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Engine-Codes – GMC – P1511 GMC

P1511 GMC Code - Throttle Control System Backup System Performance

Quick Answer

The P1511 diagnostic trouble code for GMC vehicles refers to the Throttle Control System Backup System Performance. Common causes include Faulty throttle position sensor, Malfunctioning throttle body, Vacuum leaks. 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
P1511 GMC indicates Throttle Control System Backup System Performance.
Common causes
Common causes include Faulty throttle position sensor, Malfunctioning throttle body, Vacuum leaks.
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 P1511 GMC Description

The P1511 diagnostic trouble code for GMC vehicles refers to the Throttle Control System Backup System Performance. This code typically indicates an issue with the backup system that is responsible for controlling the throttle on the vehicle. The throttle control system is crucial for regulating the amount of air entering the engine, which in turn affects the vehicle's speed and performance.

OBDII Code P1511 GMC - Throttle Control System Backup System Performance
P1511 GMC Code - Throttle Control System Backup System Performance

Common Causes of P1511 GMC

  1. Faulty throttle position sensor
  2. Malfunctioning throttle body
  3. Vacuum leaks
  4. Wiring or connector issues in the throttle control system

Symptoms of P1511 GMC

  1. Poor acceleration
  2. Rough idling
  3. Stalling
  4. Reduced power/lack of response to throttle input

How to Fix P1511 GMC

  1. Diagnose the issue using a scan tool to pinpoint the exact cause of the problem.
  2. Inspect the throttle position sensor and throttle body for any signs of damage or malfunction.
  3. Check for vacuum leaks in the system and repair as necessary.
  4. Inspect the wiring and connectors in the throttle control system for any loose connections or damage.
  5. Clear the code from the vehicle's computer and test drive to ensure the issue has been resolved.

Cost to Fix P1511 GMC

The typical repair costs for addressing a P1511 diagnostic trouble code can vary depending on the specific cause of the issue. On average, you can expect to pay anywhere from $200 to $500 for parts and labor. However, it's important to note that the actual cost may be higher or lower based on factors such as location, vehicle make and model, and the extent of the repairs needed. Diagnostic time and labor rates at auto repair shops can vary, so it's best to check with local shops for a more accurate estimate.

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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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