P0734 Volkswagen Gear 4 Incorrect Ratio

P0734 Volkswagen Gear 4 Incorrect Ratio

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

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2 thoughts on “P0734 Volkswagen Gear 4 Incorrect Ratio

  1. I have an error code po734 on my VW Touran and tried changing the oil, how else can it best be resolved? Can it be fixed without changing the gear box? Please help!

    1. Possible causes
      – Low transmission fluid level
      – Dirty transmission fluid
      – Shift solenoids
      – Transmission mechanical problems
      – Transmission hydraulic control circuit

      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.

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