P0813 – BMW DTC

BMW DTC P0813 – Reverse Output Circuit

DTC P0813 meaning on BMW

DTC P0813 on a BMW refers to a fault in the reverse output circuit. This diagnostic trouble code indicates that there is an issue with the signal being sent from the transmission control module (TCM) to the engine control module (ECM) when the vehicle is in reverse gear.

BMW DTC P0813 symptoms

Symptoms of a DTC P0813 on a BMW may include:

• Difficulty shifting into reverse gear
• Delayed engagement when shifting into reverse
• Harsh shifting when moving in reverse
• Check Engine Light (CEL) illuminated on the dashboard

BMW DTC P0813 causes

Common causes of a DTC P0813 on a BMW include:

• Faulty reverse light switch
• Wiring issues in the reverse output circuit
• Defective transmission control module (TCM)
• Faulty engine control module (ECM)

BMW DTC P0813 seriousness

While a DTC P0813 may not always result in immediate drivability issues, it is important to address this fault promptly. Ignoring this code can lead to further transmission problems and potential safety concerns when reversing the vehicle.

How to diagnose DTC P0813 on BMW

To diagnose a DTC P0813 on a BMW, a mechanic may perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and related data
2. Inspect the reverse light switch and its wiring for any visible damage
3. Check the connections between the TCM and ECM for proper continuity
4. Perform a thorough inspection of the reverse output circuit components

How to fix DTC P0813 on BMW

To fix a DTC P0813 on a BMW, the following steps may be taken:

1. Replace the faulty reverse light switch if necessary
2. Repair any damaged wiring in the reverse output circuit
3. Address any issues with the TCM or ECM as needed
4. Clear the fault code and test the vehicle to ensure the issue has been resolved

How to erase DTC P0813 on BMW

To erase a DTC P0813 on a BMW, follow these steps:

1. Use a diagnostic scanner to access the vehicle’s ECM
2. Select the option to clear the fault codes stored in the system
3. Confirm the deletion of the DTC P0813 code
4. Turn off the ignition and restart the vehicle to ensure the code has been successfully erased

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

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