AutoCodes – Generic – U1440

U1440 Code - Implausible/Missing Programmed Transfer Case Hi Ratio

Quick Answer

This programmed Transfer Case Hi Ratio information is received from the Totally Integrated Power Module (TIPM) to be used by the Transmission Control Module (TCM) as part of speed sensor diagnostics. 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: U1440 indicates Implausible/Missing Programmed Transfer Case Hi Ratio.
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 3,305

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1440 Description

This programmed Transfer Case Hi Ratio information is received from the Totally Integrated Power Module (TIPM) to be used by the Transmission Control Module (TCM) as part of speed sensor diagnostics. This fault is set when any other values other than 1.0 is received, or the message is not received for more than 10.5 seconds.

OBDII Code U1440 - Implausible/Missing Programmed Transfer Case Hi Ratio - AutoCodes.com — U1440 Code - Implausible/Missing Programmed Transfer Case Hi Ratio

What does this mean?

What are the Possible Causes of the DTC U1440?

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

How to Fix the DTC U1440?

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 U1440 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 U1440 code?

Need more information on how to fix the U1440 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1440 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1440 Chrysler — Implausible/Missing Programmed Transfer Case Hi Ratio
U1440 Dodge — Implausible/Missing Programmed Transfer Case Hi Ratio
U1440 Jeep — Implausible/Missing Programmed Transfer Case Hi Ratio
U1440 RAM — Implausible/Missing Programmed Transfer Case Hi Ratio

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 U1440 Code

1. What are the common symptoms of OBDII code U1440?

- Common symptoms include illuminated warning lights on the dashboard, issues with the transfer case, and difficulty shifting gears.

2. What can cause the OBDII code U1440 to occur?

- This code may be triggered by a malfunction in the transfer case control module, faulty wiring, or a software glitch in the system.

3. How serious is the U1440 code?

- The U1440 code should be addressed promptly as it can affect the performance and drivability of the vehicle, especially in off-road or low-traction situations.

4. Can I continue driving with the U1440 code present?

- It is not recommended to drive the vehicle with the U1440 code active, as it can lead to further damage to the transfer case system.

5. How can I diagnose the U1440 code?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, followed by a thorough inspection of the transfer case control module and related components.

6. What are some repair tips for fixing the U1440 code?

- Repair tips may include checking and repairing any damaged wiring, updating the software in the transfer case control module, or replacing the control module if necessary.

7. Is it possible to reset the U1440 code without fixing the underlying issue?

- While you can clear the code with an OBDII scanner, it is crucial to address the root cause of the problem to prevent the code from reoccurring.

8. How much does it typically cost to repair the U1440 code?

- The cost of repair can vary depending on the exact cause of the issue and the extent of the damage. It is recommended to consult a professional for an accurate estimate.

9. Can a DIY enthusiast fix the U1440 code at home?

- While some simple repairs like checking and securing wiring connections can be done at home, diagnosing and repairing complex issues related to the U1440 code may require professional assistance.

10. How can I prevent the U1440 code from appearing in the future?

- Regular maintenance, including checking and updating software in the transfer case control module, inspecting wiring for damage, and addressing any warning lights promptly, can help prevent the U1440 code from reoccurring.