Severity: Fix right away. Driving risks expensive damage or a breakdown.
The hydraulic unit that builds pressure for the transmission is not working correctly, so the transmission cannot engage gears properly.
Check the fluid level first, then have the hydraulic unit tested by a shop.
The transmission may not engage or may slip badly. Get it to a transmission shop.
Avoid driving until it is checked — towing is the safer choice. The transmission may not engage or may slip badly. Get it to a transmission shop.
The most common causes are: Failing hydraulic pump; Low transmission fluid; Internal leak; Failed pressure sensor. A scan tool and a visual check of the parts above is where a technician starts.
Check the fluid level first, then have the hydraulic unit tested by a shop.
