P1311 – Injector Control Pressure Too Low
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Symptoms
- Hard starting
- Rough idle
- Stalling
- Weak acceleration
Causes
- Weak pump
- Oil pressure issue (diesel)
- Leaking injector
- Wiring fault
Diagnosis
- Measure control pressure
- Check pump
- Inspect injectors
- Scan ECU
Repair
- Replace pump
- Repair wiring
- Replace injector