BMW DTC P3306 – Ignition Coil Cylinder 4 Circuit High or None-Impedance
DTC P3306 meaning on BMW
DTC P3306 on a BMW indicates an issue with the ignition coil for cylinder 4. The fault code specifically points to a high or none-impedance condition in the circuit related to the ignition coil for cylinder 4. This means that there is an abnormality in the electrical resistance or impedance in the circuit, which can affect the proper functioning of the ignition system for that particular cylinder.
BMW DTC P3306 symptoms
Symptoms of DTC P3306 on a BMW may include engine misfires, rough idling, loss of power, and potentially an illuminated check engine light on the dashboard. The vehicle may also experience poor fuel efficiency and overall performance issues due to the cylinder 4 ignition coil circuit problem.
BMW DTC P3306 causes
The common causes of DTC P3306 on a BMW include a faulty ignition coil for cylinder 4, damaged wiring or connectors in the ignition coil circuit, or a problem with the Engine Control Module (ECM). Additionally, corrosion, moisture ingress, or physical damage to the components can also lead to this fault code.
BMW DTC P3306 seriousness
Ignoring DTC P3306 on a BMW can lead to further engine performance issues, potential damage to the catalytic converter, and increased emissions. It is important to address this fault code promptly to prevent any long-term damage to the vehicle and ensure optimal engine operation.
How to diagnose DTC P3306 on BMW
To diagnose DTC P3306 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault code and perform a visual inspection of the ignition coil for cylinder 4, as well as the related wiring and connectors. Testing the resistance of the ignition coil and checking for any signs of damage or corrosion can help pinpoint the exact cause of the issue.
How to fix DTC P3306 on BMW
Fixing DTC P3306 on a BMW may involve replacing the ignition coil for cylinder 4 if it is found to be faulty. Additionally, repairing or replacing any damaged wiring or connectors in the circuit can help resolve the high or none-impedance condition. Ensuring proper connections and addressing any underlying issues with the ECM can also help fix this fault code.
How to erase DTC P3306 on BMW
After addressing the root cause of DTC P3306 on a BMW and making the necessary repairs, the fault code can be erased using a diagnostic scanner. By clearing the code, the check engine light should turn off, indicating that the issue has been resolved. It is important to verify that the repairs have been successful by performing a test drive and monitoring the vehicle’s performance.
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.