Severity: Fix right away. Driving risks expensive damage or a breakdown.
The computer is getting no usable signal from the sensor that tells it which gear the shifter is in (Park, Reverse, Neutral, Drive), so it may not know what gear you selected.
Check the sensor adjustment and wiring, then replace the sensor if it gives no signal.
The car may not start, may start in gear, or may shift oddly. Get it checked right away.
Avoid driving until it is checked — towing is the safer choice. The car may not start, may start in gear, or may shift oddly. Get it checked right away.
The most common causes are: Failed range sensor; Damaged wiring or connector; Misadjusted sensor; Water in the connector. A scan tool and a visual check of the parts above is where a technician starts.
Check the sensor adjustment and wiring, then replace the sensor if it gives no signal.
