P1804
Transmission 4-Wheel Drive High Indicator Circuit Failure
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)
Symptoms
- 4WD indicator does not light up on dashboard
- The 4WD indicator is constantly on even when the 4WD is turned off
- 4WD indicator flashes
- Other transmission warnings may appear on your dashboard
Causes
- Open or short circuit in the indicator circuit
- 4WD indicator lamp malfunction
- Problems with the wiring harness or connectors
- Transmission control module (TCM) malfunction
- Problems with the drive mode switch
How to Fix
- Check the condition of the 4WD indicator lamp
- Check the integrity of the wiring and connectors in the indicator circuit
- Check the voltage in the indicator circuit
- Scan the transmission control module for other errors
- If necessary, replace faulty components