What Does P1290 Mean?
During self-test diagnostics, the cylinder head temperature sensor signal did not reach the expected minimum range. This typically indicates the sensor is reading too cold or circuit voltage is too high.
Common Causes
35%
Open circuit in sensor signal wire or connector
30%
Failed cylinder head temperature sensor
20%
Corroded or damaged sensor connector terminals
15%
Poor sensor ground connection
Diagnostic Steps
1
Step 1: Locate and inspect cylinder head temperature sensor and connector for damage or corrosion
2
Step 2: Measure sensor resistance with connector disconnected and compare to temperature/resistance chart
3
Step 3: Check for continuity in signal wire from sensor to PCM
4
Step 4: Verify 5V reference voltage and ground at sensor connector
5
Step 5: Monitor sensor voltage in live data while heating sensor with heat gun to verify response
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
During self-test diagnostics, the cylinder head temperature sensor signal did not reach the expected minimum range. This typically indicates the sensor is reading too cold or circuit voltage is too high.
The most common cause of P1290 (Cylinder Head Temperature Sensor Signal Less Than Self-Test Range) is: Open circuit in sensor signal wire or connector
Typical repair costs for P1290 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive but PCM may use incorrect fuel and timing strategies, potentially causing overheating or poor performance. Monitor temperature gauge closely.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1290 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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