P0904 Fault Code

Gate Select Position Circuit [senses left / right position]

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

The P0904 fault code indicates an issue with the Gate Select Position Circuit, which is responsible for sensing the left and right positions of the gear selector in a vehicle's transmission system. This circuit plays a crucial role in ensuring that the transmission operates smoothly by accurately detecting gear selection. When this fault code is triggered, it may lead to improper gear engagement or shifting problems.

What are the symptoms of the P0904 code?

When the P0904 code appears, you may notice various symptoms, such as:

• Difficulty in shifting gears or feeling stuck in one gear.
• Erratic or delayed shifting behavior, leading to a disjointed driving experience.
• Illuminated check engine light or transmission warning light on the dashboard.
• In some cases, the vehicle may enter 'limp mode' to prevent further damage.

What causes the P0904 code?

Several factors can lead to the P0904 fault code being triggered, including:

• Faulty or damaged wiring in the gate select position circuit.
• A malfunctioning gate select position sensor that fails to send accurate position signals.
• Poor electrical connections or corrosion at the connector terminals.
• Issues within the transmission control module (TCM) that affect how it interprets sensor signals.

How to fix P0904?

To resolve the P0904 fault code, follow these steps:

1. Inspect the wiring and connectors related to the gate select position circuit for any signs of damage or corrosion.
2. Test the gate select position sensor to ensure it is functioning correctly and providing accurate readings.
3. Clean any corroded connectors and secure loose connections.
4. Replace any faulty components, such as the sensor or wiring, as needed.
5. Clear the fault codes and test drive the vehicle to ensure the issue is resolved.