AutoCodes – Jeep – U0103 Jeep

U0103 Jeep 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 Jeep 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 7,456

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

What does this mean?

What are the Possible Causes of the DTC U0103 Jeep?

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 Jeep?

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 Jeep 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 Jeep Code

1. What are the common symptoms of OBDII code U0103 in a Jeep related to the Electric Gear Shift Module?

- Common symptoms include difficulty shifting gears, the gear shifter not working properly, and the transmission going into limp mode.

2. What are some possible causes of the U0103 code indicating lost communication with the Electric Gear Shift Module in a Jeep?

- Possible causes may include a faulty gear shift module, damaged wiring or connectors, a software issue, or a problem with the vehicle's ECM.

3. How can I diagnose the reason behind the U0103 code in my Jeep affecting the Electric Gear Shift Module?

- A comprehensive diagnostic scan with an OBDII scanner can help pinpoint the exact cause by checking for communication errors between the module and other vehicle systems.

4. What are some recommended repair tips for resolving the U0103 code in a Jeep with Electric Gear Shift Module communication issues?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connection of the gear shift module, updating software, or replacing the module if necessary.

5. Can the U0103 OBDII code affecting the Electric Gear Shift Module in a Jeep be cleared/reset, or does it require a professional repair?

- While the code can be cleared, it is important to address the underlying issue causing the communication problem to prevent it from recurring.

6. Are there any safety concerns associated with driving a Jeep when the U0103 code for lost communication with the Electric Gear Shift Module is present?

- It is recommended to address the issue promptly to avoid potential safety hazards, such as loss of control over the transmission or unexpected gear shifting problems.

7. Is it possible to prevent the U0103 code from appearing in a Jeep by performing regular maintenance or checks on the Electric Gear Shift Module?

- Regular inspections and maintenance of the gear shift module, wiring, and connectors can help prevent issues that may trigger the U0103 code.

8. How long does it typically take to repair the U0103 code linked to the Electric Gear Shift Module in a Jeep?

- The repair time can vary depending on the exact cause of the communication loss, ranging from a quick fix like re-connecting a loose wire to a more involved process of module replacement.

9. Can a DIY enthusiast with basic automotive knowledge tackle the repair for the U0103 code related to the Electric Gear Shift Module in a Jeep?

- Depending on the specific issue, some DIYers may be able to address simpler causes like loose connections, but more complex problems may require professional expertise.

10. How much can I expect to pay for repairing the U0103 code associated with the Electric Gear Shift Module in a Jeep at a dealership or auto repair shop?

- The cost of repairs can vary widely based on the specific diagnosis and required actions, so it's recommended to obtain estimates from different sources before proceeding with the repair.