P0801 Code: Reverse Inhibit Control Circuit/Open
🟠 Moderate severity · drivable
Drivable, but the reverse inhibit system is not working, so reverse may engage unexpectedly or not at all.
What P0801 means
The reverse inhibit solenoid is meant to stop the transmission from shifting into reverse while the car is moving forward at speed. This code means the circuit for that solenoid is open or faulty, so the protection may not work and reverse gear behavior can become unpredictable.
Symptoms
- Check engine light is on
- Transmission shifts into reverse while moving forward
- Reverse gear does not engage
- Harsh engagement into reverse
- Transmission warning message on the dash
Common causes
- most common: Faulty reverse inhibit solenoid
- common: Open or damaged wiring in the circuit
- common: Loose or corroded connector
- rare: Faulty transmission control module
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and repair the wiring and connector | Yes | $50–150 |
| Replace the reverse inhibit solenoid | Mechanic | $150–400 |
| Replace the transmission control module if faulty | Mechanic | $500–1200 |
Frequently asked questions
Can I drive with a P0801 code?
Yes, but be careful: the system that blocks reverse at speed is off, so the shifter could go into reverse while moving. Drive gently and fix it soon.
What does reverse inhibit do?
It prevents the transmission from engaging reverse gear while the vehicle is moving forward fast, protecting the gearbox from damage.
How much does it cost to fix P0801?
A wiring repair runs about $50–$150, and replacing the solenoid is typically $150–$400 with labor.
Related codes
P0700
P0700 Code: Transmission Control System Malfunction
P0705P0705 Code: Transmission Range Sensor Circuit Malfunction (PRNDL Input)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.