BMW DTC P1245 – Charge Air Temperature Sensor Circuit High
DTC P1245 meaning on BMW
The Diagnostic Trouble Code (DTC) P1245 on a BMW indicates that there is a high voltage condition detected in the charge air temperature sensor circuit. This sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for proper fuel delivery and combustion.
BMW DTC P1245 symptoms
Some common symptoms of DTC P1245 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance or power
- Potential rough idling or stalling
- Decreased fuel efficiency
BMW DTC P1245 causes
The high voltage condition in the charge air temperature sensor circuit can be caused by various factors, including:
- Faulty charge air temperature sensor
- Wiring or connector issues in the sensor circuit
- ECU (Engine Control Unit) malfunction
- Intermittent electrical problems
BMW DTC P1245 seriousness
While the vehicle may still be operable with DTC P1245, it is important to address this issue promptly to prevent potential engine damage or further complications. Ignoring this fault could lead to poor engine performance and increased fuel consumption.
How to diagnose DTC P1245 on BMW
To diagnose DTC P1245 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the charge air temperature sensor and its wiring for any visible damage or corrosion
- Test the sensor’s resistance and voltage output to determine if it is functioning correctly
- Check for any loose connections or shorts in the sensor circuit
How to fix DTC P1245 on BMW
Depending on the root cause of DTC P1245, the following steps may be taken to fix the issue:
- Replace the faulty charge air temperature sensor
- Repair or replace damaged wiring or connectors in the sensor circuit
- If the ECU is determined to be faulty, it may need to be reprogrammed or replaced
- Clear the fault code and reset the ECU after completing the repairs
How to erase DTC P1245 on BMW
Once the underlying issue causing DTC P1245 has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the ECU to relearn the corrected parameters. It is important to ensure that the repair has been successful before clearing 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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