BMW DTC P303E – Controlled Upper Air Shutter Supply Voltage
DTC P303E meaning on BMW
DTC P303E on a BMW refers to a fault with the Controlled Upper Air Shutter Supply Voltage. This diagnostic trouble code indicates that there is an issue with the supply voltage to the upper air shutter control system in the vehicle.
BMW DTC P303E symptoms
Symptoms of DTC P303E on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Reduced engine performance
- Engine stalling or rough idling
- Poor fuel efficiency
BMW DTC P303E causes
Common causes of DTC P303E on a BMW include:
- Faulty upper air shutter control module
- Wiring or connector issues in the upper air shutter control circuit
- Low voltage supply to the upper air shutter system
BMW DTC P303E seriousness
While DTC P303E may not always result in immediate drivability issues, it is important to address this fault promptly to prevent potential engine performance issues and further damage to the vehicle.
How to diagnose DTC P303E on BMW
To diagnose DTC P303E on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the upper air shutter control module for any visible damage
- Check the wiring and connectors in the upper air shutter control circuit for continuity and proper connections
- Test the voltage supply to the upper air shutter system
How to fix DTC P303E on BMW
To fix DTC P303E on a BMW, the following steps may be taken:
- Replace the faulty upper air shutter control module if necessary
- Repair any damaged wiring or connectors in the upper air shutter control circuit
- Ensure proper voltage supply to the upper air shutter system
- Clear the fault code and perform a test drive to verify the repair
How to erase DTC P303E on BMW
To erase DTC P303E on a BMW, the fault code can be cleared using a diagnostic scanner. After addressing the underlying issue causing the fault code, the code can be cleared to reset the Check Engine Light and ensure that the repair was successful.
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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