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Engine-Codes – Generic – U148C

U148C Code - Implausible Data Received From Stop/Start Button

Quick Answer

The U148C code indicates that the vehicle's onboard computer has detected implausible data being received from the stop/start button. Common causes include Faulty stop/start button, Wiring issue or short circuit in the stop/start system, Software glitch in the vehicle's 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
U148C indicates Implausible Data Received From Stop/Start Button.
Common causes
Common causes include Faulty stop/start button, Wiring issue or short circuit in the stop/start system, Software glitch in the vehicle's 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
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Code U148C Description

The U148C code indicates that the vehicle's onboard computer has detected implausible data being received from the stop/start button. In modern vehicles equipped with stop/start technology, the system is designed to automatically shut off the engine when the vehicle comes to a stop, such as at a traffic light, and then restart it when the driver releases the brake pedal. This feature is intended to improve fuel efficiency and reduce emissions by reducing unnecessary idling.

OBDII Code U148C - Implausible Data Received From Stop/Start Button
U148C Code - Implausible Data Received From Stop/Start Button

Common Causes of U148C

  1. Faulty stop/start button
  2. Wiring issue or short circuit in the stop/start system
  3. Software glitch in the vehicle's ECM
  4. Communication error between the stop/start button and the ECM
  5. Faulty electronic control module (ECM)

Symptoms of U148C

  1. The stop/start system may not engage or disengage as expected.
  2. The engine may not automatically shut off when the vehicle comes to a stop.
  3. The engine may not restart when the driver releases the brake pedal.
  4. The stop/start button may not respond when pressed.
  5. The vehicle may display a warning light on the dashboard indicating a problem with the stop/start system.

How to Fix U148C

  1. Diagnose the issue by using a diagnostic scanner to retrieve the fault codes and pinpoint the exact cause of the problem.
  2. Inspect the stop/start button and wiring for any visible signs of damage or wear. Replace any faulty components.
  3. Check for any software updates for the vehicle's ECM and perform a reprogramming if necessary.
  4. Test the stop/start system to ensure it is functioning properly after repairs have been made.
  5. Clear the fault codes from the vehicle's computer to reset the system.

Cost to Fix U148C

The cost of repairing the U148C code can vary depending on the exact cause of the issue and the labor rates in your area. On average, the repair cost for this type of issue can range from $100 to $300, including parts and labor. However, it's important to note that prices can fluctuate based on the specific make and model of the vehicle, as well as the location and the repair shop chosen. Diagnostic time and labor rates can also impact the overall cost of the repair. It is recommended to consult with a professional mechanic to get an accurate estimate for your specific situation.

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Code U148C Information for Specific Makes

  • U148C Chrysler — Implausible Data Received From Stop/Start Button
  • U148C Dodge — Implausible Data Received From Stop/Start Button
  • U148C Jeep — Implausible Data Received From Stop/Start Button
  • U148C RAM — Implausible Data Received From Stop/Start Button
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 U148C Code

1. What does the OBDII code U148C mean?

The U148C code indicates that the vehicle's control modules have received implausible or inconsistent data from the stop/start button, which may affect functionality.

2. What are the common symptoms of the U148C code?

Symptoms may include the stop/start system not functioning, the engine not starting or shutting off properly, or a check engine light or other warning lights on the dashboard.

3. What causes the U148C code to appear?

Common causes include a faulty stop/start button, wiring or connector issues, a malfunctioning body control module (BCM), or software glitches in the vehicle's communication system.

4. Can I still drive my car with a U148C code?

Yes, you can typically drive the car, but the stop/start system may not operate as intended, and ignoring the issue can lead to further electrical or starting problems.

5. How is the U148C code diagnosed?

A technician will use a diagnostic scanner to read the code, inspect the stop/start button, check wiring and connectors, and test communication between control modules.

6. How do you fix the U148C code?

Repairs may involve replacing the stop/start button, repairing damaged wiring or connectors, reprogramming or updating the BCM, or addressing any software issues.

7. Can a dead battery cause the U148C code?

Yes, a weak or dead battery can cause communication errors between modules, potentially triggering the U148C code.

8. How much does it cost to repair the U148C code?

Repair costs can vary depending on the issue, ranging from $50 for minor wiring fixes to $400 or more if the stop/start button or BCM needs replacement.

9. Can I reset the U148C code without repairs?

While you can clear the code with an OBDII scanner, it may return if the underlying issue is not resolved.

10. Does the U148C code affect other vehicle systems?

It may impact systems that rely on the stop/start button, such as ignition and engine management, but typically does not affect other unrelated systems.

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