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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 952 (5.7L CNG - DTCS P0606 To P2123 - 2500 Hd) >> Diagnosis And Testing >> P1657-Alternative Fuel Rail/System Temperature - Too High >> When Monitored

When Monitored

WARNING: This page is about a different car, the 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

The follow conditions must be to enable the monitor: 1. Engine running; 2. CNG fuel mode commanded on; 3. CNG Shut off Relay energized; 4. Engine coolant temperature above 80°C (176°F) for 45.0 seconds; 5. No Fuel Rail Temperature Sensor circuit faults active.