Fault Code P0891
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0891
TCM Power Relay Stuck On
This code indicates that the Transmission Control Module (TCM) power relay remains 'on' permanently, even when it should be off. This can lead to battery drain or other electrical issues.
Part Details
Part Name
TCM Relay
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪150 - ₪600
Engine Location
Fuse box/Engine compartment
Symptoms
- Battery drains
- Transmission remains active after vehicle shutdown
- Check Engine Light illuminated
- General electrical problems
Possible Causes
- 1Faulty TCM relay (stuck closed)
- 2Short to positive in control circuit
- 3ECM or TCM issue
- 4Faulty wiring
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