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P0633 2015 GMC Sierra Code - Immobilizer Key Not Programmed

Quick Answer

The P0633 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the immobilizer key is not programmed or recognized by the vehicle's anti-theft system. Common causes include Faulty key fob, Immobilizer system malfunction, Issues with the vehicle's computer 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
P0633 2015 GMC Sierra indicates Immobilizer Key Not Programmed.
Common causes
Common causes include Faulty key fob, Immobilizer system malfunction, Issues with the vehicle's computer 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 14, 2024
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Code P0633 2015 GMC Sierra Description

The P0633 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the immobilizer key is not programmed or recognized by the vehicle's anti-theft system. The immobilizer system is designed to prevent unauthorized access to the vehicle by requiring a specific key or key fob to start the engine. When the vehicle's computer detects that the key is not programmed or recognized, it will trigger the P0633 code and may prevent the engine from starting.

OBDII Code P0633 2015 GMC Sierra - Immobilizer Key Not Programmed
P0633 2015 GMC Sierra Code - Immobilizer Key Not Programmed

Common Causes of P0633 2015 GMC Sierra

  1. Faulty key fob
  2. Immobilizer system malfunction
  3. Issues with the vehicle's computer system
  4. Wiring or connection problems
  5. Dead battery in the key fob

Symptoms of P0633 2015 GMC Sierra

  1. Engine cranks but does not start
  2. Security light flashing on the dashboard
  3. Inability to start the engine
  4. Engine stalling unexpectedly
  5. Loss of power while driving

How to Fix P0633 2015 GMC Sierra

  1. Check the key fob battery: Start by replacing the battery in the key fob to ensure that it is not the cause of the issue.
  2. Reprogram the key fob: If the key fob is not the problem, the key fob may need to be reprogrammed to the vehicle's immobilizer system.
  3. Check the immobilizer system: Inspect the immobilizer system for any faults or malfunctions that may be preventing it from recognizing the key.
  4. Diagnose the vehicle's computer system: Use a diagnostic scanner to check for any error codes in the vehicle's computer system that may be related to the immobilizer key not being programmed.
  5. Seek professional help: If the issue persists after attempting these repairs, it is recommended to seek the assistance of a qualified mechanic or dealership to diagnose and repair the problem accurately.

Cost to Fix P0633 2015 GMC Sierra

The cost of repairing a P0633 code for an immobilizer key not programmed can vary depending on the specific cause of the issue. In general, the cost of replacing a key fob battery is relatively low, typically ranging from $5 to $20. However, if the issue is more complex and requires reprogramming the key fob or diagnosing the immobilizer system, the cost can range from $100 to $500 or more. It is important to note that labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0633 2015 GMC Sierra

DTC P0633 will clear upon a successful engine start. Any malfunction that will cause a no-start condition will prevent DTC P0633 from clearing. Prior to diagnosing DTC P0633, ensure that all power moving, and engine control systems are operating properly and all conditions that may cause a no-start have been corrected. Do not replace the Engine Control Module (ECM). Replacing the Engine Control Module will not correct the no-start condition.

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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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