BMW DTC P142A – Crankcase Ventilation Heater Relay Circuit High
DTC P142A meaning on BMW
The DTC P142A code on a BMW indicates an issue with the Crankcase Ventilation Heater Relay Circuit being detected as high. This means that there is a problem with the electrical circuit related to the crankcase ventilation heater relay, causing it to operate at a higher than normal voltage level.
BMW DTC P142A symptoms
Symptoms of the DTC P142A code on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Reduced engine performance
- Increased fuel consumption
- Engine stalling or rough idling
BMW DTC P142A causes
Common causes of the DTC P142A code on a BMW include:
- Faulty crankcase ventilation heater relay
- Short circuit or open circuit in the relay circuit
- Corroded or damaged wiring connections
- Defective ECM (Engine Control Module)
BMW DTC P142A seriousness
The DTC P142A code should not be ignored as it can lead to potential engine performance issues and increased fuel consumption. Continuing to drive the vehicle with this fault unresolved may cause further damage to engine components.
How to diagnose DTC P142A on BMW
To diagnose the DTC P142A code on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the ECM
- Inspect the crankcase ventilation heater relay and related wiring for any visible damage
- Test the relay circuit for proper voltage levels and continuity
- Check for any other related fault codes that may provide additional information
How to fix DTC P142A on BMW
To fix the DTC P142A code on a BMW, the following steps may be taken:
- Replace the faulty crankcase ventilation heater relay
- Repair any damaged wiring connections or circuits
- Clear the fault codes from the ECM memory
- Perform a test drive to ensure the issue has been resolved
How to erase DTC P142A on BMW
To erase the DTC P142A code on a BMW, the fault codes can be cleared using a diagnostic scanner. After the necessary repairs have been made and the issue resolved, the mechanic can use the scanner to clear the fault codes from the ECM memory, effectively erasing the DTC P142A 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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