Transfer Case Contact Plate Circuit Fault
The P1867 code indicates an electrical fault in the power supply circuit of the transfer case contact plate. This plate or switch is used in 4WD/AWD systems to detect the position of the transfer case shaft and send a signal to the transmission control module or the transfer case control module (TCCM). When this code sets, the control module has detected an electrical anomaly in the power supply circuit, such as voltage out of range, a short circuit, or an open in the voltage reference line powering the sensor.
01. Most Common Causes
- Open circuit or damaged wiring in the contact plate power supply circuit
- Short to ground or voltage in the sensor wiring
- Faulty or damaged transfer case contact plate
- Corroded, bent, or loose electrical connections at the sensor connector
- Faulty transfer case control module (TCCM) or powertrain control module (PCM)
02. Symptoms You Will Notice
- Check Engine Light or 4WD warning light illuminated
- 4WD system inoperative or stuck in one mode
- Reduced traction or unexpected engagement/disengagement of 4WD
03. Step-by-Step Diagnosis
Scan for additional codes and freeze frame data
Visually inspect the transfer case contact plate wiring and connector for damage, corrosion, or loose pins
Test the voltage reference and ground circuits at the contact plate connector using a multimeter
Check for continuity and shorts in the wiring between the contact plate and the TCCM/PCM
If wiring is okay, test the contact plate resistance and operation per manufacturer specs; replace if faulty
If all else passes, suspect a faulty TCCM or PCM and perform further module diagnostics
1. Frequently Asked Questions
Is it safe to drive?▼
Driving with code P1867 is not recommended because the 4WD system may malfunction, leading to unpredictable handling or loss of traction, especially in adverse conditions. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on the root cause. A simple wiring repair may cost $150–$300, while replacing the contact plate or control module can run $400–$600 or more.