P1858
Transmission Transfer Case Contact Plate 'D' Circuit Failure
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Check Engine light comes on
- Problems with switching all-wheel drive modes
- Unstable operation of the transfer case
- Reduced controllability on difficult road conditions
- Possible jerking when changing gears
Causes
- Open or short circuit in contact plate 'D' circuit
- Damage to transfer case contact plate
- Problems with the transfer case wiring harness
- Transfer case control unit malfunction
- Corrosion of contacts or connectors
How to Fix
- Check continuity of contact plate 'D'
- Inspect the contact plate for damage
- Check the condition of the wiring harness and connectors
- Test the transfer case control unit
- If necessary, replace the contact plate or repair the wiring