BMW DTC P142C – Crankcase Ventilation Heater Relay Open Circuit
DTC P142C meaning on BMW
The DTC P142C on a BMW refers to a fault with the Crankcase Ventilation Heater Relay Open Circuit. This diagnostic trouble code indicates that there is an issue with the relay responsible for controlling the crankcase ventilation heater system.
BMW DTC P142C symptoms
Symptoms of the BMW DTC P142C may include:
- Check Engine Light illuminated on the dashboard
- Reduced engine performance
- Possible rough idling or stalling
BMW DTC P142C causes
Common causes of the BMW DTC P142C include:
- Faulty crankcase ventilation heater relay
- Wiring or connection issues in the relay circuit
- Defective crankcase ventilation heater
BMW DTC P142C seriousness
The seriousness of the BMW DTC P142C code lies in the potential impact on engine performance and emissions. Ignoring this fault can lead to further engine issues and increased emissions output.
How to diagnose DTC P142C on BMW
To diagnose the DTC P142C on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the crankcase ventilation heater relay for any visible damage
- Check the wiring and connections related to the relay circuit
- Test the functionality of the crankcase ventilation heater
How to fix DTC P142C on BMW
To fix the DTC P142C on a BMW, you can consider the following actions:
- Replace the faulty crankcase ventilation heater relay
- Repair any damaged wiring or connections in the relay circuit
- If the crankcase ventilation heater is defective, replace it
How to erase DTC P142C on BMW
To erase the DTC P142C on a BMW, you can clear the fault code using a diagnostic scanner. After fixing the underlying issue, you can reset the code to turn off the Check Engine Light and ensure the fault is no longer present.
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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