AutoCodes – Generic – U1460

U1460 Code - Engine Idle Speed Message Rationality

Quick Answer

This diagnostic checks the availability and rationality of the Engine Idle Speed signal which is sent by the Engine Control Module (ECM) via a Controller Area Network (CAN) message. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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: U1460 indicates Engine Idle Speed Message Rationality.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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 1,531

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 May 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1460 Description

This diagnostic checks the availability and rationality of the Engine Idle Speed signal which is sent by the Engine Control Module (ECM) via a Controller Area Network (CAN) message. The diagnostic determines the availability by checking the received value is not equal to the Signal Not Available (SNA) default value. Then the diagnostic checks the rationality by confirming the signal value is within the range defined by a lower and upper threshold. When the CAN signal value is below a calibratable lower threshold or it exceeds a calibratable upper threshold or the signal is not available, the Powertrain Control Module (PCM) sends a Signal Not Available (SNA) default value to the PCM. When the PCM reads one of these conditions then the Diagnostic Trouble Code (DTC) U1460 is set.

OBDII Code U1460 - Engine Idle Speed Message Rationality - AutoCodes.com — U1460 Code - Engine Idle Speed Message Rationality

What does this mean?

What are the Possible Causes of the DTC U1460?

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

How to Fix the DTC U1460?

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 U1460 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 U1460 code?

Need more information on how to fix the U1460 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1460 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1460 Chrysler — Engine Idle Speed Message Rationality
U1460 Dodge — Engine Idle Speed Message Rationality
U1460 Jeep — Engine Idle Speed Message Rationality
U1460 RAM — Engine Idle Speed Message Rationality

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 U1460 Code

1. What are common symptoms of OBDII code U1460 (Engine Idle Speed Message Rationality)?

- Common symptoms include rough idle, stalling at idle, and poor engine performance.

2. What can cause OBDII code U1460 to trigger?

- This code can be triggered by issues with the idle speed control system, such as a faulty idle air control valve or throttle body.

3. How can I diagnose the cause of OBDII code U1460?

- Diagnosing this code may require checking the idle air control valve, throttle body, vacuum leaks, and the wiring/connectors related to the idle speed control system.

4. Are there any simple repair tips for fixing OBDII code U1460?

- Simple repair tips include cleaning the idle air control valve, checking for vacuum leaks, and ensuring proper connection of wiring harnesses.

5. Can a dirty throttle body cause OBDII code U1460 to appear?

- Yes, a dirty or clogged throttle body can disrupt the idle speed control system and potentially trigger code U1460.

6. Is it safe to drive with OBDII code U1460 present?

- It is not recommended to drive with this code present, as it can lead to engine performance issues and potential stalling.

7. How can I reset OBDII code U1460 after making repairs?

- After making necessary repairs, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

8. Can a low battery voltage trigger OBDII code U1460?

- Yes, low battery voltage can affect the performance of the engine idle speed control system and potentially trigger this code.

9. What role does the engine control module (ECM) play in OBDII code U1460?

- The ECM monitors the engine's idle speed control system and can trigger code U1460 when it detects a rationality issue.

10. Is professional help required to diagnose and repair OBDII code U1460?

- While some DIY troubleshooting is possible, seeking professional help from a mechanic with experience in engine performance issues is recommended for accurate diagnosis and repair.