4 QSM11 diagnostic codes on file. Each shows the symptom for free — unlock the full diagnosis, repair steps, and field insights with a free account.
| Code | System | Symptom | Fix |
|---|---|---|---|
| Code 115 / 121 | Crank/Cam Sensors | Engine won't start. | Unlock |
| Code 144 / 145 | Coolant Sensor | Engine Derate. | Unlock |
| Code 221 / 222 | Baro/Boost | Black Smoke/Low Power. | Unlock |
| Code 434 | ECM Power | Random Shutdown. | Unlock |
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