AutoCodes – Generic – P0728

P0728 Code - Engine Speed Input Circuit Intermittent

Quick Answer

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM). Common causes include Faulty Crankshaft Position (CKP) Sensor, Crankshaft Position (CKP) Sensor harness is open or shorted, Crankshaft Position (CKP) Sensor circuit poor electrical connection. 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 Crankshaft Position (CKP) Sensor, Crankshaft Position (CKP) Sensor harness is open or shorted, Crankshaft Position (CKP) Sensor circuit poor electrical connection.
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.

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Code Popularity 12,857

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0728 Description

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

OBDII Code P0728 - Engine Speed Input Circuit Intermittent - AutoCodes.com — P0728 Code - Engine Speed Input Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0728?

Faulty Crankshaft Position (CKP) Sensor
Crankshaft Position (CKP) Sensor harness is open or shorted
Crankshaft Position (CKP) Sensor circuit poor electrical connection
Communication error between the Engine Control Module (ECM) and Transmission Control Module (TCM)

How to Fix the DTC P0728?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0728 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0728 code?

Need more information on how to fix the P0728 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0728 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0728 Mazda — Engine Speed Input Circuit Intermittent
P0728 Mercedes-Benz — Engine Speed Input Circuit Intermittent

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.