BMW DTC P0118 – Engine Coolant Temperature Sensor 1 Circuit High
DTC P0118 meaning on BMW
The Diagnostic Trouble Code (DTC) P0118 for BMW indicates a high voltage condition in the Engine Coolant Temperature (ECT) Sensor 1 circuit. The ECT sensor is responsible for monitoring the temperature of the engine coolant and providing this information to the engine control module (ECM) for proper fuel delivery and ignition timing.
BMW DTC P0118 symptoms
Symptoms of a DTC P0118 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Inaccurate temperature gauge readings
- Engine running too rich or too lean
- Potential engine overheating
BMW DTC P0118 causes
Common causes of a DTC P0118 on a BMW include:
- Failed Engine Coolant Temperature (ECT) sensor
- Wiring or connector issues in the ECT sensor circuit
- ECM software or hardware problems
BMW DTC P0118 seriousness
While a DTC P0118 may not cause immediate drivability issues, it can lead to poor engine performance and potential long-term damage if left unresolved. It is important to address this code promptly to prevent further complications.
How to diagnose DTC P0118 on BMW
To diagnose a DTC P0118 on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the ECT sensor and its wiring for any visible damage or corrosion
- Check the ECT sensor resistance with a multimeter to verify its functionality
- Test the ECT sensor signal at the ECM connector for proper voltage readings
How to fix DTC P0118 on BMW
To fix a DTC P0118 on a BMW, you can take the following actions:
- Replace the Engine Coolant Temperature (ECT) sensor if it is faulty
- Repair any damaged wiring or connectors in the ECT sensor circuit
- Clear the fault code and perform a test drive to verify the repair
How to erase DTC P0118 on BMW
To erase a DTC P0118 on a BMW, you can use a diagnostic scanner to clear the fault code from the ECM’s memory. After clearing the code, it is recommended to perform a test drive to ensure the code does not return.
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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