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P20C7 – BMW DTC

BMW DTC P20C7 – Reductant Heater ‘D’ Control Circuit Low

DTC P20C7 meaning on BMW

DTC P20C7 for BMW refers to the Reductant Heater ‘D’ Control Circuit Low. This diagnostic trouble code indicates that the control circuit for the reductant heater ‘D’ is operating at a lower voltage level than expected.

BMW DTC P20C7 symptoms

Symptoms of DTC P20C7 on a BMW may include:

  • Check Engine Light illuminated
  • Reduced engine performance
  • Possible increase in emissions

BMW DTC P20C7 causes

Common causes of DTC P20C7 on a BMW include:

  • Faulty reductant heater ‘D’
  • Wiring issues in the control circuit
  • Corrosion or poor connections in the circuit

BMW DTC P20C7 seriousness

The seriousness of DTC P20C7 on a BMW can vary. While it may not cause immediate drivability issues, prolonged presence of this fault code can lead to increased emissions and potential long-term damage to the emissions control system.

How to diagnose DTC P20C7 on BMW

To diagnose DTC P20C7 on a BMW, you can perform the following steps:

  1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
  2. Inspect the reductant heater ‘D’ and its wiring for any visible damage or corrosion
  3. Check the voltage levels in the control circuit using a multimeter

How to fix DTC P20C7 on BMW

To fix DTC P20C7 on a BMW, you may need to:

  1. Replace the faulty reductant heater ‘D’
  2. Repair any damaged wiring or connections in the control circuit
  3. Clear the fault code and perform a test drive to ensure the issue is resolved

How to erase DTC P20C7 on BMW

To erase DTC P20C7 on a BMW, you can:

  1. Use a diagnostic scanner to clear the fault code
  2. Perform a drive cycle to ensure the fault does not return

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

← All BMW Diagnostic Trouble Codes

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