Engine-Codes.com
Engine-Codes – Chrysler – U1401 Chrysler

U1401 Chrysler Code - Implausible Engine Speed Signal Received

Quick Answer

The U1401 Chrysler diagnostic trouble code (DTC) indicates that an implausible engine speed signal has been received by the engine control module (ECM). Common causes include Faulty crankshaft position sensor, Damaged wiring or connectors in the engine speed signal circuit, ECM software glitches or malfunctions. 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
U1401 Chrysler indicates Implausible Engine Speed Signal Received.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged wiring or connectors in the engine speed signal circuit, ECM software glitches or malfunctions.
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 14, 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 U1401 Chrysler Description

The U1401 Chrysler diagnostic trouble code (DTC) indicates that an implausible engine speed signal has been received by the engine control module (ECM). This means that the ECM has detected a discrepancy between the expected engine speed signal and the actual engine speed signal being received. Engine speed, also known as RPM (revolutions per minute), is a crucial parameter for the ECM to accurately control fuel injection timing, ignition timing, and other engine functions. An inaccurate engine speed signal can lead to poor engine performance, misfires, stalling, and other drivability issues.

OBDII Code U1401 Chrysler - Implausible Engine Speed Signal Received
U1401 Chrysler Code - Implausible Engine Speed Signal Received

Common Causes of U1401 Chrysler

  1. Faulty crankshaft position sensor.
  2. Damaged wiring or connectors in the engine speed signal circuit.
  3. ECM software glitches or malfunctions.
  4. Engine mechanical issues affecting engine speed detection.
  5. Poor electrical connections or grounds.

Symptoms of U1401 Chrysler

  1. Check Engine Light (CEL) illuminated on the dashboard.
  2. Engine misfires or hesitation during acceleration.
  3. Rough idling or stalling.
  4. Decreased fuel efficiency.
  5. Loss of power or performance.

How to Fix U1401 Chrysler

  1. Use a diagnostic scan tool to retrieve the fault codes and confirm the U1401 code.
  2. Inspect the crankshaft position sensor and its wiring for any damage or corrosion.
  3. Test the engine speed signal circuit for continuity and proper voltage.
  4. Clear the fault codes and reset the ECM to see if the code returns.
  5. If the issue persists, replace the faulty components (e.g., crankshaft position sensor, wiring) and retest the system.

Cost to Fix U1401 Chrysler

The typical repair costs for addressing an implausible engine speed signal code like U1401 Chrysler can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

Need more information about the U1401 Chrysler code?

Need more information on how to fix the U1401 Chrysler code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1401 Chrysler code diagnosed by a professional: Find a repair shop in your area

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 U1401 Chrysler Code

1. What are the common symptoms of OBDII code U1401 in a Chrysler vehicle?

The common symptoms of U1401 include the Check Engine Light (CEL) coming on, erratic engine performance, stalling, and issues with starting the vehicle.

2. What does the OBDII code U1401 "Implausible Engine Speed Signal Received" mean in a Chrysler?

U1401 indicates that the Engine Control Module (ECM) has detected an implausible engine speed signal, which could be caused by a communication error between modules or a fault in the engine speed sensor.

3. What are the possible causes of OBDII code U1401 in a Chrysler?

Possible causes of U1401 include a faulty engine speed sensor, wiring issues, a defective ECM, a communication error between modules, or a software glitch in the vehicle's system.

4. How can I diagnose OBDII code U1401 in my Chrysler?

Diagnosing U1401 typically involves using a diagnostic scanner to retrieve the code, checking the engine speed sensor and related wiring for faults, and performing a communication system test to identify any module communication issues.

5. Can I continue driving my Chrysler with OBDII code U1401 active?

It is not recommended to drive your vehicle with an active U1401 code, as it can lead to further engine performance issues, stalling, and potential safety risks. It's best to address the problem promptly.

6. How can I repair OBDII code U1401 in my Chrysler?

Repairing U1401 may involve replacing the engine speed sensor, repairing any damaged wiring, reprogramming or replacing the ECM, addressing communication system faults, or updating software to resolve the issue.

7. Is it possible to reset OBDII code U1401 in a Chrysler without repairing the underlying issue?

While you can clear the code temporarily, it will likely reappear if the root cause of the problem is not addressed. It's essential to diagnose and repair the issue to prevent ongoing issues.

8. Are there any DIY tips for troubleshooting OBDII code U1401 in a Chrysler?

DIY tips for troubleshooting U1401 include checking for loose or damaged wiring, ensuring all connections are secure, and performing a visual inspection of the engine speed sensor for any obvious issues.

9. How long does it usually take to repair OBDII code U1401 in a Chrysler?

The repair time for U1401 can vary depending on the specific cause of the issue. Simple fixes like sensor replacement may take an hour or two, while more complex issues involving module communication may require more time.

10. Can a mechanic help me fix OBDII code U1401 in my Chrysler, or do I need to visit a dealership?

A qualified mechanic should be able to diagnose and repair U1401 in your Chrysler. However, if the issue requires specialized tools, software updates, or ECM replacement, a dealership may be better equipped to handle the repair.

Discuss the causes and fixes for U1401 Chrysler OBDII Code

Submit a New Comment

Code U1401 Chrysler comments

No comments found for this page.