DTC P0126-26: Insufficient Coolant Temp For Stable Operation - Signal rate of change below threshold: Action
- Refer to the appropriate electrical circuit wiring diagrams and check engine coolant temperature sensor 1 circuit for short circuit to ground, short circuit to power, open circuit
- Check for related coolant temperature coolant sensor faults. Check and install a new thermostat as required. Refer to the warranty policy and procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component