What Does P1293 Mean?
During self-test diagnostics, the cylinder head temperature sensor signal was outside the expected range. This is a broader diagnostic code indicating the sensor or circuit failed validation testing.
Common Causes
35%
Failed cylinder head temperature sensor
25%
Intermittent wiring connection or damaged harness
20%
Corroded sensor connector terminals
12%
Incorrect sensor for application installed
8%
PCM signal processing circuit fault
Diagnostic Steps
1
Step 1: Inspect cylinder head temperature sensor and connector for physical damage or corrosion
2
Step 2: Compare sensor part number to specification to ensure correct sensor is installed
3
Step 3: Measure sensor resistance at various temperatures and compare to manufacturer chart
4
Step 4: Test circuit continuity and voltage reference at PCM connector
5
Step 5: Substitute known-good sensor to verify fault isolation
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
During self-test diagnostics, the cylinder head temperature sensor signal was outside the expected range. This is a broader diagnostic code indicating the sensor or circuit failed validation testing.
The most common cause of P1293 (Cylinder Head Temp Sensor Out Of Self Test Range) is: Failed cylinder head temperature sensor
Typical repair costs for P1293 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but PCM may not properly control fuel enrichment or cooling fan operation. Monitor coolant temperature and avoid extended high-load operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1293 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Cooling / Temperature Management
Difficulty
Type
Manufacturer
Recommended Tools
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