Engine-Codes.com
Engine-Codes – GMC – P158A 2017 GMC Sierra

P158A 2017 GMC Sierra Code - Cruise Control Calibration Incorrect

Quick Answer

The P158A diagnostic trouble code (DTC) indicates that there is an issue with the cruise control system calibration in a 2017 GMC Sierra. Common causes include Faulty throttle position sensor (TPS) that provides incorrect readings to the ECM, Malfunctioning cruise control module or actuator, Damaged wiring or poor connections within the cruise control system. 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 2017 GMC Sierra indicates Cruise Control Calibration Incorrect.
Common causes
Common causes include Faulty throttle position sensor (TPS) that provides incorrect readings to the ECM, Malfunctioning cruise control module or actuator, Damaged wiring or poor connections within the cruise control system.
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 26, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P158A 2017 GMC Sierra Description

The P158A diagnostic trouble code (DTC) indicates that there is an issue with the cruise control system calibration in a 2017 GMC Sierra. This code is triggered when the Engine Control Module (ECM) detects that the cruise control system is not functioning within its expected parameters. The cruise control system relies on various sensors and modules to maintain the desired speed of the vehicle, and any discrepancies in these components can lead to improper calibration.

OBDII Code P158A 2017 GMC Sierra - Cruise Control Calibration Incorrect
P158A 2017 GMC Sierra Code - Cruise Control Calibration Incorrect

Common Causes of P158A 2017 GMC Sierra

  1. Faulty throttle position sensor (TPS) that provides incorrect readings to the ECM.
  2. Malfunctioning cruise control module or actuator.
  3. Damaged wiring or poor connections within the cruise control system.
  4. Software issues or calibration errors in the ECM.
  5. Vacuum leaks or issues in the throttle body that can affect engine performance.

Symptoms of P158A 2017 GMC Sierra

  1. Inability to engage cruise control.
  2. Erratic speed fluctuations while cruise control is active.
  3. Warning lights illuminated on the dashboard, specifically related to cruise control or engine performance.
  4. Increased engine RPMs without corresponding acceleration when cruise control is engaged.
  5. Unresponsive throttle when attempting to disengage cruise control.

How to Fix P158A 2017 GMC Sierra

  1. Diagnostic Scan: Start with a comprehensive diagnostic scan to confirm the P158A code and check for any related codes that may provide additional context.
  2. Visual Inspection: Conduct a thorough visual inspection of the cruise control system components, including wiring, connectors, and the throttle position sensor, looking for signs of damage or wear.
  3. Sensor Testing: Test the throttle position sensor and other relevant sensors to ensure they are functioning correctly and providing accurate readings to the ECM.
  4. Module Reprogramming: If the cruise control module or ECM is found to be faulty or improperly calibrated, reprogramming or replacing the module may be necessary.
  5. Road Test: After repairs, perform a road test to ensure that the cruise control system is functioning properly and that the P158A code does not return.

Cost to Fix P158A 2017 GMC Sierra

The typical repair costs for addressing a P158A code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $150 and $600. This estimate includes parts such as sensors or modules, which can range from $50 to $300, and labor costs that usually fall between $80 and $150 per hour. Keep in mind that labor rates can vary significantly based on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer more competitive pricing. For a precise estimate, it's advisable to check local rates and consult with a trusted mechanic.

Need more information about the P158A 2017 GMC Sierra code?

Need more information on how to fix the P158A 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P158A 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

1. What does the OBDII code P158A mean on a 2017 GMC Sierra?

P158A indicates that the Cruise Control Calibration is incorrect, often caused by incorrect module programming or software issues.

2. What are the symptoms of code P158A on a 2017 GMC Sierra?

Symptoms may include the cruise control not functioning properly, a malfunction indicator light (MIL) on the dashboard, or limited vehicle speed control.

3. What causes the P158A code to trigger on a GMC Sierra?

Common causes include incorrect calibration of the cruise control module, faulty software updates, or a misaligned throttle position sensor.

4. Can I still drive my 2017 GMC Sierra with the P158A code?

Yes, you can drive the vehicle, but cruise control functionality may be impaired, and it’s recommended to address the issue to avoid further complications.

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

The fix typically involves reprogramming or recalibrating the cruise control system using a diagnostic scan tool at a dealership or qualified repair shop.

6. Is P158A a serious problem for my GMC Sierra?

While it’s not critical for basic vehicle operation, it can affect your ability to use cruise control and could indicate a potential software or calibration issue that needs attention.

7. Can a software update resolve the P158A code on my 2017 GMC Sierra?

Yes, a software update or recalibration of the cruise control module using GM's official programming tools can often resolve the issue.

8. What tools are needed to diagnose and repair the P158A code?

A professional OBDII scan tool with GM-specific capabilities is required to diagnose and recalibrate the cruise control system.

9. Could a faulty throttle position sensor cause the P158A code?

Yes, a misaligned or malfunctioning throttle position sensor can contribute to this code, as it affects cruise control calibration.

10. How much does it cost to fix the P158A code on a 2017 GMC Sierra?

The cost can vary, but recalibration or reprogramming at a dealership typically ranges from $100 to $250, depending on labor rates and diagnostic time.

Discuss the causes and fixes for P158A 2017 GMC Sierra OBDII Code

Submit a New Comment

Code P158A 2017 GMC Sierra comments

No comments found for this page.