What does P0838 Mean? The Transmission Control Module (TCM) monitors the Four Wheel Drive Switch Circuit signal. the TCM sets the OBDII code when the Four Wheel Drive Switch Circuit is not to factory specifications. engine code P0838P0838 fixobd P0838dtc P0838obd code P0838obd2 P0838P0838 car codediagnostic code P0838car code P0838check engine code P0838fehlercode P0838P0838 fiatcodigo P0838codigo falla P0838P0838 kody b??dówcodigo de falla P0838 What are the common causes of P0838 ? Common causes include four-wheel drive switch or actuator failures. Other causes include faulty sensors, solenoids, or switches, and defective wiring harnesses and connectors. How do you troubleshoot P0838 ? With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. Searches related to P0838 - Four Wheel Drive Switch Circuit Low p0837 four wheel drive 4wd switch circuit range performance p0837 jeep liberty p0838 jeep
