BMW DTC P20C6 – Reductant Heater ‘D’ Control Circuit Performance
DTC P20C6 meaning on BMW
DTC P20C6 for BMW refers to the Reductant Heater ‘D’ Control Circuit Performance. This diagnostic trouble code indicates that there is a performance issue with the control circuit of the Reductant Heater ‘D’ in the vehicle’s selective catalytic reduction (SCR) system. The SCR system is responsible for reducing harmful emissions by injecting a urea-based solution into the exhaust stream to convert nitrogen oxides into harmless nitrogen and water.
BMW DTC P20C6 symptoms
Symptoms of DTC P20C6 on a BMW may include the illumination of the check engine light on the dashboard. In some cases, the vehicle may go into a reduced power mode or fail to pass emissions testing. Additionally, there may be a noticeable decrease in fuel efficiency or performance.
BMW DTC P20C6 causes
The causes of DTC P20C6 on a BMW can vary, but common reasons include a faulty Reductant Heater ‘D’, damaged wiring or connectors in the control circuit, or a malfunctioning SCR system. Other potential causes may include software issues, sensor failures, or a faulty powertrain control module (PCM).
BMW DTC P20C6 seriousness
While DTC P20C6 may not cause immediate drivability issues, it is important to address this fault promptly to ensure the vehicle meets emissions standards and operates efficiently. Ignoring this fault could lead to increased emissions, reduced fuel economy, and potential long-term damage to the vehicle’s emissions control system.
How to diagnose DTC P20C6 on BMW
To diagnose DTC P20C6 on a BMW, a diagnostic scan tool capable of reading manufacturer-specific codes is required. The technician should inspect the Reductant Heater ‘D’ control circuit for any visible damage, test the heater element for proper operation, and check the wiring and connectors for continuity and resistance. Additionally, a thorough inspection of the SCR system and related components may be necessary to pinpoint the root cause of the fault.
How to fix DTC P20C6 on BMW
Fixing DTC P20C6 on a BMW typically involves repairing or replacing the faulty Reductant Heater ‘D’, addressing any damaged wiring or connectors, and ensuring proper operation of the SCR system. The technician may need to clear the fault code, perform a test drive to verify the repair, and reset the vehicle’s readiness monitors. If the issue persists, further diagnosis may be required to identify any underlying problems.
How to erase DTC P20C6 on BMW
To erase DTC P20C6 on a BMW, a diagnostic scan tool capable of clearing fault codes is needed. The technician should access the vehicle’s onboard diagnostic system, navigate to the fault code menu, and select the option to clear the stored codes. Once the DTC P20C6 has been successfully erased, the technician should perform a final check to ensure the fault code does not return and that the vehicle operates normally.
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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