P1274 – BMW DTC

BMW DTC P1274 – Boost Pressure Positioner Supply Voltage Too Low (Bank 1)

DTC P1274 meaning on BMW

DTC P1274 on a BMW indicates that the Boost Pressure Positioner Supply Voltage is too low in Bank 1. This fault code is typically triggered when the engine control module detects a voltage level below the specified threshold for the boost pressure positioner in Bank 1.

BMW DTC P1274 symptoms

Symptoms of DTC P1274 on a BMW may include:

• Reduced engine performance
• Lack of power
• Engine stalling
• Check Engine Light (CEL) illuminated on the dashboard

BMW DTC P1274 causes

The common causes of DTC P1274 on a BMW include:

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

BMW DTC P1274 seriousness

DTC P1274 should not be ignored as it can lead to poor engine performance and potential drivability issues. Driving with this fault code present may cause further damage to engine components over time.

How to diagnose DTC P1274 on BMW

To diagnose DTC P1274 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the boost pressure positioner and its wiring for any visible damage or corrosion
3. Check the voltage supply to the boost pressure positioner using a multimeter
4. Perform a visual inspection of the connectors and wiring related to the boost pressure positioner

How to fix DTC P1274 on BMW

To fix DTC P1274 on a BMW, you can try the following solutions:

1. Replace the boost pressure positioner if it is found to be faulty
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 code and perform a test drive to verify the repair

How to erase DTC P1274 on BMW

To erase DTC P1274 on a BMW, you can use a diagnostic scanner to clear the fault code from the engine control module’s memory. After clearing the code, it is recommended to perform a test drive to ensure the fault does not reoccur.

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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