AutoCodes – Chrysler – U1146 Chrysler

U1146 Chrysler Code - Lost Communication With External Memory

Quick Answer

The first time the vehicle is started, the Transmission Control Module (TCM) receives hydraulic calibration data from an external EEPROM (located in the transmission) and stores this information in the EEPROM of the TCM. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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: U1146 Chrysler indicates Lost Communication With External Memory.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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 2,982

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1146 Chrysler Description

The first time the vehicle is started, the Transmission Control Module (TCM) receives hydraulic calibration data from an external EEPROM (located in the transmission) and stores this information in the EEPROM of the TCM. If the TCM can not read the external EEPROM in the transmission this DTC will set. It takes two consecutive failures to turn on the MIL.

OBDII Code U1146 Chrysler - Lost Communication With External Memory - AutoCodes.com — U1146 Chrysler Code - Lost Communication With External Memory

What does this mean?

What are the Possible Causes of the DTC U1146 Chrysler?

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

How to Fix the DTC U1146 Chrysler?

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 U1146 Chrysler 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 more information on how to fix the U1146 Chrysler code? Get Access to Factory Service Manuals

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Get the U1146 Chrysler code diagnosed by a professional: Find a repair shop in your area

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 U1146 Chrysler Code

1. What are the common symptoms of OBDII code U1146 in a Chrysler vehicle?

- Common symptoms include issues with the vehicle's transmission, dashboard lights remaining on, and difficulty in starting the engine.

2. What does the OBDII code U1146 "Lost Communication With External Memory" mean in a Chrysler vehicle?

- This code indicates a problem with the communication between the vehicle's onboard computer system and an external memory device.

3. What are the possible causes of OBDII code U1146 in a Chrysler vehicle?

- Possible causes include a faulty external memory device, damaged wiring or connectors, a malfunctioning control module, or a software issue.

4. How can I diagnose the issue causing OBDII code U1146 in my Chrysler vehicle?

- Diagnose the issue by checking the wiring and connectors for any damage, verifying the external memory device's functionality, and using a diagnostic scan tool to communicate with the control module.

5. What are some repair tips for fixing OBDII code U1146 in a Chrysler vehicle?

- Repair tips include repairing or replacing damaged wiring and connectors, ensuring the external memory device is functioning correctly, and reprogramming the control module if necessary.

6. Can I drive my Chrysler vehicle with OBDII code U1146 present?

- It is not recommended to drive the vehicle with this code present, as it may lead to further issues and potentially affect the vehicle's performance and safety.

7. How much does it typically cost to repair OBDII code U1146 in a Chrysler vehicle?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $500 for parts and labor.

8. Will resetting the OBDII code U1146 in my Chrysler vehicle make the problem go away?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the communication problem with the external memory.

9. Is it possible to prevent OBDII code U1146 from appearing in my Chrysler vehicle?

- Regular maintenance checks, proper handling of electronic components, and timely repairs of any related issues can help prevent the recurrence of this code.

10. Can a DIY enthusiast repair OBDII code U1146 in a Chrysler vehicle, or should I seek professional help?

- While some basic checks and repairs can be done by a DIY enthusiast, diagnosing and fixing complex issues related to U1146 may require professional expertise and specialized tools.