P0860

Gear Shift Control Module A Communication Circuit

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–222 (est.)

Symptoms

Gear shifting problems
Check Engine light comes on
The car goes into emergency mode
Reduced engine power
Unstable gearbox operation

Causes

Broken or damaged wires in the communication circuit
Poor contact in the control module connectors
Shift Control Module (TCM) malfunction
Problems with the engine control unit (ECU)
Short circuit in the circuit

How to Fix

Check the integrity of wires and connectors in the communication circuit
Clean TCM and ECU connector contacts
Check TCM power and ground
Scan the TCM for additional errors
Replace TCM if necessary

Related codes

P0861 P0862 P0863