AutoCodes – Generic – P1D91

P1D91 Code - Incorrect Gear Ratio Clutch 3 Defective

Quick Answer

The Transmission Control Module (TCM) monitors for conditions which lead to an unexpected transmission gear ratio (e.g. Common causes include Faulty Transmission Internal Components. 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: P1D91 indicates Incorrect Gear Ratio Clutch 3 Defective.
Common causes: Common causes include Faulty Transmission Internal Components.
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 8,786

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 Apr 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1D91 Description

The Transmission Control Module (TCM) monitors for conditions which lead to an unexpected transmission gear ratio (e.g. slipping clutches, hydraulic or mechanical defects, etc.). The TCM compares the actual gear ratio (i.e. the ratio of input speed to output speed) to a minimum and maximum calibrated gear ratio value. The TCM performs this comparison while driving in a fix gear, during gear engagement, and during shifting from one gear to another.

OBDII Code P1D91 - Incorrect Gear Ratio Clutch 3 Defective - AutoCodes.com — P1D91 Code - Incorrect Gear Ratio Clutch 3 Defective

What does this mean?

What are the Possible Causes of the DTC P1D91?

Faulty Transmission Internal Components

How to Fix the DTC P1D91?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1D91 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.

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Need Help with the Code?

Get the P1D91 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1D91 Chrysler — Incorrect Gear Ratio Clutch 3 Defective
P1D91 Dodge — Incorrect Gear Ratio Clutch 3 Defective
P1D91 Fiat — Incorrect Gear Ratio Clutch 3 Defective
P1D91 Jeep — Incorrect Gear Ratio Clutch 3 Defective

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 P1D91 Code

1. What are the common symptoms of OBDII code P1D91, Incorrect Gear Ratio Clutch 3 Defective?

- Common symptoms include rough shifting, hesitation when accelerating, and the transmission slipping or jerking.

2. What are the potential causes of OBDII code P1D91?

- The code P1D91 can be triggered by issues such as a defective clutch 3, faulty transmission components, low transmission fluid, or a malfunctioning clutch actuator.

3. How can I diagnose OBDII code P1D91?

- To diagnose this code, you may need to perform a thorough inspection of the transmission system, check the condition of the clutch 3, and use a diagnostic scanner to read the error codes.

4. Can driving with OBDII code P1D91 cause further damage to my vehicle?

- Continuing to drive with code P1D91 unresolved can potentially lead to further damage to the transmission system, resulting in more costly repairs down the line.

5. How do I repair OBDII code P1D91, Incorrect Gear Ratio Clutch 3 Defective?

- Repairing this code may involve replacing the defective clutch 3, repairing or replacing faulty transmission components, ensuring proper transmission fluid levels, and addressing any issues with the clutch actuator.

6. Are there any DIY tips for resolving OBDII code P1D91?

- While some basic checks like inspecting transmission fluid levels can be done by DIY enthusiasts, diagnosing and repairing the underlying issues of code P1D91 may require professional expertise and specialized tools.

7. How much does it typically cost to repair OBDII code P1D91?

- The cost of repairing OBDII code P1D91 can vary based on the extent of the damage, the specific components needing replacement, and labor costs. It's recommended to get a diagnosis from a qualified mechanic for an accurate estimate.

8. Can resetting the OBDII system clear code P1D91 temporarily?

- Resetting the OBDII system may temporarily clear the code P1D91, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven and the problem is detected again.

9. Is it safe to continue driving with OBDII code P1D91 if the vehicle seems to be running fine?

- Even if the vehicle seems to be running fine with code P1D91 present, it is not recommended to ignore the issue. Continuing to drive with this code can lead to potential transmission problems and safety hazards.

10. How often should I check for OBDII code P1D91 recurrence after repairs?

- After the necessary repairs have been made to address code P1D91, it's advisable to periodically check for any recurrence of the code by monitoring the vehicle's performance and scanning for error codes as a preventive measure.