P0734

P0734 means: Gear 4 Incorrect Ratio. Fourth gear ratio is incorrect — common on highway driving.

Gear 4 Incorrect Ratio

Fourth gear ratio is incorrect — common on highway driving.

SeverityCritical

CategoryTransmission

Est. Repair Cost$1000–$4000

Code TypePowertrain

DIY RepairProfessional

💡 Pro Tip: Overdrive gear issues cause poor fuel economy at highway speeds — often the first noticed symptom.

Full Repair Estimate

$1000–$4000

DIY Possible?

PRO

Severity

Critical

What does OBD2 code P0734 mean?+

P0734 stands for Gear 4 Incorrect Ratio. Fourth gear ratio is incorrect — common on highway driving.

What causes code P0734?+

Fourth gear clutch wear; Overdrive solenoid fault; Low fluid; Torque converter issue

How do I fix code P0734?+

Check transmission fluid; Test overdrive solenoid; Inspect transmission internally

How much does it cost to fix P0734?+

Estimated repair cost for P0734 is $1000–$4000.

Is P0734 DIY-friendly?+

P0734 typically requires professional equipment and a qualified mechanic.