AutoCodes – Generic – P1D90

P1D90 Code - Incorrect Gear Ratio Clutch 2 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: P1D90 indicates Incorrect Gear Ratio Clutch 2 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 11,697

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 P1D90 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 fixed gear, during gear engagement, and during shifting from one gear to another.

OBDII Code P1D90 - Incorrect Gear Ratio Clutch 2 Defective - AutoCodes.com — P1D90 Code - Incorrect Gear Ratio Clutch 2 Defective

What does this mean?

What are the Possible Causes of the DTC P1D90?

Faulty Transmission Internal Components

How to Fix the DTC P1D90?

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 P1D90 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 P1D90 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1D90 Chrysler — Incorrect Gear Ratio Clutch 2 Defective
P1D90 Dodge — Incorrect Gear Ratio Clutch 2 Defective
P1D90 Fiat — Incorrect Gear Ratio Clutch 2 Defective
P1D90 Jeep — Incorrect Gear Ratio Clutch 2 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 P1D90 Code

1. What are the common symptoms of OBDII code P1D90 - Incorrect Gear Ratio Clutch 2 Defective?

- Common symptoms include harsh shifting, slippage, delayed engagement, and possibly a Check Engine Light.

2. What can cause the OBDII code P1D90 to trigger?

- The code P1D90 can be triggered by a defective clutch in gear 2, issues with transmission fluid pressure, or problems with the transmission control module.

3. How serious is the OBDII code P1D90 - Incorrect Gear Ratio Clutch 2 Defective?

- This code should be addressed promptly as it can lead to further transmission damage if left unresolved.

4. Can driving with the OBDII code P1D90 cause further damage to the vehicle?

- Continuing to drive with the P1D90 code can potentially cause additional stress on the transmission components, leading to further damage.

5. How can I diagnose the OBDII code P1D90 on my vehicle?

- Proper diagnosis of the P1D90 code requires a professional scan tool to read the transmission control module's data and pinpoint the exact issue.

6. What are some common repair tips for fixing the OBDII code P1D90?

- Repairing the P1D90 code may involve inspecting and replacing the clutch in gear 2, checking transmission fluid levels, and ensuring proper transmission control module operation.

7. Is it possible to reset the OBDII code P1D90 without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause to prevent further transmission problems.

8. How much does it typically cost to repair the OBDII code P1D90?

- The cost of repairing the P1D90 code can vary depending on the extent of the issue, but it may involve replacing the clutch, servicing the transmission, or recalibrating the transmission control module.

9. Can a DIY enthusiast fix the OBDII code P1D90 at home?

- Repairing the P1D90 code may involve complex transmission work, so it is recommended to consult a professional mechanic or transmission specialist for proper diagnosis and repair.

10. Are there any preventative maintenance tips to avoid triggering the OBDII code P1D90?

- Regularly servicing your transmission, checking transmission fluid levels, and addressing any unusual shifting behavior promptly can help prevent issues that may trigger the P1D90 code.