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P0734 - Gear 4 Incorrect ratio

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
What does this mean? What does this mean?
Tech notes
Start by inspecting the transmission fluid level and condition, and change fluid if necessary.
What does this mean? What does this mean?
When is the code detected?
P0734 is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting
P0734 Description

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor

B: Engine speed signal from Engine Control Module (ECM)

C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (4th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

P0734 Information for specific makes
P0734 ACURA Problem In 4th Clutch And 4th Clutch Hydraulic Circuit
P0734 AUDI Gear 4 Incorrect Ratio
P0734 BMW Gear 4 Incorrect ratio
P0734 CHRYSLER Gear Ratio Error In Fourth Gear
P0734 DODGE Gear Ratio Error In Fourth Gear
P0734 FORD Incorrect Fourth Gear Ratio
P0734 HONDA Problem In 4th Clutch And 4th Clutch Hydraulic Circuit
P0734 HYUNDAI Fourth Gear Incorrect Ratio
P0734 INFINITI 4th. Gear Malfunction
P0734 JEEP Gear Ratio Error In Fourth Gear
P0734 KIA Fourth Gear Incorrect Ratio
P0734 LAND-ROVER Gear 4 Incorrect Ratio
P0734 LEXUS Gear 4 Incorrect Ratio
P0734 MAZDA Fourth Gear Error
P0734 MERCEDES-BENZ Gear 4 Incorrect ratio
P0734 MINI Gear 4 Incorrect ratio
P0734 MITSUBISHI Gear 4 Incorrect Ratio
P0734 NISSAN 4th. Gear Malfunction
P0734 SATURN Gear 4 Incorrect Ratio
P0734 SUBARU Gear 4 Incorrect Ratio
P0734 SUZUKI Gear 4 Incorrect Ratio
P0734 TOYOTA Gear 4 Incorrect Ratio
P0734 VOLKSWAGEN Gear 4 Incorrect Ratio
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