What Does P0801 Mean?
The Reverse Inhibit Control Circuit has detected a malfunction. This circuit prevents the driver from accidentally shifting into reverse while the vehicle is moving above a certain speed. The PCM or TCM has identified an electrical fault in the solenoid or switch that controls the reverse gear lockout function. This is a safety-related circuit found primarily in manual transmission vehicles.
Common Causes
35%
Faulty reverse inhibit solenoid or relay
25%
Wiring open or short in the reverse inhibit circuit
20%
Defective vehicle speed sensor providing incorrect signal
12%
PCM or TCM internal circuit fault
8%
Corroded ground connection for the reverse inhibit circuit
Diagnostic Steps
1
Verify vehicle speed sensor data is accurate by comparing scan tool reading to actual vehicle speed during a test drive.
2
Test the reverse inhibit solenoid by commanding it on and off via bidirectional controls and checking for audible click and resistance change.
3
Measure resistance and continuity of the reverse inhibit solenoid circuit from the PCM connector to the solenoid.
4
Inspect wiring harness along its routing path for chafing, especially near the transmission and exhaust components.
5
Check for proper voltage supply and ground at the reverse inhibit solenoid connector with key on.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The Reverse Inhibit Control Circuit has detected a malfunction. This circuit prevents the driver from accidentally shifting into reverse while the vehicle is moving above a certain speed. The PCM or TCM has identified an electrical fault in the solenoid or switch that controls the reverse gear locko...
The most common cause of P0801 (Reverse Inhibit Control Circuit Malfunction) is: Faulty reverse inhibit solenoid or relay
Typical repair costs for P0801 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is generally safe to drive, but the reverse lockout safety feature may not function. Use extra caution when shifting, especially at speed. Do not attempt to force the shifter into reverse while moving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0801 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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