P1129 JEEP Possible Causes
- Fuel delivery system
- Engine Coolant Temperature (ECT) sensor or wiring connectors
- MAP sensor or wiring connectors
- O2 sensor wiring or connectors
- Engine mechanical system
Symptoms
possible
- Check engine light on (or service engine soon warning light)
P1129 JEEP Meaning
The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated duration, when conditions would otherwise have closed loop operation.