P0891 OBD-II: TCM Power Relay Sense Circuit High
P0891 Severity
Will P0891 go away on its own?
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
What causes OBD-II fault code P0891?
If the Transmission Control Module (TCM) does not receive the correct amount of voltage, it will send a message to the engine control module (PCM) to set code P0891.
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OBD II Fault Code
- OBD II P0891
OBD-II Code Transmission may not shift properly is defined as a TCM Power Relay Sense Circuit High
If the Transmission Control Module (TCM) does not receive the correct amount of voltage, it will send a message to the engine control module (PCM) to set code P0891.
Transmission may not shift properly Symptoms
- Increased fuel consumption
- Transmission may not shift properly
Common Problems That Trigger the P0891 Code
- Transmission Control Module (TCM) failure
- Transmission Control Module (TCM) relay failure
- Wiring issue
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