Gate Select Position Circuit Intermittent

What it means

P0908 is stored when the Gate Select Position signal drops out or jumps erratically for short periods. Intermittent faults are almost always connector, wiring or vibration related.

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. Damaged, chafed or corroded wiring in the Gate Select Position circuit
2. Corroded, loose or water-damaged connector terminals
3. Failed Gate Select Position component (sensor, solenoid or actuator)
4. Poor ground connection for the module or component
5. Faulty control module driver (rare, confirm all else first)

How to diagnose

1. Read freeze frame data and note when the code set (cold start, under load, after rain)
2. Inspect the Gate Select Position connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
3. Measure supply voltage and ground at the connector with the key on
4. Check the signal wire for shorts to ground or battery and for continuity to the control module
5. Test or substitute the Gate Select Position only after wiring and connectors are confirmed good
6. Clear the code and complete a drive cycle to confirm the repair

Related codes

Nearby codes in this group

• P0907Gate Select Position Circuit High
• P0909Gate Select Control Error
• P0906Gate Select Position Circuit Low
• P0910Gate Select Actuator Circuit/Open
• P0905Gate Select Position Circuit Range/Performance
• P0911Gate Select Actuator Circuit Range/Performance
• P0904Gate Select Position Circuit
• P0912Gate Select Actuator Circuit Low