P0886

TCM Power Relay Control Circuit Low

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Unstable gearbox operation
Difficulty shifting gears
Check Engine Light Is On
The gearbox goes into emergency mode
Loss of engine power

Causes

Faulty TCM power relay
Open or short circuit in the relay control circuit
Poor contact in control circuit connectors
Transmission control module (TCM) malfunction
TCM power or ground problems

How to Fix

Check TCM power relay for faults
Check the integrity of the relay control circuit
Inspect connectors and contacts for corrosion or damage
Check voltage and ground at TCM
Replace relay or TCM if necessary

Related codes

P0885 P0887 P0888