ASM Adaptive Learning Not Done
The engine's computer hasn't finished learning how to optimize air and fuel mixture timing after a recent reset or repair. Think of it like a new employee who needs training before working independently.
The ECU monitors adaptive fuel trim and ignition timing corrections to optimize combustion. After battery disconnect, software updates, or component replacement, the system must relearn baseline parameters through normal driving cycles. The adaptive learning status flag tracks completion of this recalibration process.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Adaptive Learning Status | Complete/Ready state achieved | Learning not completed after key cycles |
| Fuel Trim Variance | -10% to +10% | Trim values unstable or unlearned |
Code P0949 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0949 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.