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P0891 – BMW DTC

BMW DTC P0891 – TCM Power Relay Sense Circuit High

DTC P0891 meaning on BMW

DTC P0891 on a BMW refers to the Transmission Control Module (TCM) Power Relay Sense Circuit High. This diagnostic trouble code indicates that the TCM is detecting a high voltage condition in the power relay sense circuit.

BMW DTC P0891 symptoms

Symptoms of DTC P0891 on a BMW may include:

  • Transmission shifting issues
  • Harsh or delayed shifting
  • Transmission stuck in a single gear
  • Check Engine Light (CEL) illuminated

BMW DTC P0891 causes

Common causes of DTC P0891 on a BMW include:

  • Faulty power relay
  • Wiring or connection issues in the power relay sense circuit
  • Defective TCM

BMW DTC P0891 seriousness

DTC P0891 should be addressed promptly as it can lead to drivability issues and potential damage to the transmission if left unresolved. Ignoring this code may result in further transmission problems and increased repair costs.

How to diagnose DTC P0891 on BMW

To diagnose DTC P0891 on a BMW, a mechanic would typically perform the following steps:

  1. Use a diagnostic scanner to retrieve the fault codes
  2. Inspect the power relay and related wiring for any visible damage or corrosion
  3. Check the power relay sense circuit for proper voltage levels
  4. Test the TCM for functionality

How to fix DTC P0891 on BMW

To fix DTC P0891 on a BMW, the following steps may be taken:

  1. Replace the faulty power relay if necessary
  2. Repair any damaged wiring or connections in the power relay sense circuit
  3. If the TCM is found to be defective, it may need to be replaced

How to erase DTC P0891 on BMW

After addressing the underlying issue causing DTC P0891 on a BMW, the fault code can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the vehicle’s computer to monitor the system for any new faults.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

← All BMW Diagnostic Trouble Codes

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