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 wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0AC4Hybrid/EV Powertrain Control Module Requested MIL IlluminationManufacturer communications
9Original wording in English
CADILLAC
Reported code forms P0AC4
This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and "Reduced Propulsion"…
CADILLAC
Reported code forms P0AC4
This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and ?Reduced Propulsion?…
CHEVROLET
Reported code forms P0AC4
This Bulletin provides ECM reprogramming information to Correct DTC P3260 and P0AC4.
CHEVROLET
Reported code forms P0AC4
This Preliminary information communicates to dealers on how to diagnose and repair the vehicle if it setsDiagnostic trouble codes P0AC4 (ECM) and P2797 (HPCM)
CHEVROLET
Reported code forms P0AC4
27660 - Service Update. The engine may stall, followed by a Driver Information Center (DIC) message ?Action Required-Engine Not Available?. This will also cause diagnostic trouble codes P0AB9 (Hybrid/EV System…
CADILLAC, CHEVROLET
Reported code forms P0AC4
This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and ?Reduced Propulsion?…
Check vehicle applicability
14A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Cadillac | ELR | 2016 |
| Cadillac | ELR | 2015 |
| Cadillac | ELR | 2014 |
| Chevrolet | MALIBU | 2018 |
| Chevrolet | MALIBU | 2017 |
| Chevrolet | MALIBU | 2016 |
| Chevrolet | VOLT | 2018 |
| Chevrolet | VOLT | 2017 |
| Chevrolet | VOLT | 2016 |
| Chevrolet | VOLT | 2015 |
| Chevrolet | VOLT | 2014 |
| Chevrolet | VOLT | 2013 |
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.