BMW DTC P20D3 – Exhaust Aftertreatment Fuel Injector ‘B’ Control Circuit Low
DTC P20D3 meaning on BMW
DTC P20D3 on a BMW indicates a fault with the Exhaust Aftertreatment Fuel Injector ‘B’ control circuit. This means that the control module has detected a low voltage condition in the circuit that controls the fuel injector for the exhaust aftertreatment system.
BMW DTC P20D3 symptoms
Symptoms of DTC P20D3 on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Increased fuel consumption
- Possible exhaust smoke or odor
BMW DTC P20D3 causes
Common causes of DTC P20D3 on a BMW include:
- Faulty Exhaust Aftertreatment Fuel Injector ‘B’
- Wiring or connector issues in the control circuit
- Defective control module
BMW DTC P20D3 seriousness
DTC P20D3 should be addressed promptly as it can lead to reduced engine performance and potential damage to the exhaust aftertreatment system. Ignoring this fault may result in increased emissions and failed emissions tests.
How to diagnose DTC P20D3 on BMW
To diagnose DTC P20D3 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 Exhaust Aftertreatment Fuel Injector ‘B’ and its wiring for any visible damage
- Check the control circuit for proper voltage and continuity
- Test the control module for proper operation
How to fix DTC P20D3 on BMW
To fix DTC P20D3 on a BMW, the following steps may be taken:
- Replace the faulty Exhaust Aftertreatment Fuel Injector ‘B’
- Repair any damaged wiring or connectors in the control circuit
- If the control module is defective, it may need to be replaced or reprogrammed
How to erase DTC P20D3 on BMW
After the issue causing DTC P20D3 on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the Check Engine Light and erase the DTC from the vehicle’s memory.
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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