P0888

TCM Power Relay Sense Circuit

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–33 (est.)

Symptoms

Gear shifting problems
The gearbox goes into emergency mode
Check Engine Light Is On
Difficulty starting the engine
Power Loss

Causes

Faulty TCM power relay
Open or short circuit in the relay circuit
Poor contact in TCM connectors
TCM module malfunction
Wiring Harness Problems

How to Fix

Check the condition of the TCM power relay
Inspect the power circuit for damage
Check contacts in TCM connectors
Test TCM module
Replace relay or repair wiring if necessary

Related codes

P0887 P0889 P0890