BMW DTC P1E4E – Drive Motor ‘B’ Inverter Transistor Power Supply Circuit High
DTC P1E4E meaning on BMW
DTC P1E4E on a BMW refers to a fault with the Drive Motor ‘B’ Inverter Transistor Power Supply Circuit. This diagnostic trouble code indicates that there is a high voltage condition detected in the power supply circuit of the drive motor ‘B’ inverter transistor.
BMW DTC P1E4E symptoms
Symptoms of DTC P1E4E on a BMW may include:
- Check Engine Light illuminated
- Reduced power or performance
- Vehicle may go into a limp mode
- Unusual noises or vibrations from the drivetrain
BMW DTC P1E4E causes
Common causes of DTC P1E4E on a BMW include:
- Faulty drive motor ‘B’ inverter transistor
- Short circuit or open circuit in the power supply circuit
- Issues with the wiring or connectors related to the drive motor ‘B’ inverter
BMW DTC P1E4E seriousness
The seriousness of DTC P1E4E on a BMW depends on the underlying cause. Ignoring this fault can lead to drivability issues and potential damage to the drivetrain components. It is recommended to address this issue promptly to prevent further damage.
How to diagnose DTC P1E4E on BMW
To diagnose DTC P1E4E on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the drive motor ‘B’ inverter transistor and related components for any visible damage
- Check the wiring and connectors for any signs of wear, corrosion, or loose connections
- Perform voltage and resistance tests on the power supply circuit to identify any abnormalities
How to fix DTC P1E4E on BMW
To fix DTC P1E4E on a BMW, the following steps may be taken:
- Replace the faulty drive motor ‘B’ inverter transistor
- Repair any short circuits or open circuits in the power supply circuit
- Repair or replace any damaged wiring or connectors related to the drive motor ‘B’ inverter
- Clear the fault codes and perform a test drive to ensure the issue has been resolved
How to erase DTC P1E4E on BMW
To erase DTC P1E4E on a BMW, the fault codes can be cleared using a diagnostic scanner. After the repairs have been made to address the underlying issue, the fault codes can be cleared to reset the Check Engine Light and ensure that the vehicle’s computer registers the problem as resolved.
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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