Severity: Fix right away. Driving risks expensive damage or a breakdown.
The transmission is slipping or not engaging 1st gear correctly — the input and output speeds do not match the expected 1st gear ratio.
Check the fluid level and condition. Internal repair is usually needed.
The car may struggle to move from a stop. Get it to a transmission shop.
Avoid driving until it is checked — towing is the safer choice. The car may struggle to move from a stop. Get it to a transmission shop.
The most common causes are: Worn 1st gear clutch pack; Low transmission fluid; Failing shift solenoid; Internal wear. A scan tool and a visual check of the parts above is where a technician starts.
Check the fluid level and condition. Internal repair is usually needed.