P1891
Transmission Transfer Case Contact Plate Ground Return Open Circuit
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$6–33 (est.)
Symptoms
- Incorrect operation of the transfer case
- Check Engine light comes on
- Loss of traction on one of the axles
- Gear shifting problems
- The car may go into emergency mode
Causes
- Broken ground wire
- Poor contact at terminals
- Contact plate fault
- Corrosion at the joint
- Wiring harness damage
How to Fix
- Check the integrity of the grounding circuit
- Clean contacts from corrosion
- Check the condition of the contact plate
- Replace damaged wires
- Check connector connections