C057A – BMW DTC

BMW DTC C057A – Brake Booster Temperature Sensor ‘B’ Circuit High

DTC C057A meaning on BMW

DTC C057A for BMW refers to the Brake Booster Temperature Sensor ‘B’ Circuit High. This diagnostic trouble code indicates that the brake booster temperature sensor ‘B’ circuit is reading a high voltage signal, which may be out of the specified range set by the vehicle’s ECM (Engine Control Module).

BMW DTC C057A symptoms

Symptoms of DTC C057A on a BMW may include:

• Check Engine Light (MIL) illuminated on the dashboard
• Decreased brake performance or responsiveness
• Abnormal brake pedal feel

BMW DTC C057A causes

The potential causes of DTC C057A on a BMW can include:

• Faulty brake booster temperature sensor ‘B’
• Wiring or connector issues in the brake booster temperature sensor circuit
• ECM (Engine Control Module) malfunction

BMW DTC C057A seriousness

DTC C057A should not be ignored as it can affect the proper functioning of the brake system in your BMW. It is important to address this issue promptly to ensure the safety and performance of your vehicle.

How to diagnose DTC C057A on BMW

To diagnose DTC C057A on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM.
2. Inspect the brake booster temperature sensor ‘B’ and its wiring for any visible damage or corrosion.
3. Test the brake booster temperature sensor ‘B’ using a multimeter to check for proper resistance values.
4. Check the ECM for any related fault codes or malfunctions.

How to fix DTC C057A on BMW

To fix DTC C057A on a BMW, you can try the following:

1. Replace the faulty brake booster temperature sensor ‘B’ if it is found to be defective.
2. Repair any damaged wiring or connectors in the brake booster temperature sensor circuit.
3. If the ECM is determined to be the issue, it may need to be reprogrammed or replaced by a qualified technician.

How to erase DTC C057A on BMW

To erase DTC C057A on a BMW, you can:

1. Use a diagnostic scanner to clear the fault codes stored in the ECM.
2. After fixing the underlying issue causing the DTC, you can reset the ECM by disconnecting the battery for a few minutes.
3. Ensure that the repair has been successful by driving the vehicle and checking for any recurrence of the fault code.

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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