P1277 – BMW DTC

BMW DTC P1277 – Boost Pressure Positioner Supply Voltage Too Low (Bank 2)

DTC P1277 meaning on BMW

The DTC P1277 code on a BMW indicates that the boost pressure positioner supply voltage is too low in Bank 2. This means that there is an issue with the voltage supply to the boost pressure positioner, which can affect the performance and efficiency of the turbocharging system in the vehicle.

BMW DTC P1277 symptoms

Symptoms of the BMW DTC P1277 code may include:

• Loss of engine power
• Poor acceleration
• Reduced fuel efficiency
• Check Engine Light (CEL) illuminated on the dashboard

BMW DTC P1277 causes

Common causes of the BMW DTC P1277 code include:

• Faulty boost pressure positioner
• Wiring or connector issues in the boost pressure positioner circuit
• Low voltage supply to the boost pressure positioner

BMW DTC P1277 seriousness

The DTC P1277 code should be addressed promptly as it can lead to reduced engine performance and potential long-term damage to the turbocharging system. Ignoring this issue may result in further complications and increased repair costs.

How to diagnose DTC P1277 on BMW

To diagnose the DTC P1277 code on a BMW, you can perform the following steps:

1. Use an OBD-II scanner to retrieve the fault codes and freeze frame data
2. Inspect the boost pressure positioner and its wiring for any visible damage or loose connections
3. Check the voltage supply to the boost pressure positioner using a multimeter
4. Perform a boost pressure system test to ensure proper functionality

How to fix DTC P1277 on BMW

To fix the DTC P1277 code on a BMW, you can try the following solutions:

1. Replace the faulty boost pressure positioner
2. Repair or replace any damaged wiring or connectors in the boost pressure positioner circuit
3. Ensure the voltage supply to the boost pressure positioner is within the specified range
4. Clear the fault codes and reset the Check Engine Light using an OBD-II scanner

How to erase DTC P1277 on BMW

To erase the DTC P1277 code on a BMW, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port
2. Access the scanner’s menu and select the option to clear fault codes
3. Follow the on-screen instructions to erase the DTC P1277 code
4. Once the code is cleared, start the vehicle to ensure the Check Engine Light is no longer illuminated

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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