Drivable short-term, but fix now to avoid damage.
This code means the engine's computer detected an internal processor or Read Only Memory (ROM) fault during its self-check. ROM holds the permanent operating instructions, so an error here usually means a hardware problem inside the PCM, though bad grounds or low voltage can also be involved. Fixes typically require checking power and ground connections, reprogramming the module, or replacing the computer.
$150 – $1200
Varies by vehicle and root cause.
It's not recommended. This code involves the engine's processor and core memory, so the car may stall or refuse to start at any moment. Drive only as far as needed to reach a shop for diagnosis.
If it's a wiring or grounding issue plus reprogramming, expect $150 to $350. If the computer itself needs replacing and programming, the cost typically lands between $800 and $1,200 depending on the vehicle.
Yes, it's serious. The processor and ROM are central to running the engine and other systems, so a fault here can leave you stranded. Get it addressed quickly.
Yes. Poor or corroded ground connections can cause the computer to fail its internal self-check and set this code. A technician should verify power and grounds before condemning the PCM.