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P158A 2015 GMC Sierra Code - Cruise Control Calibration Incorrect

Quick Answer

The P158A diagnostic trouble code (DTC) indicates that the cruise control system in a 2015 GMC Sierra has detected a calibration issue. Common causes include Faulty throttle position sensor sending incorrect data to the PCM, Malfunctioning vehicle speed sensor affecting speed readings, Wiring issues, such as damaged or corroded connectors in the cruise control circuit. 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
P158A 2015 GMC Sierra indicates Cruise Control Calibration Incorrect.
Common causes
Common causes include Faulty throttle position sensor sending incorrect data to the PCM, Malfunctioning vehicle speed sensor affecting speed readings, Wiring issues, such as damaged or corroded connectors in the cruise control circuit.
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 P158A 2015 GMC Sierra Description

The P158A diagnostic trouble code (DTC) indicates that the cruise control system in a 2015 GMC Sierra has detected a calibration issue. This code is triggered when the powertrain control module (PCM) identifies that the cruise control system is not functioning within its specified parameters. The cruise control system relies on various sensors, including the throttle position sensor, vehicle speed sensor, and brake pedal position sensor, to maintain a steady speed. When these components are not calibrated correctly, the system may not engage or disengage as intended, leading to erratic behavior.

OBDII Code P158A 2015 GMC Sierra - Cruise Control Calibration Incorrect
P158A 2015 GMC Sierra Code - Cruise Control Calibration Incorrect

Common Causes of P158A 2015 GMC Sierra

  1. Faulty throttle position sensor sending incorrect data to the PCM.
  2. Malfunctioning vehicle speed sensor affecting speed readings.
  3. Wiring issues, such as damaged or corroded connectors in the cruise control circuit.
  4. Software glitches or outdated programming in the PCM.
  5. Brake pedal position sensor malfunction, causing the system to believe the brakes are engaged.

Symptoms of P158A 2015 GMC Sierra

  1. Cruise control system fails to engage or disengage.
  2. Erratic acceleration or deceleration while cruise control is activated.
  3. Warning lights illuminated on the dashboard, such as the cruise control indicator or check engine light.
  4. Inconsistent vehicle speed while cruise control is active.
  5. Unusual throttle response when attempting to use cruise control.

How to Fix P158A 2015 GMC Sierra

  1. Diagnostic Scan: Begin by using an OBD-II scanner to confirm the P158A code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Inspect the wiring and connectors associated with the cruise control system for signs of damage, corrosion, or loose connections.
  3. Sensor Testing: Test the throttle position sensor and vehicle speed sensor for proper operation using a multimeter or scan tool to ensure they are providing accurate readings to the PCM.
  4. Recalibration: If sensors are functioning correctly, recalibrate the cruise control system using a specialized scan tool or software as per manufacturer specifications.
  5. PCM Update: If the issue persists, consider updating or reprogramming the PCM to ensure it has the latest software and calibration settings.

Cost to Fix P158A 2015 GMC Sierra

The typical repair costs for addressing a P158A code can range from $150 to $600, depending on the specific cause of the issue. This estimate includes parts and labor, with labor costs typically ranging from $80 to $150 per hour. Factors such as location, the complexity of the repair, and whether the work is performed at a dealership or an independent shop can significantly influence the final cost. For instance, metropolitan areas may see higher labor rates, while independent shops often offer more competitive pricing. It is advisable to obtain quotes from local repair shops to get a more precise estimate tailored to your specific situation.

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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 P158A 2015 GMC Sierra Code

1. What does the OBDII code P158A mean on a 2015 GMC Sierra?

P158A indicates that the cruise control calibration is incorrect, suggesting a mismatch or issue with the cruise control system's programming or calibration.

2. What are the common symptoms of code P158A in a 2015 GMC Sierra?

Symptoms may include the cruise control not engaging, disengaging unexpectedly, or not functioning as intended.

3. What causes the P158A code in a 2015 GMC Sierra?

Common causes include incorrect programming of the cruise control module, a failed calibration, or issues with related sensors and modules.

4. Can I still drive my 2015 GMC Sierra with code P158A?

Yes, you can usually drive the vehicle, but the cruise control system may not work properly, and it’s best to address the issue promptly.

5. How do I fix the P158A code on my 2015 GMC Sierra?

Fixes may include reprogramming or recalibrating the cruise control module, updating the vehicle's software, or diagnosing and replacing any faulty sensors.

6. Will clearing the P158A code solve the problem on a 2015 GMC Sierra?

Clearing the code may temporarily remove it, but if the underlying issue is not fixed, the code will likely return.

7. How is the P158A code diagnosed?

A technician will use a scan tool to check for related codes, verify the cruise control operation, and ensure the system's calibration matches factory specifications.

8. What tools are needed to fix the P158A code on a 2015 GMC Sierra?

You may need a professional-grade diagnostic scan tool capable of reprogramming or calibrating the cruise control system.

9. Could a faulty sensor cause the P158A code on a 2015 GMC Sierra?

Yes, a malfunctioning sensor, such as the brake pedal position sensor or throttle position sensor, could contribute to cruise control calibration errors.

10. Is the P158A code covered under warranty for a 2015 GMC Sierra?

It depends on your vehicle’s warranty terms. If the issue is related to a manufacturer defect, it might be covered. Check with your dealership for details.

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