AutoCodes – Generic – U1400

U1400 Code - Implausible TPS Signal Received

Quick Answer

The purpose of the diagnostic is to monitor the Controller Area Network (CAN) BUS, the transmitted messages on the CAN BUS and the validity of the CAN signals. Common causes include Check for Powertrain Control Module (PCM) codes, 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: U1400 indicates Implausible TPS Signal Received.
Common causes: Common causes include Check for Powertrain Control Module (PCM) codes, 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 12,017

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 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1400 Description

The purpose of the diagnostic is to monitor the Controller Area Network (CAN) BUS, the transmitted messages on the CAN BUS and the validity of the CAN signals. Several control units are connected to the CAN BUS which send their messages cyclically in a defined time window. The messages contain multiple signals representing vehicle information. The Diagnostic Trouble Code (DTC) sets when the Transmission Control Module (TCM) detects an incorrect CAN ID from the Powertrain Control Module (PCM).

OBDII Code U1400 - Implausible TPS Signal Received - AutoCodes.com — U1400 Code - Implausible TPS Signal Received

What does this mean?

What are the Possible Causes of the DTC U1400?

Check for Powertrain Control Module (PCM) codes
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 U1400?

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 U1400 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 U1400 code?

Need more information on how to fix the U1400 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1400 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1400 Chrysler — Implausible TPS Signal Received
U1400 Dodge — Implausible TPS Signal Received
U1400 Jeep — Implausible TPS Signal Received
U1400 RAM — Implausible TPS Signal Received

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 U1400 Code

1. What are the common symptoms of an U1400 OBDII code?

- Common symptoms include rough idling, poor acceleration, stalling, and potential loss of power while driving.

2. What can cause the U1400 OBDII code to trigger?

- The U1400 code is typically triggered by a faulty throttle position sensor (TPS), wiring issues, or a malfunction in the electronic throttle control system.

3. How can I diagnose the cause of an U1400 code?

- To diagnose the issue, you can use a scan tool to check for the specific details of the code, inspect the TPS and its wiring for any damage, and perform a thorough visual inspection of the throttle system components.

4. Is it safe to drive with an U1400 OBDII code?

- It is not recommended to drive with an U1400 code as it can lead to performance issues and potentially unsafe driving conditions. It's best to address the issue promptly.

5. Can I repair an U1400 code on my own?

- While some DIY enthusiasts may attempt to address the issue themselves, it is recommended to have a qualified mechanic diagnose and repair the underlying cause of the U1400 code to ensure a proper fix.

6. How much does it typically cost to repair an U1400 OBDII code?

- The cost of repairing an U1400 code can vary depending on the root cause of the issue and the labor rates in your area. It's best to obtain quotes from different mechanics to compare prices.

7. Are there any quick fixes for an U1400 code?

- Quick fixes such as resetting the code using a scan tool or tightening loose wiring connections may temporarily alleviate the issue, but it's important to address the root cause for a lasting repair.

8. Can a bad TPS sensor cause other codes besides U1400?

- Yes, a malfunctioning TPS sensor can trigger other related codes such as P0121, P0122, or P0123, which are all related to throttle position sensor performance.

9. How long does it take to repair an U1400 OBDII code?

- The repair time for an U1400 code can vary depending on the specific cause of the issue, but it typically takes a few hours to diagnose and repair the problem.

10. Is it possible for the U1400 code to come back after being cleared?

- If the underlying issue causing the U1400 code is not properly addressed, it is possible for the code to reappear after being cleared. It's important to ensure a thorough repair is conducted to prevent this.