P0734 on Hyundai
Gear 4 Incorrect Ratio
P0734 on Hyundai vehicles indicates gear 4 incorrect ratio. Au7o has documented this code across 1 Hyundai model — most commonly on Veracruz. This code means the Transmission/Powertrain Control Module detected an incorrect gear ratio in 4th gear. The module continuously compares input shaft speed to output shaft speed; if the ratio in 4th gear doesn't match the expected value, it sets P0734. This usually indicates the transmission is slipping or not fully engaging 4th gear due to a hydraulic, friction, or solenoid problem. Symptoms include slipping, flaring RPM, harsh or missed shifts, and possibly limp mode. Typical repair costs on Hyundai range from $200 to $3,500, depending on the specific model and root cause.
Common Causes of P0734
- •Low or degraded/burnt transmission fluid
- •Slipping clutch packs or worn friction elements in 4th gear
- •Stuck or faulty shift solenoid
- •Valve body / internal hydraulic leak or restriction
- •Worn or failing torque converter
- •Faulty input or output speed sensor
- •Internal mechanical wear (bands, planetary gears)
P0734 on Hyundai by Model
Hyundai Veracruz(1 issue)
- 6-Speed Automatic Transmission Harsh Shifting and Shudder2007-2012
The Veracruz uses an Aisin-Warner A6LF1 6-speed automatic transmission that develops harsh shifting and torque converter shudder. The most common complaint is a shudder during light-throttle acceleration at 35-50 mph caused by torque converter clutch material breakdown. The valve body solenoids also develop wear, causing delayed 2-3 and 4-5 upshifts. Hyundai extended the transmission warranty to 10 years/100,000 miles on some affected vehicles through TSB 09-AT-001.
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What does P0734 mean on Hyundai?▼
P0734 stands for "Gear 4 Incorrect Ratio." This code means the Transmission/Powertrain Control Module detected an incorrect gear ratio in 4th gear. The module continuously compares input shaft speed to output shaft speed; if the ratio in 4th gear doesn't match the expected value, it sets P0734. This usually indicates the transmission is slipping or not fully engaging 4th gear due to a hydraulic, friction, or solenoid problem. Symptoms include slipping, flaring RPM, harsh or missed shifts, and possibly limp mode. On Hyundai specifically, this code is documented across 1 model.
What causes P0734 on Hyundai vehicles?▼
Common causes on Hyundai: Low or degraded/burnt transmission fluid, Slipping clutch packs or worn friction elements in 4th gear, Stuck or faulty shift solenoid, Valve body / internal hydraulic leak or restriction, Worn or failing torque converter. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0734 on a Hyundai?▼
Repair costs on Hyundai range from $200 to $3,500, depending on the specific model and root cause.
Which Hyundai models have P0734 documented?▼
Au7o has documented P0734 on 1 Hyundai model: Veracruz.