BMW DTC P31AE – Cylinder 12 H2-Injector Low Side Circuit/Open
DTC P31AE meaning on BMW
The DTC P31AE code on a BMW indicates a fault with the Cylinder 12 H2-Injector Low Side Circuit/Open. This means that there is an issue with the fuel injector for cylinder 12, specifically related to the low side circuit being open or not functioning properly.
BMW DTC P31AE symptoms
Symptoms of the BMW DTC P31AE code may include rough idling, misfiring, decreased engine performance, poor fuel efficiency, and potentially an illuminated check engine light on the dashboard.
BMW DTC P31AE causes
The causes of the DTC P31AE code on a BMW can vary, but common reasons include a faulty fuel injector, wiring issues in the low side circuit, poor electrical connections, or a problem with the Engine Control Module (ECM).
BMW DTC P31AE seriousness
Ignoring the DTC P31AE code on a BMW can lead to further engine performance issues, potential damage to the catalytic converter, and increased fuel consumption. It is important to address this code promptly to prevent any long-term damage.
How to diagnose DTC P31AE on BMW
To diagnose the DTC P31AE on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes and perform a visual inspection of the fuel injector, wiring, and connections. They may also conduct tests to check the injector’s resistance and functionality.
How to fix DTC P31AE on BMW
Fixing the DTC P31AE code on a BMW may involve replacing the faulty fuel injector, repairing any damaged wiring or connections, or addressing issues with the Engine Control Module. It is recommended to follow the manufacturer’s diagnostic and repair procedures for a proper fix.
How to erase DTC P31AE on BMW
Once the underlying issue causing the DTC P31AE code on a BMW has been resolved, the code can be cleared using a diagnostic scanner. By clearing the code, the check engine light should turn off, indicating that the problem has been addressed.
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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