What does code P1804 mean?

Q: What does code P1804 mean?

Transmission 4-Wheel Drive High Indicator Circuit Failure. P1804 on Ford vehicles means the transmission control module (TCM) or four-wheel drive control module has detected a failure in the electrical circuit that illuminates the 4WD High indicator lamp. The module monitors the indicator circuit for expected voltage or continuity and sets this code when the circuit does not respond as commanded, typically due to an open, short, or faulty bulb/LED.

DTC codes / Ford codes / P1804

P1804 · FordTransmission 4-Wheel Drive High Indicator Circuit Failure

P1804 on Ford vehicles means the transmission control module (TCM) or four-wheel drive control module has detected a failure in the electrical circuit that illuminates the 4WD High indicator lamp. The module monitors the indicator circuit for expected voltage or continuity and sets this code when the circuit does not respond as commanded, typically due to an open, short, or faulty bulb/LED.

SystemPowertrain

Code typeFord specific

SeverityLow

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.