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U1400 Chrysler Code - Implausible TPS Signal Received

Quick Answer

The U1400 Chrysler code indicates that an implausible Throttle Position Sensor (TPS) signal has been received by the vehicle's Engine Control Module (ECM). Common causes include Faulty TPS sensor, Wiring or connector issues in the TPS circuit, ECM software or hardware problems. 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 Chrysler indicates Implausible TPS Signal Received.
Common causes
Common causes include Faulty TPS sensor, Wiring or connector issues in the TPS circuit, ECM software or hardware problems.
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 06, 2024
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Code U1400 Chrysler Description

The U1400 Chrysler 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 monitors the position of the throttle valve, which determines how much air enters the engine. This information is crucial for the ECM to calculate the correct air-fuel mixture and control the engine's performance. An implausible TPS signal can lead to incorrect fuel delivery, affecting the engine's performance, fuel efficiency, and emissions. If not addressed, this issue can potentially cause drivability problems, poor acceleration, stalling, or even engine misfires.

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

Common Causes of U1400 Chrysler

  1. Faulty TPS sensor
  2. Wiring or connector issues in the TPS circuit
  3. ECM software or hardware problems
  4. Throttle body issues
  5. Mechanical problems with the throttle valve

Symptoms of U1400 Chrysler

  1. Rough idling or stalling
  2. Reduced engine power
  3. Hesitation or surging during acceleration
  4. Illuminated Check Engine Light
  5. Poor fuel efficiency

How to Fix U1400 Chrysler

  1. Begin by diagnosing the TPS sensor using a scan tool to verify the implausible signal and check for any related trouble codes.
  2. Inspect the TPS sensor, wiring, and connectors for any visible damage or corrosion. Replace any faulty components.
  3. Test the TPS sensor's voltage output and resistance to ensure it is within specifications.
  4. Reset the ECM and perform a relearn procedure to recalibrate the TPS sensor.
  5. If the issue persists, consider inspecting the throttle body for any mechanical issues or carbon buildup that could affect TPS sensor operation.

Cost to Fix U1400 Chrysler

The cost of repairing an implausible TPS signal can vary depending on the specific issue causing the problem. On average, replacing a faulty TPS sensor can range from $50 to $200, while addressing wiring or connector issues may cost around $100 to $300. Labor costs can add an additional $80 to $150 per hour, and the total repair cost could amount to $200 to $500 or more. It's advisable to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model, as well as the extent of the issue.

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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 Chrysler Code

1. What are common symptoms of the U1400 OBDII code in a Chrysler vehicle?

- Common symptoms include engine stalling, rough idling, decreased fuel efficiency, and issues with acceleration.

2. What can cause the U1400 OBDII code to appear in a Chrysler vehicle?

- The U1400 code typically indicates an implausible Throttle Position Sensor (TPS) signal, which may be caused by a faulty TPS, wiring issues, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the U1400 code in my Chrysler vehicle?

- Diagnosing the U1400 code usually involves using an OBDII scanner to retrieve the code, checking the TPS wiring and connections, testing the TPS voltage, and inspecting the ECM for any signs of damage.

4. Is it safe to continue driving with the U1400 code present in a Chrysler vehicle?

- It is not recommended to continue driving with the U1400 code, as it can lead to further damage to the vehicle and potentially unsafe driving conditions.

5. How can I repair the U1400 OBDII code in my Chrysler vehicle?

- Repairing the U1400 code may involve replacing the TPS sensor, repairing any damaged wiring, or reprogramming the ECM. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. Can a DIY enthusiast fix the U1400 code issue in a Chrysler vehicle?

- While some experienced DIY enthusiasts may be able to diagnose and repair the U1400 code, it is recommended to seek professional help due to the complexity of the system and the importance of proper diagnosis and repair.

7. What are the potential long-term effects of ignoring the U1400 code in a Chrysler vehicle?

- Ignoring the U1400 code can lead to decreased engine performance, increased fuel consumption, and potential damage to other engine components over time.

8. How much does it typically cost to repair the U1400 code in a Chrysler vehicle?

- The cost of repairing the U1400 code can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

9. Can weather conditions affect the appearance of the U1400 code in a Chrysler vehicle?

- Extreme weather conditions such as high humidity or temperature fluctuations can sometimes cause temporary issues with the TPS signal, leading to the appearance of the U1400 code.

10. How often should I check the TPS sensor in my Chrysler vehicle to prevent the U1400 code from appearing?

- It is recommended to have the TPS sensor checked during regular maintenance intervals or if you experience any symptoms of TPS-related issues to prevent the U1400 code from appearing.

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