Engine-Codes.com
Engine-Codes – Generic – U1400

U1400 Code - Implausible TPS Signal Received

Quick Answer

The U1400 code indicates that an implausible Throttle Position Sensor (TPS) signal has been received by the vehicle's Engine Control Module (ECM). Common causes include Malfunctioning TPS sensor, Wiring issues or shorts in the TPS circuit, Faulty ECM. 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 Malfunctioning TPS sensor, Wiring issues or shorts in the TPS circuit, Faulty ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U1400 Description

The U1400 code indicates that an implausible Throttle Position Sensor (TPS) signal has been received by the vehicle's Engine Control Module (ECM). The TPS is a sensor that measures the position of the throttle valve and sends this information to the ECM, which uses it to determine the correct air-fuel mixture for optimal engine performance. An implausible signal means that the voltage or resistance values being reported by the TPS do not align with what the ECM expects based on other sensor readings.

OBDII Code U1400 - Implausible TPS Signal Received
U1400 Code - Implausible TPS Signal Received

Common Causes of U1400

  1. Malfunctioning TPS sensor
  2. Wiring issues or shorts in the TPS circuit
  3. Faulty ECM
  4. Mechanical problems with the throttle body
  5. Corrosion or contamination affecting sensor readings

Symptoms of U1400

  1. Reduced engine performance
  2. Poor fuel efficiency
  3. Rough idling or stalling
  4. Hesitation during acceleration
  5. Engine misfires

How to Fix U1400

  1. Begin by scanning the vehicle's ECM to retrieve the U1400 code and any other related codes for additional context.
  2. Inspect the TPS sensor and wiring for any visible damage or corrosion. Replace the TPS sensor if necessary.
  3. Check the TPS circuit for shorts or open circuits, repairing any wiring issues as needed.
  4. Perform a throttle body inspection to ensure proper operation and cleanliness. Clean or replace the throttle body if necessary.
  5. Clear the fault codes from the ECM and perform a test drive to verify that the issue has been resolved.

Cost to Fix U1400

The cost of repairing an implausible TPS signal can vary depending on the extent of the issue and the specific components that need to be replaced. In general, replacing a TPS sensor can cost between $50 and $200, while addressing wiring issues or replacing the ECM can range from $100 to $500 or more. Labor costs can also add up, with hourly rates typically falling between $80 and $150. It is advisable to consult with a trusted mechanic or auto repair shop for a more accurate cost estimate based on the specific circumstances of your vehicle.

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

Code U1400 Information for Specific Makes

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.

Discuss the causes and fixes for U1400 OBDII Code

Submit a New Comment

Code U1400 comments

No comments found for this page.