BMW DTC P0671 – Cylinder 1 Glow Plug Circuit/Open
DTC P0671 meaning on BMW
The Diagnostic Trouble Code (DTC) P0671 for BMW indicates a fault in the Cylinder 1 Glow Plug Circuit, specifically an open circuit. Glow plugs are used in diesel engines to help with cold starts by heating the air in the combustion chamber. When this code is triggered, it means that the Engine Control Module (ECM) has detected an issue with the glow plug circuit for cylinder 1.
BMW DTC P0671 symptoms
Symptoms of a DTC P0671 on a BMW may include:
- Hard starting, especially in cold weather
- Rough idling
- Decreased fuel efficiency
- Engine misfires
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P0671 causes
The common causes of a DTC P0671 on a BMW include:
- Defective glow plug in cylinder 1
- Wiring issues in the glow plug circuit
- Faulty glow plug relay
- Corrosion or poor connections in the circuit
BMW DTC P0671 seriousness
While a DTC P0671 may not cause immediate drivability issues, it can lead to starting problems and reduced engine performance, especially in cold conditions. Ignoring this code can potentially cause further damage to the engine over time.
How to diagnose DTC P0671 on BMW
To diagnose a DTC P0671 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the glow plug in cylinder 1 for physical damage or continuity
- Check the wiring and connections in the glow plug circuit for any signs of damage or corrosion
- Test the glow plug relay for proper operation
How to fix DTC P0671 on BMW
To fix a DTC P0671 on a BMW, you can take the following actions:
- Replace the faulty glow plug in cylinder 1
- Repair any damaged wiring or connections in the glow plug circuit
- Replace the glow plug relay if it is found to be defective
- Clear the fault code and test the vehicle to ensure the issue is resolved
How to erase DTC P0671 on BMW
To erase the DTC P0671 code on a BMW, you can use a diagnostic scanner to clear the code from the ECM’s memory. After fixing the underlying issue causing the fault code, clearing the code will reset the Check Engine Light and allow you to monitor the system for any recurring problems.
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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