BMW DTC P248D – Reductant Heater ‘B’ Sense Circuit High
DTC P248D meaning on BMW
DTC P248D is a diagnostic trouble code that indicates an issue with the Reductant Heater ‘B’ Sense Circuit High in a BMW vehicle. This fault code specifically points to a problem with the circuit that monitors the reductant heater ‘B’ sensor, which is a component of the vehicle’s emissions control system.
BMW DTC P248D symptoms
Symptoms of DTC P248D in a BMW may include the check engine light illuminating on the dashboard. Additionally, the vehicle may experience reduced fuel efficiency and performance due to the emissions control system not functioning optimally.
BMW DTC P248D causes
The most common causes of DTC P248D in a BMW include a faulty reductant heater ‘B’ sensor, damaged wiring or connectors in the sensor circuit, or a malfunction in the engine control module (ECM) that controls the sensor.
BMW DTC P248D seriousness
While DTC P248D may not cause immediate drivability issues, it is important to address this fault code promptly to ensure the vehicle’s emissions system is functioning correctly. Ignoring this code could lead to increased emissions and potential long-term damage to the vehicle’s engine and catalytic converter.
How to diagnose DTC P248D on BMW
To diagnose DTC P248D on a BMW, a mechanic will typically use a diagnostic scanner to retrieve the fault code and perform a thorough inspection of the reductant heater ‘B’ sensor circuit. This may involve testing the sensor, checking the wiring and connectors for damage, and verifying the ECM’s functionality.
How to fix DTC P248D on BMW
Fixing DTC P248D on a BMW may involve replacing the faulty reductant heater ‘B’ sensor, repairing any damaged wiring or connectors in the circuit, or reprogramming the ECM if necessary. It is recommended to follow the manufacturer’s diagnostic and repair procedures to address this fault code effectively.
How to erase DTC P248D on BMW
Once the underlying issue causing DTC P248D has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the check engine light and allow the vehicle’s ECM to monitor the emissions system for any new faults. It is important to ensure that the repair has been successful before clearing the fault 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.