Is It Safe to Drive With a P0801 Code?
Common Symptoms of a P0801 Fault
EML on
Transmission warning light
Possible issues selecting reverse
No other driveability issues usually
Possible Causes of P0801
A P0801 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
Reverse Inhibit Solenoid Wiring
Wiring to the reverse inhibit solenoid is damaged.
Reverse Inhibit Solenoid Failure
The solenoid itself has failed.
TCU Control Circuit
TCU output for reverse inhibit has a fault.
Speed Sensor Signal
The speed sensor signal used by reverse inhibit is incorrect.
Why we don't list the exact part: A P0801 code tells you what's happening but not why. Replacing parts based on the code alone is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0801 and Your MOT
A stored P0801 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure under current MOT standards. Even if the light temporarily clears, the code remains in ECU memory and can be read by testers.
Get the fault diagnosed and repaired first, then have the code cleared and confirm the light stays off before booking your MOT.