Drivable short-term, but fix now to avoid damage.
This code means the transmission's actual ratio in fourth gear doesn't match the expected value, a typical indicator of slipping. It's often caused by low or worn fluid, worn clutch packs or bands, or a failing solenoid. Addressing it early can sometimes keep the repair to a fluid service or solenoid rather than a major rebuild.
$200 – $2500
Varies by vehicle and root cause.
You can drive short distances, but slipping in fourth gear builds heat and can worsen the damage, especially at highway speeds, so get it checked soon.
A fluid service or solenoid replacement may cost $200 to $600, but internal clutch or band repairs can run $1,500 to $2,500 or more depending on the vehicle.
Yes. It points to slipping in fourth gear, which is your main highway gear, and ignoring it can lead to expensive transmission damage.
When fourth gear slips, the engine spins faster than it should for your speed, burning more fuel and reducing efficiency until the issue is fixed.