Fault Code P0666
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0666
ECM/PCM Internal Temperature Sensor 'B' Circuit
This code indicates a fault in the internal temperature sensor 'B' circuit within the Engine/Powertrain Control Module (ECM/PCM). This fault can affect engine performance.
Part Details
Part Name
Internal Temperature Sensor 'B'
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪400 - ₪1200
Engine Location
Inside ECM/PCM
Symptoms
- Check Engine Light on
- Hard starting
- Poor engine performance
- Increased fuel consumption
Possible Causes
- 1Faulty internal temperature sensor
- 2Wiring issues in the sensor circuit
- 3Short circuit in the circuit
- 4PCM/ECM malfunction
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