DTC P1889-1F: Oil Pressure Pump Performance - Circuit intermittent: Action
- Refer to the relevant service information and check the transfer case fluid level. Rectify any leaks as necessary. Drain and refill the transfer case with the specified grade and volume of fluid
- Refer to the appropriate system wiring diagrams and check the transfer case fluid pump circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new transfer case fluid pump as necessary