P1830
Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Inability to switch to all-wheel drive mode
- Check Engine Light Is On
- Unstable operation of the transfer case
- Loss of power in certain modes
Causes
- Short circuit in relay coil
- Wiring harness damage
- Transfer case relay malfunction
- Problems with the transmission control unit
- Contact corrosion
How to Fix
- Check the condition of the transfer case relay
- Diagnose the relay control circuit for a short circuit
- Check wiring harness for damage
- Replace the faulty relay if necessary
- Check contacts and connections for corrosion