P0601 — Internal Control Module Memory Check Sum Error
Drivable short-term, but fix now to avoid damage.
What P0601 means
This code means the engine control module ran an internal memory check and the result didn't match what it expected, indicating a memory error. It's usually caused by a fault inside the module itself, though corrupted programming, voltage problems, or poor connections can contribute. It's a serious code that often requires reprogramming or replacing the module.
Common symptoms
- Check engine light is on
- Engine runs poorly or stalls
- Vehicle enters limp or reduced power mode
- Hard starting or no start
- Multiple unrelated trouble codes may appear
Common causes
- Internal fault in the engine control module
- Corrupted module programming or software
- Low or unstable battery voltage
- Poor ground or power connection to the module
- Water damage or corrosion at the module
Typical repair cost
$200 – $1200
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0601 code?
Only with caution. The engine may run poorly or drop into limp mode, so a short trip might be okay, but get it diagnosed before relying on the vehicle.
How much does it cost to fix a P0601 code?
Costs range from about $200 for reprogramming up to $1,200 or more if the engine control module needs to be replaced and programmed.
Is a P0601 code serious?
Yes. It points to an internal module memory error that can affect engine operation and trigger other faults, so it shouldn't be ignored.
Can a P0601 code be fixed without replacing the computer?
Sometimes. Reprogramming the module or fixing a voltage or connection issue can clear it, but a confirmed internal memory failure usually requires module replacement.