AutoCodes – Dodge – U0103 Dodge

U0103 Dodge Code - Lost Communication With Electric Gear Shift Module

Quick Answer

The Transmission Control Module (TCM) receives information from the Engine, Anti-lock Brake System, and the Electronic Shift Modules (ESM) over the CAN C bus. Common causes include Electric Gear Shift Module, Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted. 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: U0103 Dodge indicates Lost Communication With Electric Gear Shift Module.
Common causes: Common causes include Electric Gear Shift Module, Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted.
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 5,341

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 Aug 05, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0103 Dodge Description

The Transmission Control Module (TCM) receives information from the Engine, Anti-lock Brake System, and the Electronic Shift Modules (ESM) over the CAN C bus. The CAN C bus is a high-speed communication bus that allows real-time control capability between various controllers. Most messages are sent every 20 mSec, this means critical information can be shared between multiple controllers almost instantaneously. The CAN C bus is a two-wire bus with a CAN (+) and a CAN (-) circuit. To reduce the potential of radio and other electrical noise interference, the CAN Bus circuit wiring is manufactured using a twisted pair configuration within the electrical wiring harness. The Diagnostic Trouble Code (DTC) will set if a valid CAN ID was not received in the required time from the Electronic Gear Shift Module.

OBDII Code U0103 Dodge - Lost Communication With Electric Gear Shift Module - AutoCodes.com — U0103 Dodge Code - Lost Communication With Electric Gear Shift Module

What does this mean?

What are the Possible Causes of the DTC U0103 Dodge?

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

How to Fix the DTC U0103 Dodge?

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 U0103 Dodge 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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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 U0103 Dodge Code

1. What are the common symptoms of OBDII code U0103 in a Dodge vehicle?

- Common symptoms include the gear shifter stuck in park, inability to shift gears, warning lights on the dashboard, and loss of communication with the electric gear shift module.

2. What are the possible causes of OBDII code U0103 in a Dodge?

- The code U0103 typically indicates a communication failure between the vehicle's onboard computer system and the electric gear shift module. Possible causes include wiring issues, a faulty module, or a software malfunction.

3. How can I diagnose the OBDII code U0103 in my Dodge?

- Use an OBDII scanner to retrieve the specific error code, check the wiring connections to the electric gear shift module, and inspect for any visible damage. It may also be helpful to consult a professional mechanic for a more in-depth diagnosis.

4. Can I still drive my Dodge if I have the OBDII code U0103?

- It is not recommended to drive your Dodge with the U0103 code present, as it may lead to safety issues due to potential gear shifting problems. It is best to address the issue promptly to avoid any further complications.

5. How can I repair the OBDII code U0103 in my Dodge?

- Repair options may include checking and repairing any damaged wiring, replacing the electric gear shift module if necessary, and resetting the error code with an OBDII scanner. For complex issues, seeking professional help is advised.

6. Is the OBDII code U0103 a serious issue in a Dodge?

- Yes, the U0103 code is considered a serious issue as it directly affects the communication between the vehicle's computer system and the electric gear shift module, potentially leading to unsafe driving conditions.

7. Can a DIY enthusiast fix the OBDII code U0103 in a Dodge?

- Depending on their skill level, a DIY enthusiast may be able to address simpler causes of the U0103 code, such as checking and repairing wiring connections. However, more complex issues may require professional assistance.

8. How long does it typically take to repair the OBDII code U0103 in a Dodge?

- The repair time for the U0103 code can vary depending on the specific cause and the extent of the issue. Simple fixes like repairing a loose connection may take a short time, while more complex repairs may require more time.

9. Can weather conditions affect the occurrence of the OBDII code U0103 in a Dodge?

- Extreme weather conditions such as moisture or temperature fluctuations can potentially impact the wiring connections and modules, leading to communication issues and triggering the U0103 code in a Dodge.

10. Is there a way to prevent the OBDII code U0103 from recurring in my Dodge?

- Regular maintenance checks, ensuring proper wiring connections, and addressing any issues promptly can help prevent the reoccurrence of the U0103 code in your Dodge.