P0AB9
0 owner reports and 9 manufacturer filings across 7 model years from Cadillac, Mazda.
Where P0AB9 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2016 Cadillac ELR | Power Train | 2 | — | |
| 2024 Mazda CX-90 | Engine | 2 | — | |
| 2018 Cadillac CT6 | Hybrid Propulsion System | 1 | — | |
| 2026 Mazda CX-70 | Engine | 1 | — | |
| 2025 Mazda CX-70 | Engine | 1 | — | |
| 2026 Mazda CX-90 | Engine | 1 | — | |
| 2025 Mazda CX-90 | Electrical System | 1 | — | Battery → |
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
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P0AB9 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P0AB9 on that maker’s vehicles.
What it gets filed under
9 manufacturer filings name P0AB9. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P0AB9.
- 09-027-26 Service bulletin2026-09-29 · Engine
- 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 connector terminals causes the MAIN Relay to be falsely detected as ON. As a result, the Battery ECU may incorrectly determine the relay status, preventing READY mode activation and re
- SA-076-23 Service bulletin2023-11-04 · Engine And Engine Cooling
- 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 eliminate this concern, the control software of the PCM has been modified.
- N202206490 Service bulletin2020-06-11 · Hybrid Propulsion System — Inverter
- 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 P0AB9 may also set. Dealers are to reprogram the drive motor power inverter module.
- PIP5202C Service bulletin2020-05-06 · Electrical System
- 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" messages on the Driver Information Center. Technician may find Diagnostic Trouble Codes a P0AB9 and P0AC4. Technician should not clear any Diagnostic Trouble Codes and ensure Global
- PIP5202B Service bulletin2019-04-15 · Power Train
- 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? messages on the Driver Information Center. Technician may find Diagnostic Trouble Codes a P0AB9 and P0AC4. Technician should not clear any Diagnostic Trouble Codes and ensure Global
What P0AB9 means
Source: SAE J2012 / OBD-IIP0AB9 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about P0AB9
Source: NHTSA files and the OBD-II standardCan I keep driving with P0AB9 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.