Drivable short-term, but fix now to avoid damage.
This code means the actual gear ratio in fifth gear doesn't match what the transmission computer expects, typically a sign of slipping. Common causes are low or degraded fluid, worn clutches or bands, or a faulty solenoid. Diagnosing it early can sometimes limit the fix to a fluid service or solenoid instead of a costly rebuild.
$200 – $2500
Varies by vehicle and root cause.
Short trips are usually fine, but slipping in fifth gear builds heat and can worsen damage at highway speeds, so limit driving and get it diagnosed soon.
A fluid service or solenoid replacement may cost $200 to $600, while internal clutch or band repairs can reach $1,500 to $2,500 or more depending on the transmission.
Yes, it indicates slipping in fifth gear, your highway cruising gear, and ignoring it can lead to expensive transmission damage over time.
When fifth gear slips, the transmission can't hold the engine at the right speed for cruising, so RPMs climb higher than normal until the problem is repaired.