P1856
Transmission Transfer Case Contact Plate 'C' Short Circuit To Battery
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Check Engine light comes on
- Gear shifting problems
- Unstable all-wheel drive operation
- The transmission goes into emergency mode
- Reduced vehicle dynamics
Causes
- Damage to transfer case wiring harness
- Short circuit in contact plate circuit
- Contact plate 'C' faulty
- Transmission control module (TCM) problems
- Corrosion of electrical contacts
How to Fix
- Check the condition of the transfer case wiring harness
- Diagnose contact plate circuit 'C'
- Check contact plate resistance
- Replace damaged components if necessary
- Test the operation of the system after repair