P0891

TCM Power Relay Sense Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$6–56 (est.)

Symptoms

Transmission of the gearbox into emergency mode
Gear shifting problems
Check Engine light comes on
Loss of engine power
Unstable engine operation at idle

Causes

Faulty TCM relay
Damage to the relay circuit wiring harness
Short circuit in the circuit
Problems with voltage in the on-board network
TCM module malfunction

How to Fix

Check the condition of the TCM relay and replace if necessary.
Check the integrity of the relay circuit wiring harness
Check the voltage in the on-board network
Check connections and contacts in the relay circuit
Replace TCM if necessary

Related codes

P0890 P0892 P0893