AutoCodes – Generic – U1426

U1426 Code - Implausible TCC Slip Request Signal Received

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Transmission Control Module (TCM) receives an implausible Torque Converter Clutch (TCC) slip request Electronically-Modulated Converter Clutch (EMCC) from the Powertrain Control Module (PCM). Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection. 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: U1426 indicates Implausible TCC Slip Request Signal Received.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection.
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 1,827

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1426 Description

OBDII Code U1426 - Implausible TCC Slip Request Signal Received - AutoCodes.com — U1426 Code - Implausible TCC Slip Request Signal Received

What does this mean?

What are the Possible Causes of the DTC U1426?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U1426?

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 U1426 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 U1426 code?

Need more information on how to fix the U1426 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1426 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1426 Chrysler — Implausible TCC Slip Request Signal Received
U1426 Dodge — Implausible TCC Slip Request Signal Received
U1426 Jeep — Implausible TCC Slip Request Signal Received
U1426 RAM — Implausible TCC Slip Request Signal Received

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 U1426 Code

1. What are common symptoms of OBDII code U1426?

- Common symptoms of OBDII code U1426 include erratic transmission shifts, poor acceleration, and a lit up check engine light.

2. What does the OBDII code U1426 indicate?

- The code U1426 indicates that an implausible Torque Converter Clutch (TCC) Slip Request Signal has been received by the vehicle's powertrain control module.

3. What are possible causes of code U1426?

- Possible causes of code U1426 include faulty TCC solenoid, wiring issues in the TCC circuit, low transmission fluid levels, or a malfunctioning transmission control module.

4. How can I diagnose the cause of OBDII code U1426?

- Diagnosing the cause of code U1426 involves conducting a thorough inspection of the TCC circuit, checking the TCC solenoid for proper operation, and ensuring the transmission fluid levels are adequate.

5. Can I continue driving with OBDII code U1426?

- It is not recommended to continue driving with OBDII code U1426 as it can lead to further damage to the transmission system. It is advisable to address the issue promptly.

6. How can I repair OBDII code U1426?

- Repairing OBDII code U1426 involves fixing the root cause of the issue, which may include replacing a faulty TCC solenoid, repairing wiring issues, or addressing any other underlying transmission problems.

7. Will resetting the OBDII code U1426 make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing code U1426 is not addressed, the code is likely to reappear.

8. Can a DIY enthusiast fix OBDII code U1426?

- Depending on the level of expertise and access to tools, a DIY enthusiast may be able to fix OBDII code U1426 by following proper diagnostic procedures and repair steps outlined in the vehicle's service manual.

9. Is OBDII code U1426 a common issue in certain vehicle makes or models?

- OBDII code U1426 can be more prevalent in certain vehicle makes and models, particularly those with specific transmission systems that are prone to TCC-related problems.

10. How much does it cost to repair OBDII code U1426 at a professional auto repair shop?

- The cost of repairing OBDII code U1426 at a professional auto repair shop can vary depending on the underlying issue, parts needed for replacement, and labor costs. It is recommended to obtain a detailed quote from a reputable repair facility.