P0117

DTC P0117
Engine coolant temperature sensor input fault Drive cycle D:Signal out of range - below minimum.

Possible causes by suggested order of priority:
- Connectors C196, ECM C636 (B).
- Open circuit - C636/22 (G) to C196/2 (G).
- Open circuit - C636/21 (RB) to C196/1 (KB).
- Engine cooling system problem.
- Engine coolant temperature sensor fault.

Connectors C196, ECM C636 (B).
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

Open circuit - C636/22 (G) to C196/2 (G).
- Check resistance > 1M Ohm

Open circuit - C636/21 (RB) to C196/1 (KB).
- Check resistance > 1M Ohm

Engine cooling system problem.
- Check if the engine does not fully warm up within the normal time.
- Check that there is not a problem with the cooling system thermostat sticking open.
NOTE: the diagnostic will flag a fault if the coolant temperature does not rise at the expected rate.
- Engine cooling system fault.
- Coolant thermostat fault.

Engine coolant temperature sensor fault.
- Check coolant temperature sensor by substitution with a known good unit.
- Engine coolant temperature sensor fault.