P0861
Gear Shift Control Module A Communication Circuit Low
P0861 is an OBD-II diagnostic trouble code meaning: Gear Shift Control Module A Communication Circuit Low. Common causes: open or short circuit in tcm communication circuit, poor contact in tcm connectors. Estimated repair cost: $56–278.
Symptoms
- Incorrect gear shifting
- Difficulties when shifting gears
- Transmission transition to emergency mode
- Check Engine light comes on
- Power Loss
Causes
- Open or short circuit in TCM communication circuit
- Poor contact in TCM connectors
- Shift control module malfunction
- TCM power or ground problems
- PCM (main control unit) malfunction
How to Fix
- Check the integrity of wires and connectors in the TCM communication circuit
- Check TCM supply voltage and ground
- Scan the TCM for additional trouble codes
- Replace the shift control module if necessary.
- Check and update PCM software if necessary
Related codes
Error P0861 by Vehicle Brand
FAQ
What does the P0861 code mean?
P0861 is an OBD-II diagnostic trouble code that indicates: Gear Shift Control Module A Communication Circuit Low
What causes a P0861 error code?
The most common causes of P0861 include: Open or short circuit in TCM communication circuit; Poor contact in TCM connectors; Shift control module malfunction; TCM power or ground problems.
How do I fix a P0861 diagnostic trouble code?
To fix P0861: Check the integrity of wires and connectors in the TCM communication circuit. Check TCM supply voltage and ground. Scan the TCM for additional trouble codes. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0861?
Do not drive — repair immediately
How much does it cost to fix P0861?
The estimated repair cost for P0861 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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