SIERRA 2500 | 2014 |
| GMC | SIERRA 2500 | 2013 |
| GMC | SIERRA 2500 | 2012 |
| GMC | SIERRA 2500 | 2011 |
| GMC | SIERRA 2500 | 2010 |
| GMC | SIERRA 2500 | 2009 |
| GMC | SIERRA 2500 | 2008 |
| GMC | SIERRA 2500 | 2007 |
| GMC | SIERRA 2500 | 2006 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.