Drive with caution — fix soon.
This code means the transmission computer sees that the actual gear ratio in second gear doesn't match the expected value, typically due to slipping clutches or gears not fully engaging. Common causes include low or degraded transmission fluid, a faulty shift solenoid, or internal wear. It's often resolved with a fluid service or solenoid repair, but heavy internal damage may require a rebuild.
$150 – $3500
Varies by vehicle and root cause.
Short, easy trips are usually okay, but don't ignore it. A slipping second gear can overheat and wear the transmission, so get it checked soon and avoid hard acceleration or hauling loads until it's repaired.
Simple fixes like a fluid service or one solenoid often cost $150 to $600. If the clutches or internal parts are worn, repairs or a rebuild can run $1,500 to $3,500 or more.
It's moderately serious. The car usually still drives, but the transmission is slipping in second gear and can suffer major damage if you keep driving it hard.
They're nearly identical problems but in different gears. P0731 is an incorrect ratio in first gear, while P0732 is the same fault in second gear, so the diagnosis and repairs are very similar.