Gear Shift Position Circuit A Intermittent
What it means
P0918 means the gear-shift position sensor signal — which tells the controller which gear or shift position is currently selected — is dropping in and out intermittently. When the controller loses track of position it can shift roughly, miss a shift, or briefly refuse to change gear on automated transmissions. The engine still starts and runs; the intermittent behavior most often points to a loose connector, chafed wiring, or a sensor beginning to fail rather than a mechanical problem.
Can I keep driving? Driveable, but shifts may be rough or intermittently missed; on automated gearboxes it can briefly refuse to shift. Fix it promptly.
Common symptoms
What you'll notice
- Check-engine light (may be intermittent)
- Rough or slipping shifts
- Intermittent failure to shift
- Possible limp (fail-safe) mode
Common causes
Most likely first
- Intermittent wiring or connector fault in the gear-shift position circuitLikely
- Failing gear shift position sensorCommon
- Loose or corroded connectorsCommon
- Faulty control module (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and wiggle-test the connector and harness on live data.
- Inspect, secure, and clean the wiring and connectors.
- Replace the gear shift position sensor if its signal drops out.
- Test the control module if the wiring checks out.
- Clear the code and road-test.
FAQ
Quick answers
Is it safe to drive with P0918?+
Can I just clear P0918?+
Related codes
Often seen with P0918
Read & clear P0918 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.