Powertrain Codes
P0904
Gate Select Position Circuit
★★★ Common diagnostic code
P0904 means the vehicle detected a fault related to gate select position circuit. On most vehicles this points to the transmission, driveline, clutch, or control circuit that needs testing before parts are replaced.
What P0904 Means
P0904 means the vehicle detected a fault related to gate select position circuit. On most vehicles this points to the transmission, driveline, clutch, or control circuit that needs testing before parts are replaced.
Before You Replace Anything
Record the evidence first. Clearing codes too early can erase the clues that point to the real fault.
Common Symptoms
Most Common Causes
Diagnostic Confidence
Use this as a starting point, not a replacement for testing.
Recommended Diagnostic Workflow
Mechanic's Tips
Save freeze-frame data and check for related transmission, communication, voltage, and module codes. Always verify fluid level/condition and electrical integrity before condemning a sensor, solenoid, actuator, or module.
Common Mistakes to Avoid
Common Repairs
Repair wiring or connector damage
Success Rate: ★★★☆☆
Average Cost: $100-$900
Labor: 0.5-2.5 hours
Replace confirmed failed component
Success Rate: ★★★☆☆
Average Cost: $100-$900
Labor: 0.5-2.5 hours
Perform relearn or calibration if required
Success Rate: ★★★☆☆
Average Cost: $100-$900
Labor: 0.5-2.5 hours
Clear codes and complete a drive cycle
Success Rate: ★★★☆☆
Average Cost: $100-$900
Labor: 0.5-2.5 hours
Parts Commonly Replaced
Tools Used During Diagnosis
Related Repairs
How to Explain This to Your Customer
Your vehicle stored P0904, which points to a problem with gate select position circuit. The next step is diagnosis of the related circuit or component so the repair is based on test results instead of guessing.
Manufacturer Notes
Generic OBD-II information. Exact test steps, component names, connector locations, relearn procedures, and repair strategy may vary by make, model, year, transmission, and calibration.
Technician Notes
Save freeze-frame data and check for related transmission, communication, voltage, and module codes. Always verify fluid level/condition and electrical integrity before condemning a sensor, solenoid, actuator, or module.
Related Codes
FAQ
What does P0904 mean?
P0904 means the computer detected a fault related to gate select position circuit.
Is P0904 serious?
It can be. Transmission, clutch, or driveline faults can lead to limp mode, harsh shifting, no-start conditions, or additional damage if ignored.
Can I drive with P0904?
Avoid extended driving if the vehicle shifts poorly, slips, overheats, or enters limp mode. Diagnose it before continuing normal use.
Will P0904 fail emissions?
It may fail emissions if the Check Engine Light is on or readiness monitors are incomplete.
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