P0729

Gear 6 Incorrect Ratio

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–278 (est.)

Symptoms

Unstable operation in 6th gear
Automatic gear shifting
Check Engine light comes on
Decreased fuel efficiency
Acceleration problems

Causes

Low or contaminated transmission fluid
Worn friction discs or gears
Shift solenoids malfunction
Problems with shaft speed sensors
Mechanical damage in the gearbox

How to Fix

Check the level and condition of the transmission fluid
Diagnose the operation of switching solenoids
Check input and output shaft speed sensors
Perform diagnostics of the mechanical part of the gearbox
If necessary, replace worn components

Related codes

P0730 P0728 P0736