3 JMC 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 |
|---|---|---|---|
| P0191 | Fuel System | Rough Idle / Hard Surge on Light Throttle | Unlock |
| P0299 | Air Intake | Loss of High-End Boost / Sluggish | Unlock |
| P0401 | Emissions / EGR | Check Engine Light / Hesitation on Decel | Unlock |
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