P0735 BMW - Gear 5 Incorrect ratio

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

P0735 BMW Possible Causes

  • Low transmission fluid level
  • Dirty transmission fluid
  • Shift solenoids
  • Transmission mechanical problems
  • Transmission hydraulic control circuit

How do I fix code P0735 BMW?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
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Tech Notes

Start by inspecting the transmission fluid level and condition, and change fluid if necessary.

Cost of diagnosing the P0735 BMW code

Labor: 1.0

The cost of diagnosing the P0735 BMW code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the code detected?

P0735 is detected when A/T cannot be shifted to the 5th gear position even if electrical circuit is good.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Incorrect transmission shifting

P0735 BMW 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 (5th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
OBDII Code P0735 Bmw - Gear 5 Incorrect ratio - AutoCodes.com

More Information

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Comments

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