P0860 Fault Code

Gear Shift Module Communication Circuit

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0860 fault code indicates an issue with the communication circuit of the gear shift module in a vehicle. This module is essential for coordinating the operation of the transmission based on the driver's input and vehicle conditions. A fault in this circuit can lead to improper or unavailable shifting of gears, affecting overall vehicle performance. Common components involved include the gear shift module itself, various sensors, and the related wiring harnesses, which may all be interconnected to facilitate proper communication.

What are the symptoms of the P0860 code?

The driver may experience various symptoms when the P0860 fault code is triggered, such as:

• Irregular shifting or failure to shift gears properly.
• The vehicle may enter limp mode, restricting performance and acceleration.
• Warning lights illuminated on the dashboard, often the Check Engine light.
• Delayed or harsh engagement when shifting gears.
• Difficulty in selecting drive modes (e.g., park, reverse, neutral, drive).

What causes the P0860 code?

Several factors can contribute to the P0860 fault code, including:

• Damaged or corroded wiring in the communication circuit.
• Faulty connectors that may cause intermittent signals.
• A malfunctioning gear shift module that fails to send or receive signals correctly.
• Issues with other transmission control components that affect communication.
• Software glitches or updates needed for the transmission control module.

How to fix P0860?

To resolve the P0860 fault code, consider the following repair steps:

• Begin with a thorough inspection of all wiring and connectors related to the gear shift module. Look for signs of damage, corrosion, or loose connections.
• Test the gear shift module and ensure it is functioning correctly. If it is faulty, replacement may be necessary.
• Check for any software updates for the transmission control module that may address communication problems.
• Verify the integrity of other related components, such as sensors and relays, to ensure they're working as intended.
• Clear the fault code from the vehicle’s computer and road test to confirm that the issue has been resolved.