Gear Shift Module Communication Circuit High
The P0862 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the communication circuit of the gear shift module. This module is responsible for sending the selected gear position to the transmission control module (TCM). A high voltage reading suggests a short to power, faulty module, or wiring issue, which can disrupt gear selection and transmission operation.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in one gear or fails to shift
- Gear shift indicator not displaying correctly
- Vehicle may not start or shift out of Park
2. Most Common Causes
- Short to power in the gear shift module communication circuit
- Faulty gear shift module
- Damaged wiring or connectors in the communication circuit
- Corrosion or poor electrical connections
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the gear shift module wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the communication circuit voltage with a multimeter to confirm high voltage condition.
Step 4: Check for technical service bulletins (TSBs) related to the gear shift module for your vehicle.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may experience unexpected gear shifts or become stuck in gear, increasing the risk of an accident.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnostic and minor repairs like cleaning connectors, but can be higher if the gear shift module needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.