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Engine-Codes – Buick – P1579 Buick

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

Quick Answer

The P1579 Buick diagnostic trouble code (DTC) indicates a problem with the Park/Neutral (P/N) to Drive/Reverse (D/R) shift at high throttle angle, leading to the activation of Power Reduction Mode. Common causes include Faulty throttle position sensor (TPS) or accelerator pedal position sensor, Malfunctioning transmission control module (TCM) or ECM, Wiring or electrical connection issues related to the throttle or transmission 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
P1579 Buick indicates P/N to D/R at High Throttle Angle - Power Reduction Mode Active.
Common causes
Common causes include Faulty throttle position sensor (TPS) or accelerator pedal position sensor, Malfunctioning transmission control module (TCM) or ECM, Wiring or electrical connection issues related to the throttle or transmission 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 Sep 10, 2024
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Code P1579 Buick Description

The P1579 Buick diagnostic trouble code (DTC) indicates a problem with the Park/Neutral (P/N) to Drive/Reverse (D/R) shift at high throttle angle, leading to the activation of Power Reduction Mode. This code typically occurs in vehicles equipped with an electronic throttle control system. When this issue arises, the vehicle's Engine Control Module (ECM) detects that the transmission is not shifting properly when the throttle angle is high, which can potentially compromise the vehicle's performance and safety.

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

Common Causes of P1579 Buick

  1. Faulty throttle position sensor (TPS) or accelerator pedal position sensor.
  2. Malfunctioning transmission control module (TCM) or ECM.
  3. Wiring or electrical connection issues related to the throttle or transmission system.
  4. Mechanical problems within the transmission, such as worn components or internal damage.
  5. Software glitches or calibration errors in the electronic control units.

Symptoms of P1579 Buick

  1. Reduced acceleration or loss of power during high throttle operation.
  2. Difficulty shifting gears or erratic transmission behavior.
  3. Illumination of the check engine light on the instrument panel.
  4. Increased fuel consumption or decreased fuel efficiency.
  5. Harsh or delayed transmission engagement.

How to Fix P1579 Buick

  1. Diagnose the P1579 code using a diagnostic scan tool to retrieve specific fault codes and data related to the transmission and throttle systems.
  2. Inspect and test the throttle position sensor and accelerator pedal position sensor for proper operation and signal output.
  3. Check the transmission control module and ECM for any software updates or reprogramming that may address the shift control issue.
  4. Perform a thorough visual inspection of the wiring harnesses and connectors associated with the throttle and transmission systems to identify any damaged or corroded components.
  5. If necessary, replace faulty sensors, repair damaged wiring, or recalibrate the electronic control units to resolve the P/N to D/R shift problem and deactivate Power Reduction Mode.

Cost to Fix P1579 Buick

The cost estimate for repairing the P1579 Buick code can vary depending on the specific cause of the issue and the extent of repairs needed. In general, the parts required for this repair, such as sensors or wiring components, may range from $100 to $300. Additionally, labor costs can add another $100 to $300 to the total repair bill. Overall, the total cost for addressing the P/N to D/R shift problem and deactivating Power Reduction Mode could range from $200 to $600, excluding any diagnostic fees or additional services.

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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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