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 transmitting the driver's gear selection to the transmission control module. A high voltage signal can be caused by a short to power, a faulty module, or wiring issues, potentially leading to erratic shifting or transmission malfunction.
01. Most Common Causes
- Short to power in the gear shift module communication circuit
- Faulty gear shift module
- Corroded or damaged wiring/connectors
- Faulty PCM or TCM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in one gear or fails to shift
- Erratic or harsh shifting
- Transmission warning light on
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
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 identify a short to power.
Step 4: If wiring is okay, test the gear shift module per manufacturer specifications and replace if faulty.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause unpredictable transmission behavior, potentially leading to a safety hazard or further transmission damage.
How much does it cost to fix?▼
The cost to fix P0862 typically ranges from $50 to $150 for diagnosis and minor repairs like connector cleaning, but can be higher if the gear shift module or PCM needs replacement.