Fuel Timing Error
Your engine's fuel injectors are firing at the wrong time, like a musician playing notes out of sync with the beat. This timing error prevents proper combustion and engine performance.
The ECU monitors fuel injection timing against crankshaft position using the CMP and CKP sensors. It compares actual injection pulses to expected timing windows and flags a fault when deviations exceed acceptable thresholds. Timing errors of more than 5-10 degrees of crankshaft rotation typically trigger this code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Fuel Injection Timing Offset | ±2-5° crankshaft rotation from target | >±10° deviation or multiple misses |
| CMP/CKP Correlation | Synchronized within 1 tooth | Loss of sync or multiple tooth misalignment |
Code P0149 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, P0149 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.