BMW DTC P249D – Closed Loop Reductant Injection Control At Limit – Flow Too Low
DTC P249D meaning on BMW
DTC P249D on a BMW indicates an issue with the Closed Loop Reductant Injection Control system, specifically that the flow is too low. This system is responsible for injecting a precise amount of diesel exhaust fluid (DEF) into the exhaust stream to reduce harmful emissions.
BMW DTC P249D symptoms
Symptoms of DTC P249D on a BMW may include the illumination of the check engine light, reduced engine performance, and potential failure to pass emissions testing.
BMW DTC P249D causes
The causes of DTC P249D on a BMW can vary, but common reasons include a malfunctioning reductant injector, a clogged reductant injector nozzle, low DEF fluid level, or a faulty reductant control module.
BMW DTC P249D seriousness
While DTC P249D may not cause immediate drivability issues, it is important to address this fault promptly to ensure compliance with emissions regulations and prevent potential long-term damage to the vehicle’s emissions system.
How to diagnose DTC P249D on BMW
To diagnose DTC P249D on a BMW, a diagnostic scan tool capable of reading manufacturer-specific codes is required. The technician will need to inspect the reductant injection system components, check DEF fluid levels, and perform system tests to pinpoint the exact cause of the fault.
How to fix DTC P249D on BMW
Fixing DTC P249D on a BMW may involve replacing a faulty reductant injector, cleaning a clogged injector nozzle, refilling DEF fluid, or repairing the reductant control module. It is recommended to follow manufacturer guidelines and use OEM parts for a proper repair.
How to erase DTC P249D on BMW
After the underlying issue causing DTC P249D on a BMW has been resolved, the fault code can be cleared using a diagnostic scan tool. This will reset the check engine light and allow the vehicle’s onboard computer to monitor the system for any new faults.
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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