Gate Select Position Circuit

What it means

P0904 is defined as "Gate Select Position Circuit". the engine control module stores it when the monitored condition for this component or system is outside the limits programmed by the manufacturer.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

Symptoms

• Check engine or transmission warning light
• Harsh, delayed or missing shifts
• Transmission stuck in one gear (limp mode)
• Shuddering or slipping under load

Common causes

1. Gate Select Position Circuit worn, contaminated or out of calibration
2. Mechanical problem in the system the sensor measures
3. Air, vacuum or exhaust leak influencing the reading
4. Wrong or low-quality replacement part
5. Wiring resistance causing a small voltage offset

How to diagnose

1. Compare the live Gate Select Position Circuit reading with a known-good value or a second sensor at idle and at 2500 rpm
2. Check for air, vacuum or exhaust leaks that could skew the reading
3. Inspect the component for contamination and clean it if the design allows
4. Verify the part number is correct for the engine
5. Replace the Gate Select Position Circuit if the reading remains out of specification

Related codes

Nearby codes in this group

• P0903Clutch Actuator Circuit High
• P0905Gate Select Position Circuit Range/Performance
• P0902Clutch Actuator Circuit Low
• P0906Gate Select Position Circuit Low
• P0901Clutch Actuator Circuit Range/Performance
• P0907Gate Select Position Circuit High
• P0900Clutch Actuator Circuit/Open
• P0908Gate Select Position Circuit Intermittent