AutoCodes – MINI – P0735 MINI

P0735 MINI Code - Gear 5 Incorrect ratio

Quick Answer

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. Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0735 MINI indicates Gear 5 Incorrect ratio.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,685

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0735 MINI 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 MINI - Gear 5 Incorrect ratio - AutoCodes.com — P0735 MINI Code - Gear 5 Incorrect ratio

What does this mean?

What are the Possible Causes of the DTC P0735 MINI?

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

How to Fix the DTC P0735 MINI?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0735 MINI code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0735 MINI code?

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0735 MINI Code

1. What does the OBDII code P0735 mean on a MINI?

P0735 indicates that the transmission control module (TCM) has detected an incorrect gear ratio in 5th gear, often due to a mechanical, hydraulic, or electronic issue.

2. What are the common symptoms of the P0735 code in a MINI?

Symptoms may include difficulty shifting into or out of 5th gear, slipping in 5th gear, reduced fuel efficiency, transmission overheating, or the illumination of the check engine light.

3. What causes the P0735 Gear 5 Incorrect Ratio code in a MINI?

Common causes include low transmission fluid, a faulty shift solenoid, worn clutch packs, damaged gear components, or issues with the transmission control module (TCM).

4. Can I drive my MINI with the P0735 code?

While it may still be drivable, continuing to drive with this code can lead to further damage to the transmission, so itâ€™s best to address the issue as soon as possible.

5. How do I fix the P0735 code on my MINI?

Repairs might include checking and refilling transmission fluid, replacing a faulty shift solenoid, repairing or replacing worn clutch packs, or addressing internal transmission damage.

6. How do I diagnose a P0735 code in a MINI?

Diagnosis typically involves scanning for additional codes, inspecting the transmission fluid, testing the shift solenoids, and performing a transmission pressure test.

7. Can low transmission fluid cause the P0735 code?

Yes, low or dirty transmission fluid can lead to improper hydraulic pressure, causing the 5th gear ratio to be incorrect.

8. How much does it cost to fix the P0735 code on a MINI?

The cost varies depending on the issue, ranging from $100 for a fluid change to over $1,000 for major transmission repairs.

9. Is the P0735 code specific to MINI vehicles?

No, the P0735 code is a generic OBDII code that can appear on many vehicles, but repair steps may vary depending on the make and model.

10. Can a software update fix the P0735 code in my MINI?

In some cases, a TCM software update from the dealership may resolve the issue, especially if the problem is related to incorrect gear ratio calculations.