What causes P1289 on a Ford?

Open circuit in the cylinder head temperature sensor wiring Failed CHT sensor reading out of range Corroded or loose CHT connector Actual engine overheating driving the sensor high PCM reference voltage fault

How do I fix P1289 on a Ford?

Confirm actual engine temperature before any electrical diagnosis Inspect the CHT wiring and connector for opens and corrosion Compare the CHT reading to coolant temperature on a cold engine — they should match Test sensor resistance against Ford temperature charts Replace the CHT sensor if the circuit tests good but the reading stays high

P1289 Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range

Q: What does P1289 mean on a Ford?

P1289 — Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range. Applies to F-150, Super Duty, Explorer, Escape with cylinder head temperature sensors.

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: F-150, Super Duty, Explorer, Escape with cylinder head temperature sensors

What does P1289 mean on a Ford?

P1289 — Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range. This Ford-enhanced code applies to F-150, Super Duty, Explorer, Escape with cylinder head temperature sensors.

Common causes of P1289

Open circuit in the cylinder head temperature sensor wiring
Failed CHT sensor reading out of range
Corroded or loose CHT connector
Actual engine overheating driving the sensor high
PCM reference voltage fault

How to fix P1289

Confirm actual engine temperature before any electrical diagnosis
Inspect the CHT wiring and connector for opens and corrosion
Compare the CHT reading to coolant temperature on a cold engine — they should match
Test sensor resistance against Ford temperature charts
Replace the CHT sensor if the circuit tests good but the reading stays high