BMW DTC P0851 – Park/Neutral Switch Input Circuit Low
DTC P0851 meaning on BMW
The DTC P0851 code on a BMW indicates a problem with the Park/Neutral Switch Input Circuit being detected as low. This switch is responsible for informing the vehicle’s computer whether the transmission is in the Park or Neutral position.
BMW DTC P0851 symptoms
Common symptoms of a DTC P0851 code on a BMW may include:
- Difficulty starting the vehicle
- Inability to shift out of Park
- Intermittent stalling
BMW DTC P0851 causes
The causes of a DTC P0851 code on a BMW can vary, but some common reasons include:
- Faulty Park/Neutral Switch
- Wiring issues in the Park/Neutral Switch circuit
- Corrosion or poor connections in the circuit
BMW DTC P0851 seriousness
While a DTC P0851 code may not always result in immediate drivability issues, it is important to address the problem promptly to avoid potential safety concerns and further damage to the vehicle’s transmission system.
How to diagnose DTC P0851 on BMW
Diagnosing a DTC P0851 code on a BMW typically involves:
- Using a diagnostic scanner to retrieve the fault code
- Inspecting the Park/Neutral Switch and its wiring for any visible damage
- Testing the switch for proper functionality
How to fix DTC P0851 on BMW
To fix a DTC P0851 code on a BMW, you may need to:
- Replace the faulty Park/Neutral Switch
- Repair any damaged wiring or connections in the circuit
- Clear the fault code and test the system for proper operation
How to erase DTC P0851 on BMW
To erase a DTC P0851 code on a BMW, you can:
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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