AutoCodes – RAM – U0103 RAM

U0103 RAM 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 RAM 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 1,544

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

What does this mean?

What are the Possible Causes of the DTC U0103 RAM?

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 RAM?

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 RAM 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 RAM Code

1. What does the OBDII code U0103 mean on a RAM vehicle?

U0103 indicates a loss of communication with the Electric Gear Shift Module (EGS), meaning the module is not transmitting or receiving data properly on the vehicleâ€™s communication network.

2. What are the common symptoms of the U0103 code?

Symptoms can include the inability to shift gears, the vehicle being stuck in one gear, warning lights on the dashboard (e.g., Check Engine or Transmission), and erratic gear shifting behavior.

3. What causes the U0103 code to appear?

Common causes include faulty wiring or connectors in the CAN bus network, a malfunctioning Electric Gear Shift Module, a dead or weak vehicle battery, or a failed Powertrain Control Module (PCM).

4. Can a weak battery trigger the U0103 code?

Yes, a weak or dead battery can disrupt communication between the modules, potentially triggering the U0103 code.

5. How do I diagnose the U0103 code on my RAM?

Start by checking the battery voltage and inspecting the wiring and connectors for damage or corrosion. Use an OBDII scanner to ensure the Electric Gear Shift Module can communicate with other modules.

6. Can I drive my RAM with the U0103 code?

It is not recommended to drive with this code, as it may lead to transmission issues, inability to shift gears, or being stuck in a single gear, which can be dangerous.

7. How do you fix the U0103 code?

Repairs may include replacing damaged wiring or connectors, reprogramming or replacing the Electric Gear Shift Module, or addressing battery and voltage issues.

8. Is a replacement of the Electric Gear Shift Module always necessary for a U0103 code?

Not always. The issue could be as simple as a loose connector, damaged wiring, or a low battery. Proper diagnostics are needed before replacing the module.

9. How much does it cost to repair the U0103 code on a RAM vehicle?

Repair costs vary depending on the issue. Wiring repairs can cost $50â€“$200, while replacing the Electric Gear Shift Module may cost $500â€“$1,000 or more, including labor.

10. Can software updates resolve the U0103 code?

In some cases, a software update for the Electric Gear Shift Module or PCM may resolve communication issues and clear the U0103 code. Check with a qualified technician.