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Engine-Codes – GMC – P174E GMC

P174E GMC 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 GMC vehicles. Common causes include Faulty output shaft speed sensor or ABS wheel speed sensors, Damaged or corroded wiring and connectors related to the sensors, Low or contaminated transmission fluid affecting sensor readings. 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 GMC indicates Output Shaft Speed / ABS Wheel Speed Correlation.
Common causes
Common causes include Faulty output shaft speed sensor or ABS wheel speed sensors, Damaged or corroded wiring and connectors related to the sensors, Low or contaminated transmission fluid affecting sensor readings.
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 19, 2024
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Code P174E GMC Description

The P174E code indicates a correlation issue between the output shaft speed sensor and the ABS wheel speed sensor in GMC 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 measures the rotational speed of the transmission output shaft, while the ABS wheel speed sensors monitor the speed of each wheel. Both sensors play crucial roles in the vehicle's performance, particularly in systems like traction control, stability control, and anti-lock braking systems (ABS).

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

Common Causes of P174E GMC

  1. Faulty output shaft speed sensor or ABS wheel speed sensors.
  2. Damaged or corroded wiring and connectors related to the sensors.
  3. Low or contaminated transmission fluid affecting sensor readings.
  4. Internal transmission issues, such as worn components or mechanical failure.
  5. Software glitches or calibration issues within the ECM.

Symptoms of P174E GMC

  1. Erratic or harsh shifting of the transmission.
  2. Illuminated check engine light on the dashboard.
  3. Reduced acceleration or sluggish performance.
  4. ABS warning light activation or malfunctioning ABS system.
  5. Unusual noises from the transmission during operation.

How to Fix P174E GMC

  1. Diagnostic Scan: Begin with a comprehensive diagnostic scan 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 the output shaft speed sensor and ABS wheel speed sensors for signs of damage or corrosion.
  3. Sensor Testing: Test the output shaft speed sensor and ABS wheel speed sensors using a multimeter to ensure they are functioning correctly and providing accurate readings.
  4. Fluid Check: Inspect the transmission fluid for proper levels and condition. If the fluid is low or contaminated, perform a fluid change and replace the filter if necessary.
  5. ECM Reprogramming: If all hardware components are functioning correctly, consider reprogramming or updating the ECM to ensure it can accurately interpret the signals from the sensors.

Cost to Fix P174E GMC

The cost to diagnose and repair the P174E code can vary significantly based on the specific issue identified. On average, the total repair costs can range from $150 to $600. This estimate includes parts such as sensors, wiring, and transmission fluid, as well as labor costs. Labor rates typically range from $80 to $150 per hour, depending on the location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It is advisable to check local auto repair shops for a more precise estimate based on your specific circumstances.

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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 GMC Code

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

The common symptoms of OBDII code P174E include issues with the vehicle's transmission shifting, the ABS system, and the speedometer not functioning properly.

2. What are the possible causes of OBDII code P174E in a GMC vehicle?

Possible causes of OBDII code P174E include a faulty output shaft speed sensor, a malfunctioning ABS wheel speed sensor, wiring issues, or a problem with the vehicle's control module.

3. How can I diagnose OBDII code P174E in my GMC vehicle?

Diagnosing OBDII code P174E involves using a scan tool to retrieve the fault code, checking the output shaft speed sensor, inspecting the ABS wheel speed sensors, and ensuring there are no wiring issues.

4. Can I continue driving my GMC vehicle with OBDII code P174E?

It is not recommended to continue driving your GMC vehicle with OBDII code P174E as it can lead to further damage to the transmission or ABS system. It's best to address the issue promptly.

5. How can I repair OBDII code P174E in my GMC vehicle?

Repairing OBDII code P174E may involve replacing the faulty output shaft speed sensor, addressing any issues with the ABS wheel speed sensors, repairing damaged wiring, or reprogramming the vehicle's control module.

6. Will resetting the OBDII code P174E in my GMC vehicle make it go away permanently?

Resetting the OBDII code P174E may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and repair the root cause of the problem.

7. Is OBDII code P174E in a GMC vehicle a serious issue?

OBDII code P174E in a GMC vehicle should be taken seriously as it can impact the vehicle's transmission and ABS system operation. Ignoring the code can lead to drivability issues and potential safety concerns.

8. Can a DIY enthusiast easily fix OBDII code P174E in a GMC vehicle?

Depending on their skill level and access to tools, a DIY enthusiast may be able to address OBDII code P174E by replacing sensors, checking wiring, and resetting the code. However, more complex issues may require professional help.

9. How long does it typically take to repair OBDII code P174E in a GMC vehicle?

The time to repair OBDII code P174E in a GMC vehicle can vary based on the specific cause of the issue. Simple fixes like sensor replacement may take a few hours, while more complex issues could take longer.

10. Will fixing OBDII code P174E improve my GMC vehicle's performance?

Addressing OBDII code P174E in a GMC vehicle can improve performance by restoring proper transmission shifting and ABS system function. It can also prevent further damage and ensure the vehicle operates safely.

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