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.
P0AB9Hybrid/EV System PerformanceP0AB9:00PCM Start Signal SystemManufacturer communications
10Original wording in English
MAZDA
Reported code forms P0AB9
DESCRIPTION Some CX-70 and CX-90 PHEV vehicles may fail to start (enter READY mode) in cold weather, but the vehicle can often be started successfully on the next attempt. This may occur when leakage current between…
MAZDA
Reported code forms P0AB9:00
Some vehicles may exhibit the CHECK ENGINE light turning ON with DTC P0AB9:00 (PCM Start Signal System) stored in memory. This may be caused by a PCM Start Signal System error detected due to improper PCM logic. To…
CADILLAC
Reported code forms P0AB9
Certain vehicles equipped with the hybrid propulsion ? plug-in identifier (RPO HP9) may experience certain circumstances where the engine may not start as planned and the vehicle will run only on battery power. DTC…
CADILLAC
Reported code forms P0AB9
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 P0AB9
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 P0AB9
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…
Check vehicle applicability
17A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Cadillac | CT6 | 2018 |
| Cadillac | CT6 | 2017 |
| Cadillac | ELR | 2016 |
| Cadillac | ELR | 2015 |
| Cadillac | ELR | 2014 |
| Chevrolet | VOLT | 2016 |
| Chevrolet | VOLT | 2015 |
| Chevrolet | VOLT | 2014 |
| Chevrolet | VOLT | 2013 |
| Chevrolet | VOLT | 2012 |
| Chevrolet | VOLT | 2011 |
| Mazda | CX-70 PLUG-IN HYBRID | 2026 |
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.