OBD Guide
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P1891

Transmission Transfer Case Contact Plate Ground Return Open Circuit

P1891 is an OBD-II diagnostic trouble code meaning: Transmission Transfer Case Contact Plate Ground Return Open Circuit. Common causes: broken ground wire, poor contact at terminals. Estimated repair cost: $6–33.

Severity
⚠️ Medium
Can 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

  1. Check the integrity of the grounding circuit
  2. Clean contacts from corrosion
  3. Check the condition of the contact plate
  4. Replace damaged wires
  5. Check connector connections

Related codes

P1890P1892

Error P1891 by Vehicle Brand

BuickCadillacChevroletFordGMGMCLincolnMercuryOldsmobileSaturn

FAQ

What does the P1891 code mean?

P1891 is an OBD-II diagnostic trouble code that indicates: Transmission Transfer Case Contact Plate Ground Return Open Circuit

What causes a P1891 error code?

The most common causes of P1891 include: Broken ground wire; Poor contact at terminals; Contact plate fault; Corrosion at the joint.

How do I fix a P1891 diagnostic trouble code?

To fix P1891: Check the integrity of the grounding circuit. Clean contacts from corrosion. Check the condition of the contact plate. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1891?

Yes, but get it checked soon

How much does it cost to fix P1891?

The estimated repair cost for P1891 is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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