C0402

Transfer Case Solenoid Valve

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

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

C0401 C0403 C0404