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Engine-Codes – GMC – P1579 GMC

P1579 GMC Code - P/N to D/R at High Throttle Angle - Power Reduction Mode Active

Quick Answer

The P1579 GMC diagnostic trouble code indicates that there is an issue with the shift from Park/Neutral (P/N) to Drive/Reverse (D/R) at high throttle angles, resulting in the activation of Power Reduction Mode. Common causes include Faulty throttle position sensor, Wiring or connector issues in the throttle position sensor circuit, ECM software glitches or malfunctions. 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
P1579 GMC indicates P/N to D/R at High Throttle Angle - Power Reduction Mode Active.
Common causes
Common causes include Faulty throttle position sensor, Wiring or connector issues in the throttle position sensor circuit, ECM software glitches or malfunctions.
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 Sep 10, 2024
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Code P1579 GMC Description

The P1579 GMC diagnostic trouble code indicates that there is an issue with the shift from Park/Neutral (P/N) to Drive/Reverse (D/R) at high throttle angles, resulting in the activation of Power Reduction Mode. When this code is triggered, the vehicle's Engine Control Module (ECM) detects a discrepancy in the throttle position sensor readings during the transition between gears, causing the ECM to limit engine power to prevent potential damage. This code typically affects vehicles equipped with an electronically controlled transmission system.

OBDII Code P1579 GMC - P/N to D/R at High Throttle Angle - Power Reduction Mode Active
P1579 GMC Code - P/N to D/R at High Throttle Angle - Power Reduction Mode Active

Common Causes of P1579 GMC

  1. Faulty throttle position sensor
  2. Wiring or connector issues in the throttle position sensor circuit
  3. ECM software glitches or malfunctions
  4. Transmission control module failure
  5. Mechanical issues in the transmission system

Symptoms of P1579 GMC

  1. Engine power reduction during gear shifts
  2. Delayed or harsh shifting between gears
  3. Illumination of the Check Engine Light
  4. Limited acceleration or loss of power
  5. Transmission slipping or jerking

How to Fix P1579 GMC

  1. Begin by connecting a diagnostic scanner to retrieve the specific trouble code and identify the root cause of the issue.
  2. Inspect the throttle position sensor and its wiring for any signs of damage, corrosion, or loose connections. Replace or repair as necessary.
  3. Test the transmission control module for proper functionality and reprogram if needed to address any software glitches.
  4. Perform a comprehensive transmission system check to ensure all components are functioning correctly and repair or replace any faulty parts.
  5. Clear the trouble code from the ECM's memory and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1579 GMC

The cost of repairing the P1579 GMC code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair costs for this type of problem can range from $200 to $600, including parts and labor. It's important to keep in mind that these are rough estimates, and actual costs may differ based on the complexity of the repair and the components that need to be replaced. Additionally, diagnostic time and labor rates at auto repair shops can impact the overall cost, so it's advisable to obtain quotes from multiple sources before proceeding with the 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.

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