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P174E Chevrolet Code - Output Shaft Speed / ABS Wheel Speed Correlation

Quick Answer

The P174E code indicates a correlation issue between the output shaft speed sensor and the ABS wheel speed sensor in Chevrolet vehicles. Common causes include Faulty output shaft speed sensor failing to provide accurate readings, Malfunctioning ABS wheel speed sensor affecting the correlation, Damaged or corroded wiring and connectors between the sensors and the 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
P174E Chevrolet indicates Output Shaft Speed / ABS Wheel Speed Correlation.
Common causes
Common causes include Faulty output shaft speed sensor failing to provide accurate readings, Malfunctioning ABS wheel speed sensor affecting the correlation, Damaged or corroded wiring and connectors between the sensors and the 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 Oct 17, 2024
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Code P174E Chevrolet Description

The P174E code indicates a correlation issue between the output shaft speed sensor and the ABS wheel speed sensor in Chevrolet vehicles. This code typically arises when the Engine Control Module (ECM) detects a discrepancy between the speeds reported by these two sensors. The output shaft speed sensor monitors the rotational speed of the transmission output shaft, while the ABS wheel speed sensor measures the speed of the wheels. Both sensors play critical roles in the vehicle's performance, particularly in systems like traction control and anti-lock braking.

OBDII Code P174E Chevrolet - Output Shaft Speed / ABS Wheel Speed Correlation
P174E Chevrolet Code - Output Shaft Speed / ABS Wheel Speed Correlation

Common Causes of P174E Chevrolet

  1. Faulty output shaft speed sensor failing to provide accurate readings.
  2. Malfunctioning ABS wheel speed sensor affecting the correlation.
  3. Damaged or corroded wiring and connectors between the sensors and the ECM.
  4. Issues within the transmission, such as low fluid levels or internal wear.
  5. Software glitches or calibration issues within the ECM that misinterpret sensor data.

Symptoms of P174E Chevrolet

  1. Erratic or harsh shifting of the transmission.
  2. Illuminated check engine light or ABS warning light on the dashboard.
  3. Decreased fuel efficiency due to improper transmission operation.
  4. Unresponsive traction control system, leading to potential loss of vehicle stability.
  5. Increased engine RPMs without corresponding acceleration, indicating slipping or miscommunication between systems.

How to Fix P174E Chevrolet

  1. Diagnostic Testing: Begin by using an OBD-II scanner to confirm the P174E code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Conduct a thorough visual inspection of the wiring and connectors associated with both the output shaft speed sensor and the ABS wheel speed sensor for signs of damage, corrosion, or loose connections.
  3. Sensor Replacement: If either the output shaft speed sensor or the ABS wheel speed sensor is found to be faulty, replace the affected sensor with a new, OEM-quality part.
  4. Wiring Repair: If damaged wiring is discovered, repair or replace the wiring and connectors to ensure proper signal transmission between the sensors and the ECM.
  5. ECM Reprogramming: If the issue persists after replacing the sensors and repairing the wiring, consider reprogramming or updating the ECM software to ensure it correctly interprets the sensor data.

Cost to Fix P174E Chevrolet

The cost to diagnose and repair the P174E code can vary significantly based on several factors, including the specific vehicle make and model, the location of the repair shop, and the complexity of the issue. Typically, the cost for parts and labor can range from $200 to $800. For example, a new speed sensor may cost between $50 and $150, while labor rates can range from $80 to $150 per hour. In metropolitan areas or at dealerships, labor rates may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate, as the total cost will depend on the time required for diagnosis and repair.

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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 P174E Chevrolet Code

1. What are the common symptoms of OBDII code P174E in a Chevrolet vehicle?

- Common symptoms include erratic vehicle speed readings, ABS system malfunctions, and illuminated warning lights on the dashboard.

2. What does the OBDII code P174E indicate in a Chevrolet vehicle?

- This code indicates a correlation issue between the output shaft speed sensor and the ABS wheel speed sensors.

3. What are the possible causes of OBDII code P174E in a Chevrolet?

- Possible causes include a faulty output shaft speed sensor, damaged ABS wheel speed sensors, wiring issues, or a malfunctioning ABS module.

4. How can I diagnose OBDII code P174E in my Chevrolet?

- Diagnosis involves using a scan tool to retrieve the code, checking the output shaft speed sensor and ABS wheel speed sensor readings, and inspecting the wiring for any damage or corrosion.

5. Can I drive my Chevrolet with OBDII code P174E?

- It is not recommended to drive the vehicle with this code present, as it can affect the accuracy of speed readings and the proper functioning of the ABS system.

6. How can I repair OBDII code P174E in my Chevrolet?

- Repair may involve replacing the faulty output shaft speed sensor, repairing or replacing damaged wiring, or addressing any issues with the ABS wheel speed sensors or module.

7. Will resetting the OBDII code P174E in my Chevrolet make it go away permanently?

- Resetting the code may temporarily clear the warning lights, but if the underlying issue is not addressed, the code is likely to return.

8. How much does it typically cost to repair OBDII code P174E in a Chevrolet?

- The cost of repair can vary depending on the specific issue, but it may range from $200 to $500 or more, including parts and labor.

9. Can I prevent OBDII code P174E from occurring in my Chevrolet?

- Regular maintenance, such as checking and replacing sensors as needed, inspecting wiring for damage, and addressing any ABS system issues promptly, can help prevent this code from appearing.

10. Is it necessary to take my Chevrolet to a dealership for OBDII code P174E diagnosis and repair?

- While a dealership may have specialized knowledge and tools, an experienced independent mechanic can also diagnose and repair this code effectively.

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