BMW DTC P1446 – Diagnostic Module Tank Leakage (DM-TL) Pump Control Circuit High
DTC P1446 meaning on BMW
The Diagnostic Trouble Code (DTC) P1446 for BMW refers to the Diagnostic Module Tank Leakage (DM-TL) Pump Control Circuit High. This code indicates that there is a high voltage condition detected in the control circuit of the DM-TL pump, which is responsible for monitoring and managing the fuel vapor system’s integrity.
BMW DTC P1446 symptoms
Symptoms associated with BMW DTC P1446 may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Decreased fuel efficiency
- Strong fuel odor near the vehicle
BMW DTC P1446 causes
Common causes of BMW DTC P1446 include:
- Faulty DM-TL pump
- Wiring or connector issues in the DM-TL pump circuit
- Evaporative emissions system leaks
BMW DTC P1446 seriousness
While BMW DTC P1446 may not cause immediate drivability issues, it is essential to address this code promptly. Ignoring this fault can lead to increased emissions, potential fuel leaks, and may cause the vehicle to fail emissions tests.
How to diagnose DTC P1446 on BMW
To diagnose BMW DTC P1446, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the DM-TL pump and its wiring for any visible damage or corrosion
- Perform a smoke test to check for leaks in the evaporative emissions system
How to fix DTC P1446 on BMW
To fix BMW DTC P1446, the following steps may be taken:
- Replace the faulty DM-TL pump if necessary
- Repair any damaged wiring or connectors in the DM-TL pump circuit
- Address any leaks in the evaporative emissions system
How to erase DTC P1446 on BMW
After fixing the underlying issue causing BMW DTC P1446, the fault code can be erased using a diagnostic scanner. This will reset the Check Engine Light and clear the code from the vehicle’s memory.
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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