AutoCodes – Generic – U2472

U2472 Code - Unexpected Ignition State

Quick Answer

The Instrument Cluster (IC) receives both the RUN/START and keep alive voltage from the Smart Junction Box (SJB). Common causes include Faulty Smart Junction Box (SJB), Smart Junction Box harness is open or shorted, Smart Junction Box 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: U2472 indicates Unexpected Ignition State.
Common causes: Common causes include Faulty Smart Junction Box (SJB), Smart Junction Box harness is open or shorted, Smart Junction Box 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 2,672

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 Jun 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2472 Description

The Instrument Cluster (IC) receives both the RUN/START and keep alive voltage from the Smart Junction Box (SJB). The Diagnostic Trouble Code (DTC) sets in the IC when it detects a discrepancy between the hardwired voltage input and the messaged ignition state inputs from the SJB for greater than 5 seconds when the ignition switch is in the RUN position.

OBDII Code U2472 - Unexpected Ignition State - AutoCodes.com — U2472 Code - Unexpected Ignition State

What does this mean?

What are the Possible Causes of the DTC U2472?

Faulty Smart Junction Box (SJB)
Smart Junction Box harness is open or shorted
Smart Junction Box circuit poor electrical connection
Faulty Instrument Cluster (IC)

How to Fix the DTC U2472?

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 U2472 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 U2472 code?

Need more information on how to fix the U2472 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2472 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2472 Ford — Unexpected Ignition State
U2472 Lincoln — Unexpected Ignition State
U2472 Mercury — Unexpected Ignition State

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 U2472 Code

1. What are the common symptoms of OBDII code U2472 (Unexpected Ignition State)?

- Common symptoms include difficulties starting the vehicle, rough idling, and poor engine performance.

2. What can cause the OBDII code U2472 to trigger?

- This code can be triggered by a faulty ignition switch, a malfunctioning ignition control module, or wiring issues.

3. How can I diagnose the OBDII code U2472?

- Diagnosing this code requires using a diagnostic scan tool to retrieve the code, checking the ignition system components for faults, and testing the related wiring.

4. What are the possible repair options for OBDII code U2472?

- Repair options may include replacing the faulty ignition switch, repairing or replacing the defective ignition control module, or fixing any damaged wiring connections.

5. Can a DIY enthusiast fix the OBDII code U2472 issue?

- Some simple repairs, such as replacing a faulty ignition switch, can be done by a DIY enthusiast with the necessary tools and knowledge. However, more complex issues may require professional assistance.

6. Are there any safety concerns associated with OBDII code U2472?

- Yes, driving with a malfunctioning ignition system can pose safety risks, as it may lead to unexpected stalling or loss of engine power while on the road.

7. How urgent is it to address the OBDII code U2472 problem?

- It is important to address this issue promptly to prevent potential safety hazards and further damage to the vehicle's engine components.

8. Can the OBDII code U2472 be intermittent?

- Yes, this code can sometimes be intermittent, meaning the issue may come and go, making diagnosis and repair more challenging.

9. Is resetting the OBDII code U2472 sufficient to fix the problem?

- Resetting the code may temporarily clear the error message, but it will not fix the underlying issue causing the Unexpected Ignition State.

10. How can I prevent the OBDII code U2472 from recurring?

- Regularly maintaining the ignition system, including checking and replacing components as needed, can help prevent the OBDII code U2472 from recurring.