P1290 — Cylinder Head Temperature Sensor Signal Less Than Self-Test Range

What Does P1290 Mean?

P1290 is a manufacturer-specific diagnostic trouble code: Cylinder Head Temperature Sensor Signal Less Than Self-Test Range. This code applies to FORD, LINCOLN, MERCURY, OTHER, DODGE vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1290

⚠️ Check Engine Light (MIL) illuminated
⚠️ Abnormal signal from Cylinder Head Temperature Sensor
⚠️ Related system may operate erratically
⚠️ Reduced engine performance

Common Causes

🔍 Cylinder Head Temperature Sensor producing abnormal signal
🔍 Electromagnetic interference affecting Cylinder Head Temperature Sensor signal
🔍 Wiring issue distorting Cylinder Head Temperature Sensor signal

Frequently Asked Questions

What does P1290 mean?

P1290 indicates: Cylinder Head Temperature Sensor Signal Less Than Self-Test Range. The vehicle's computer has detected that the Cylinder Head Temperature Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1290?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1290 for extended periods may cause additional problems.

How much does it cost to fix P1290?

Repair costs for P1290 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect Cylinder Head Temperature Sensor and related wiring
🔧 Replace faulty Cylinder Head Temperature Sensor

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1290: Cylinder Head Temperature Sensor Signal Less Than Self-Test Range