AutoCodes – Generic – U103C

U103C Code - Keyless Ignition Node Communication

Quick Answer

The Diagnostic Trouble Code (DTC) sets whenever the Radio Frequency Hub (RF Hub) senses an open, or a short to ground on the Security Keyless Line Communication circuit. Common causes include Faulty Keyless Ignition Node (KIN), Keyless Ignition Node harness is open or shorted, Keyless Ignition Node 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: U103C indicates Keyless Ignition Node Communication.
Common causes: Common causes include Faulty Keyless Ignition Node (KIN), Keyless Ignition Node harness is open or shorted, Keyless Ignition Node 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 7,621

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 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U103C Description

The Diagnostic Trouble Code (DTC) sets whenever the Radio Frequency Hub (RF Hub) senses an open, or a short to ground on the Security Keyless Line Communication circuit.

OBDII Code U103C - Keyless Ignition Node Communication - AutoCodes.com — U103C Code - Keyless Ignition Node Communication

What does this mean?

What are the Possible Causes of the DTC U103C?

Faulty Keyless Ignition Node (KIN)
Keyless Ignition Node harness is open or shorted
Keyless Ignition Node circuit poor electrical connection
Faulty Radio Frequency Hub (RF Hub)

How to Fix the DTC U103C?

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 U103C 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 U103C code?

Need more information on how to fix the U103C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U103C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U103C Chrysler — Keyless Ignition Node Communication
U103C Dodge — Keyless Ignition Node Communication
U103C Jeep — Keyless Ignition Node Communication
U103C RAM — Keyless Ignition Node Communication

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 U103C Code

1. What are the common symptoms of OBDII code U103C (Keyless Ignition Node Communication)?

The common symptoms include difficulty starting the vehicle, intermittent starting issues, and failure of the keyless entry system.

2. What are the possible causes of OBDII code U103C?

Possible causes of this code include faulty key fob, issues with the keyless ignition node, wiring problems, or a communication error within the system.

3. How can I diagnose OBDII code U103C?

Diagnosing this code typically involves using a professional OBDII scanner to retrieve the specific fault codes, checking the key fob battery, inspecting the keyless ignition node connections, and testing the wiring for any faults.

4. Can I drive my vehicle with OBDII code U103C?

It is not recommended to drive your vehicle with this code present, as it can lead to potential starting issues or failure of the keyless entry system while driving.

5. How can I repair OBDII code U103C?

Repairing this code may involve replacing a faulty key fob, repairing or replacing the keyless ignition node, addressing any wiring issues, or reprogramming the keyless entry system.

6. Can OBDII code U103C be triggered by a dead key fob battery?

Yes, a dead key fob battery can trigger this code as it can lead to communication issues between the key fob and the keyless ignition node.

7. Are there any DIY tips for fixing OBDII code U103C?

DIY tips for fixing this code include checking and replacing the key fob battery, inspecting the keyless ignition node connections for corrosion, and ensuring all wiring connections are secure.

8. Will resetting the vehicle's computer clear OBDII code U103C?

Resetting the vehicle's computer may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.

9. How much does it typically cost to repair OBDII code U103C?

The cost of repairing this code can vary depending on the root cause of the issue, but it may range from a simple key fob battery replacement to a more involved repair of the keyless ignition node.

10. Can OBDII code U103C affect other systems in the vehicle?

Yes, this code can potentially affect other systems in the vehicle, especially if it leads to starting issues or malfunctions in the keyless entry system.