P0865
TCM Communication Circuit Low
P0865 is an OBD-II diagnostic trouble code meaning: TCM Communication Circuit Low. Common causes: open or short circuit in the tcm communication circuit, bad contacts in connectors. Estimated repair cost: $56–167.
Symptoms
- Incorrect gear shifting
- Transmission transition to emergency mode
- Check Engine Light Illuminates
- Reduced engine power
- Problems with cruise control
Causes
- Open or short circuit in the TCM communication circuit
- Bad contacts in connectors
- TCM module malfunction
- Problems with power supply or grounding of the TCM module
- Malfunction of other related modules (e.g. engine ECU)
How to Fix
- Check the integrity of the TCM communication circuit
- Inspect and clean the contacts in the connectors
- Check the power supply and grounding of the TCM module
- Scan other modules for errors
- If necessary, replace the TCM module
Related codes
Error P0865 by Vehicle Brand
FAQ
What does the P0865 code mean?
P0865 is an OBD-II diagnostic trouble code that indicates: TCM Communication Circuit Low
What causes a P0865 error code?
The most common causes of P0865 include: Open or short circuit in the TCM communication circuit; Bad contacts in connectors; TCM module malfunction; Problems with power supply or grounding of the TCM module.
How do I fix a P0865 diagnostic trouble code?
To fix P0865: Check the integrity of the TCM communication circuit. Inspect and clean the contacts in the connectors. Check the power supply and grounding of the TCM module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0865?
Limited driving only, diagnose soon
How much does it cost to fix P0865?
The estimated repair cost for P0865 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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