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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 ((Cabin Compartment Node (CCN) - Electrical Diagnostics)) >> Diagnosis and Testing >> P0838-Four Wheel Drive (4WD) Switch Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read Cluster DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  2.

      No 

      • The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
  2. TRANSFER CASE SELECTOR SWITCH 
    1. Turn the ignition off.
    2. Disconnect the Transfer Case Selector Switch harness connector.
    3. Turn the ignition on.
    4. With the scan tool, read Cluster DTCs.

      Does the scan tool display DTC: P0838-FOUR WHEEL DRIVE (4WD) SWITCH CIRCUIT LOW as active?

      Yes 

      • Go To  3.

      No 

      • Replace the Transfer Case Selector Switch in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
  3. (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORTED TO GROUND 
    Fig 1: Checking Transfer Case Position Sensor Input Circuit Shorted To Ground
    GC0091201Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Cluster C3 harness connector.
    3. Measure the resistance between ground and the (K77) Transfer Case Position Sensor Input circuit.

      Is the resistance less than 5.0 Ohms?

      Yes 

      • Repair the (K77) Transfer Case Position Sensor Input circuit for a short to ground.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.

      No 

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