BMW DTC P068E – Cylinder 8 Glow Plug Control Circuit Low
DTC P068E meaning on BMW
The DTC P068E code on a BMW indicates a low voltage condition in the cylinder 8 glow plug control circuit. This fault code is specific to the glow plug system, which is responsible for aiding in cold engine starting by preheating the combustion chamber.
BMW DTC P068E symptoms
Symptoms of a DTC P068E code on a BMW may include:
- Hard starting in cold weather
- Rough idling during cold starts
- Decreased fuel efficiency
- Illuminated check engine light
BMW DTC P068E causes
Common causes of a DTC P068E code on a BMW include:
- Defective glow plug in cylinder 8
- Wiring or connection issues in the glow plug circuit
- Faulty glow plug control module
- Corrosion or poor contact in the electrical connections
BMW DTC P068E seriousness
While a DTC P068E code may not cause immediate drivability issues, it can lead to starting problems and reduced engine performance, especially in cold weather conditions. Ignoring this fault code can potentially lead to further damage to the engine or emissions system.
How to diagnose DTC P068E on BMW
To diagnose a DTC P068E on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the glow plug in cylinder 8 for proper operation
- Check the wiring and connections in the glow plug circuit for any damage or corrosion
- Test the glow plug control module for functionality
How to fix DTC P068E on BMW
To fix a DTC P068E on a BMW, the following steps may be taken:
- Replace the faulty glow plug in cylinder 8
- Repair any damaged wiring or connections in the glow plug circuit
- Replace the glow plug control module if necessary
- Clear the fault code and test the vehicle to ensure the issue is resolved
How to erase DTC P068E on BMW
To erase a DTC P068E code on a BMW, a diagnostic scanner can be used to clear the code from the vehicle’s engine control module. After the repair has been completed, the code can be cleared, and the vehicle can be driven to verify that the issue has been resolved.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.