P2799 – BMW DTC

BMW DTC P2799 – Electric/Auxiliary Transmission Fluid Pump Control Circuit High

DTC P2799 meaning on BMW

DTC P2799 on a BMW indicates a high voltage condition in the control circuit of the electric or auxiliary transmission fluid pump. This fault code is specific to the transmission system and is triggered when the powertrain control module (PCM) detects a voltage signal that exceeds the predetermined threshold.

BMW DTC P2799 symptoms

Symptoms associated with DTC P2799 in a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Transmission shifting issues
• Reduced fuel efficiency
• Transmission overheating

BMW DTC P2799 causes

The common causes of DTC P2799 on a BMW are:

• Faulty electric or auxiliary transmission fluid pump
• Short circuit or open circuit in the control circuit wiring
• Defective transmission fluid pump control module
• Corrosion or poor connections in the wiring harness

BMW DTC P2799 seriousness

Ignoring DTC P2799 in a BMW can lead to potential transmission damage and drivability issues. It is important to address this fault code promptly to prevent further damage to the transmission system and ensure safe vehicle operation.

How to diagnose DTC P2799 on BMW

To diagnose DTC P2799 on a BMW, a mechanic should perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the electric or auxiliary transmission fluid pump and its control circuit for any visible damage or corrosion
3. Check the wiring harness and connectors for loose connections or shorts
4. Test the transmission fluid pump control module for proper operation

How to fix DTC P2799 on BMW

To fix DTC P2799 on a BMW, the following steps can be taken:

1. Replace the faulty electric or auxiliary transmission fluid pump
2. Repair any damaged wiring or connectors in the control circuit
3. Replace the transmission fluid pump control module if necessary
4. Clear the fault code and perform a test drive to ensure the issue is resolved

How to erase DTC P2799 on BMW

To erase DTC P2799 on a BMW, follow these steps:

1. Use a diagnostic scanner to clear the fault code from the PCM memory
2. Perform a test drive to confirm that the fault code does not reappear
3. If the fault code returns, further diagnosis and repairs may be required

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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