BMW DTC P31DC – H2 and High Pressure Injector ECM Boost Voltage Too Low (Bank 1)
DTC P31DC meaning on BMW
DTC P31DC on a BMW refers to the code for ¨High Pressure Injector ECM Boost Voltage Too Low (Bank 1).¨ This diagnostic trouble code indicates that the engine control module (ECM) has detected a low voltage condition in the high-pressure fuel injector system of Bank 1.
BMW DTC P31DC symptoms
Symptoms of DTC P31DC on a BMW may include rough idling, engine misfires, reduced engine performance, hesitation during acceleration, and potentially an illuminated check engine light on the dashboard.
BMW DTC P31DC causes
The causes of DTC P31DC on a BMW can vary, but common reasons include a faulty high-pressure fuel injector, wiring issues, a malfunctioning ECM, or a problem with the fuel delivery system.
BMW DTC P31DC seriousness
DTC P31DC should be addressed promptly as it can lead to poor engine performance, reduced fuel efficiency, and potential long-term damage to the engine if left unresolved.
How to diagnose DTC P31DC on BMW
To diagnose DTC P31DC on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then perform a visual inspection of the high-pressure fuel injector system, check the wiring for any damage, and conduct tests to determine the root cause of the voltage issue.
How to fix DTC P31DC on BMW
Fixing DTC P31DC on a BMW may involve replacing the faulty high-pressure fuel injector, repairing any damaged wiring, or addressing issues with the ECM or fuel delivery system. It is recommended to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P31DC on BMW
Once the underlying issue causing DTC P31DC on a BMW has been resolved, the diagnostic trouble code can be cleared using a diagnostic scanner. This will reset the ECM and turn off the check engine light. It is important to ensure that the repair has been successful before clearing the code.
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.