P0891
TCM Power Relay Sense Circuit High
P0891 is an OBD-II diagnostic trouble code meaning: TCM Power Relay Sense Circuit High. Common causes: faulty tcm relay, damage to the relay circuit wiring harness. Estimated repair cost: $6–56.
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
Error P0891 by Vehicle Brand
FAQ
What does the P0891 code mean?
P0891 is an OBD-II diagnostic trouble code that indicates: TCM Power Relay Sense Circuit High
What causes a P0891 error code?
The most common causes of P0891 include: Faulty TCM relay; Damage to the relay circuit wiring harness; Short circuit in the circuit; Problems with voltage in the on-board network.
How do I fix a P0891 diagnostic trouble code?
To fix P0891: 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. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0891?
Limited driving only, diagnose soon
How much does it cost to fix P0891?
The estimated repair cost for P0891 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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