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P0677 – BMW DTC

BMW DTC P0677 – Cylinder 7 Glow Plug Circuit/Open

DTC P0677 meaning on BMW

The Diagnostic Trouble Code (DTC) P0677 for BMW indicates a fault in the Cylinder 7 Glow Plug Circuit, specifically an open circuit. This means that the powertrain control module (PCM) has detected an issue with the electrical circuit responsible for controlling the glow plug in cylinder 7.

BMW DTC P0677 symptoms

Symptoms of a DTC P0677 in a BMW may include:

  • Difficulty starting the engine, especially in cold weather
  • Engine misfires or rough idling
  • Decreased fuel efficiency
  • Illumination of the Check Engine Light

BMW DTC P0677 causes

Common causes of a DTC P0677 in a BMW include:

  • Defective glow plug in cylinder 7
  • Wiring issues such as a broken or loose connection
  • Faulty glow plug relay
  • PCM software issues

BMW DTC P0677 seriousness

While a DTC P0677 may not cause immediate drivability issues, it can lead to starting problems and potential engine damage if left unresolved. It is important to address this issue promptly to ensure proper engine performance and efficiency.

How to diagnose DTC P0677 on BMW

To diagnose a DTC P0677 on a BMW, you can follow these steps:

  1. Use a diagnostic scanner to retrieve the fault code and verify the specific cylinder affected.
  2. Inspect the glow plug in cylinder 7 for signs of damage or wear.
  3. Check the wiring and connections related to the glow plug circuit for any faults.
  4. Test the glow plug relay for proper operation.
  5. If necessary, perform a continuity test on the circuit to identify any open circuits.

How to fix DTC P0677 on BMW

To fix a DTC P0677 on a BMW, you can consider the following steps:

  1. Replace the defective glow plug in cylinder 7.
  2. Repair any damaged wiring or connections in the glow plug circuit.
  3. Replace the faulty glow plug relay if necessary.
  4. Clear the fault code and reset the PCM after completing the repairs.

How to erase DTC P0677 on BMW

To erase a DTC P0677 on a BMW, you can use a diagnostic scanner to clear the fault code from the PCM’s memory. After completing the necessary repairs and ensuring that the issue has been resolved, you can reset the PCM to remove the DTC and turn off the Check Engine Light.

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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