C0402
Transfer Case Solenoid Valve
C0402 is an OBD-II diagnostic trouble code meaning: Transfer Case Solenoid Valve. Common causes: transfer case solenoid malfunction, open or short circuit in control circuit. Estimated repair cost: $56–167.
Symptoms
- Four-wheel drive indicator flashing
- Problems with switching transfer case modes
- Deterioration in off-road handling
- Clicking or other unusual sounds from the transfer case
Causes
- Transfer case solenoid malfunction
- Open or short circuit in control circuit
- Poor contact in connectors
- Mechanical valve jamming
- Problems with the transfer box control unit
How to Fix
- Check the integrity of the wiring harness to the solenoid
- Check solenoid resistance (usually 10-30 ohms)
- Clean the connector contacts
- Check the mechanical operation of the valve
- Replace faulty solenoid if necessary
- Reset the error and check the system operation
Related codes
Error C0402 by Vehicle Brand
FAQ
What does the C0402 code mean?
C0402 is an OBD-II diagnostic trouble code that indicates: Transfer Case Solenoid Valve
What causes a C0402 error code?
The most common causes of C0402 include: Transfer case solenoid malfunction; Open or short circuit in control circuit; Poor contact in connectors; Mechanical valve jamming.
How do I fix a C0402 diagnostic trouble code?
To fix C0402: Check the integrity of the wiring harness to the solenoid. Check solenoid resistance (usually 10-30 ohms). Clean the connector contacts. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0402?
Limited driving only, diagnose soon
How much does it cost to fix C0402?
The estimated repair cost for C0402 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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