P1290 Cylinder Head Temperature Sensor Signal Less Than Self-Test Range
What does P1290 mean on a Ford?
P1290 — Cylinder Head Temperature Sensor Signal Less Than Self-Test Range. This Ford-enhanced code applies to F-150, Super Duty, Explorer, Escape with CHT sensors.
Common causes of P1290
- Shorted CHT sensor
- CHT signal wire shorted to ground
- Failed sensor reading a constant low
- Corroded connector bridging terminals
- PCM reference fault
How to fix P1290
- Inspect the CHT wiring for shorts to ground
- Disconnect the sensor and check whether the reading changes
- Test sensor resistance against temperature charts
- Clean or repair the connector
- Replace the sensor if resistance is out of specification