Fault Code P0866
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0866
Transmission Control Module (TCM) Communication Circuit High
This code indicates that a high voltage has been detected in the communication circuit between the Transmission Control Module (TCM) and other vehicle components.
Part Details
Part Name
Transmission Control Module (TCM), TCM Wiring
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪800 - ₪3000
Engine Location
Engine compartment/Transmission
Symptoms
- Incorrect gear engagement
- Check Engine Light on
- Transmission in limp mode
- Difficulty engaging gears
Possible Causes
- 1Wiring short to voltage
- 2Loose connections or corrosion
- 3Faulty TCM itself
- 4Faulty Powertrain Control Module (PCM)
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