OBD Code P0734

Gear 4 Incorrect Ratio

What’s mean?

OBD2 Code P0734 Definition:
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.

Symptoms

Possible sumptoms of P0734
– Engine Light ON (or Service Engine Soon Warning Light) – Incorrect transmission shifting

Possible Causes

Possible causes of P0734
– Low transmission fluid level – Dirty transmission fluid – Shift solenoids – Transmission mechanical problems – Transmission hydraulic control circuit The Error code is generally activated on detection of the following conditions: P0734 is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good.

Possible Solutions