BMW DTC P2420 – EVAP System Switching Valve Control Circuit High
DTC P2420 meaning on BMW
The Diagnostic Trouble Code (DTC) P2420 for BMW refers to the ¨EVAP System Switching Valve Control Circuit High.¨ This code indicates that there is a high voltage condition detected in the control circuit of the EVAP system’s switching valve.
BMW DTC P2420 symptoms
Symptoms of DTC P2420 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Decreased fuel efficiency
- Engine may run rough or stall
- Increased emissions
BMW DTC P2420 causes
Common causes of DTC P2420 on a BMW include:
- Faulty EVAP system switching valve
- Open or short circuit in the switching valve control circuit
- Corroded or damaged wiring/connectors in the EVAP system
- Defective Engine Control Module (ECM)
BMW DTC P2420 seriousness
While DTC P2420 may not cause immediate drivability issues, it is important to address this code promptly to prevent potential damage to the vehicle’s emissions system and ensure optimal engine performance.
How to diagnose DTC P2420 on BMW
To diagnose DTC P2420 on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the EVAP system switching valve and its wiring for any visible damage
- Check the resistance of the switching valve and the control circuit using a multimeter
- Inspect the ECM for any signs of damage or malfunction
How to fix DTC P2420 on BMW
To fix DTC P2420 on a BMW, you can try the following solutions:
- Replace the faulty EVAP system switching valve
- Repair any open or short circuits in the control circuit
- Repair or replace any corroded or damaged wiring/connectors in the EVAP system
- If necessary, replace the Engine Control Module (ECM)
How to erase DTC P2420 on BMW
To erase DTC P2420 on a BMW, you can use a diagnostic scanner to clear the code after the underlying issue has been resolved. This will reset the Check Engine Light and allow you to monitor the system for any recurring faults.
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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