Is your Check Engine Light on? If you have scanned your vehicle and retrieved the P1449 diagnostic trouble code, you are likely dealing with a specific issue in your vehicle’s Evaporative Emission Control (EVAP) system.
While this code appears in various manufacturers, it is most notorious in BMW vehicles (Diagnostic Module Tank Leakage - DMTL Pump) and Honda hybrids.
What Does Code P1449 Mean?
Unlike generic P0xxx codes, P1449 changes meaning depending on the badge on your hood. Here are the two most common definitions searched by mechanics:
| Vehicle Make | Meaning of P1449 | Common Cause |
|---|---|---|
| BMW / Mini | DMTL Pump Current Too High | The pump used to test for fuel leaks is clogged or electrically shorted. |
| Honda / Acura | Battery Module Deviation | Often seen in Hybrids; indicates an issue with High Voltage battery cooling or cell balance. |
Symptoms of a P1449 Error
If this code is stored in your ECU, you will likely experience:
- Solid Check Engine Light: The most immediate indicator.
- Fuel Odors: A distinct smell of raw gasoline near the rear wheel well (common in EVAP failures).
- Failed Emissions Test: You cannot pass a state smog inspection with a P1449 pending.
- Hard Refueling: The gas pump nozzle may click off repeatedly while filling up (indicates a clogged EVAP canister).
How to Diagnose P1449 Like a Pro
Diagnosing EVAP leaks and pump failures requires more than just "reading codes." You need Bi-Directional Control—the ability to send commands to the car to test components.
Step 1: The Visual Inspection
Check your gas cap first. While P1449 is usually electrical, a loose cap can trigger related codes. Inspect the wiring harness leading to the charcoal canister (usually located under the rear of the car) for signs of rodent damage or corrosion.
Step 2: Actuation Test with iCarsoft CR Ultra P
To confirm a failed DMTL pump without guessing, you should use the iCarsoft CR Ultra P.
Using the Actuation Test / Bi-Directional Control feature:
- Connect the CR Ultra P to your OBDII port.
- Navigate to Diagnosis > Drive System > EVAP System.
- Select "Actuation Test" for the DMTL Pump.
- Command the pump ON.
The Result: If you command the pump ON but hear no sound, or if the scanner shows the current draw spiking (Current > 30mA), the pump is dead and needs replacement.
Frequently Asked Questions (FAQ)
Q: Can I drive with a P1449 code?
Yes, the car is usually drivable. However, if you smell fuel, it poses a fire risk and should be fixed immediately. Additionally, your remote start features may be disabled until the CEL is cleared.
Q: How much does it cost to fix?
A replacement DMTL pump for a BMW typically costs between $60 and $150 for the part. If you have an iCarsoft CR Ultra P, you can verify the failure yourself and save $200-$400 in labor costs by doing the swap in your driveway.
Q: Will disconnecting the battery fix P1449?
No. Disconnecting the battery only temporarily clears the light. The moment the car runs its self-diagnostic "monitor" again, the code will return. You must fix the part and use a scanner to clear the permanent code.
Need a professional tool to diagnose P1449, P0456, and other complex system errors? Check out the iCarsoft CR Ultra P, the ultimate solution for DIYers and professionals.
