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Engine-Codes – Generic – P0728

P0728 Code - Engine Speed Input Circuit Intermittent

Quick Answer

The P0728 diagnostic trouble code indicates that there is an intermittent issue with the engine speed input circuit. Common causes include Faulty engine speed sensor, Loose or corroded wiring connections, Damaged 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
P0728 indicates Engine Speed Input Circuit Intermittent.
Common causes
Common causes include Faulty engine speed sensor, Loose or corroded wiring connections, Damaged 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 13, 2024
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Code P0728 Description

The P0728 diagnostic trouble code indicates that there is an intermittent issue with the engine speed input circuit. This code is typically found in vehicles with automatic transmissions. The engine speed input circuit is responsible for sending signals to the engine control module (ECM) regarding the engine's RPM (revolutions per minute). This information is crucial for the ECM to make adjustments to fuel injection, ignition timing, and other engine functions.

OBDII Code P0728 - Engine Speed Input Circuit Intermittent
P0728 Code - Engine Speed Input Circuit Intermittent

Common Causes of P0728

  1. Faulty engine speed sensor
  2. Loose or corroded wiring connections
  3. Damaged ECM
  4. Electrical interference
  5. Poor ground connection

Symptoms of P0728

  1. Rough idling
  2. Stalling
  3. Poor acceleration
  4. Transmission shifting problems
  5. Check Engine Light illuminated

How to Fix P0728

  1. Begin by conducting a visual inspection of the wiring connections and the engine speed sensor. Look for any signs of damage, corrosion, or loose connections. Repair or replace any damaged components.
  2. Use a multimeter to test the engine speed sensor for proper operation. If the sensor is faulty, replace it with a new one.
  3. Check the ground connections for the engine speed sensor and ECM. Ensure they are clean and secure.
  4. Clear the diagnostic trouble codes from the ECM using a scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to pinpoint the exact cause of the intermittent engine speed input circuit issue.

Cost to Fix P0728

The typical repair costs for addressing a P0728 code can vary depending on the specific cause of the issue. In general, replacing a faulty engine speed sensor can cost between $100 and $200, while addressing wiring or ground connection issues may range from $50 to $150. Labor costs can add an additional $80 to $150 per hour, and the total repair bill could amount to $200 to $500 or more. It is recommended to consult with a qualified mechanic to obtain an accurate estimate based on the vehicle's make and model, as well as the extent of the repairs needed. Labor rates at auto repair shops can vary, so it's advisable to inquire about specific rates in your area.

When is the Code Detected?

The P0728 Codes is triggered when the TCM detected that the engine speed received from the ECM is intermittent.

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Code P0728 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 P0728 Code

1. What are common symptoms of OBDII code P0728 (Engine Speed Input Circuit Intermittent)?

- Common symptoms include erratic engine performance, stalling, difficulty shifting gears, and illuminated Check Engine Light.

2. What can cause the OBDII code P0728 to trigger?

- The code P0728 is typically triggered by issues with the engine speed sensor or its circuit, such as a faulty sensor, damaged wiring, or poor connections.

3. How can I diagnose the cause of OBDII code P0728?

- Diagnosing the code involves using a scan tool to check for the code, inspecting the engine speed sensor and related wiring, and testing the sensor's signal with a multimeter.

4. What are the possible repair options for OBDII code P0728?

- Repair options may include replacing the engine speed sensor, repairing damaged wiring or connections, or addressing any underlying issues causing the intermittent circuit problem.

5. Can I drive my vehicle with OBDII code P0728?

- It is not recommended to drive your vehicle with an unresolved P0728 code, as it can lead to further damage and potential safety issues due to erratic engine behavior.

6. How much does it typically cost to repair OBDII code P0728?

- The cost of repairing code P0728 can vary depending on the specific issue causing the code, but it may range from $100 to $300 for parts and labor.

7. Will resetting the Check Engine Light resolve OBDII code P0728?

- Resetting the Check Engine Light may temporarily turn it off, but the underlying issue causing code P0728 will persist and trigger the light again once the problem resurfaces.

8. How long does it take to repair OBDII code P0728?

- The repair time for code P0728 can vary based on the exact cause of the issue and the complexity of the repair, but it typically takes a few hours to complete.

9. Can a DIY enthusiast fix OBDII code P0728 at home?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P0728 at home by following repair guides and using appropriate equipment.

10. Is OBDII code P0728 a serious issue that requires immediate attention?

- While the severity of the issue may vary, it is generally recommended to address code P0728 promptly to prevent potential engine damage and ensure safe vehicle operation.

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