AutoCodes – GMC – P0633 2016 GMC Sierra

P0633 2016 GMC Sierra Code - Immobilizer Key Not Programmed

Quick Answer

When learning the immobilizer data, as well as the challenge and response sequence, the Engine Control Module (ECM) is placed in learn mode. Common causes include Immobilizer Key not programmed to the vehicle, Faulty Immobilizer Key, Faulty ignition switch. 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 2016 GMC Sierra indicates Immobilizer Key Not Programmed.
Common causes: Common causes include Immobilizer Key not programmed to the vehicle, Faulty Immobilizer Key, Faulty ignition switch.
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.

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Code Popularity 286

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 16, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0633 2016 GMC Sierra Description

When learning the immobilizer data, as well as the challenge and response sequence, the Engine Control Module (ECM) is placed in learn mode. The Diagnostic Trouble Code (DTC) P0633 will be set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the immobilizer data and challenge/response are learned, learn mode will be exited when the engine is successfully started. If the ECM does not exit learn mode, the DTC P0633 will remain current and indicate a fault.

OBDII Code P0633 2016 GMC Sierra - Immobilizer Key Not Programmed - AutoCodes.com — P0633 2016 GMC Sierra Code - Immobilizer Key Not Programmed

What does this mean?

What are the Possible Causes of the DTC P0633 2016 GMC Sierra?

Immobilizer Key not programmed to the vehicle
Faulty Immobilizer Key
Faulty ignition switch

How to Fix the DTC P0633 2016 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0633 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0633 2016 GMC Sierra code?

Need more information on how to fix the P0633 2016 GMC Sierra code? Get Access to Factory Service Manuals

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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.

Frequently Asked Questions about P0633 2016 GMC Sierra Code

1. What does the OBDII code P0633 mean on a 2016 GMC Sierra?

P0633 indicates that the immobilizer key has not been programmed or the vehicle's anti-theft system cannot recognize the key.

2. What are the common symptoms of code P0633 on a 2016 GMC Sierra?

The common symptoms include the engine failing to start, the security light staying illuminated, and the vehicle being immobilized.

3. What causes the P0633 code to appear on a 2016 GMC Sierra?

The primary causes include an unprogrammed or faulty key, a malfunction in the immobilizer system, or a disrupted connection between the key and the vehicle's control module.

4. Can a dead key fob battery trigger code P0633 on a 2016 GMC Sierra?

No, a dead key fob battery typically doesnâ€™t cause this code, but it can prevent the vehicle from recognizing the key, which might mimic immobilizer issues.

5. How do I fix the P0633 code on my 2016 GMC Sierra?

The most common fix is reprogramming the key using a diagnostic tool or visiting a dealership. If the key is damaged, it may need to be replaced.

6. Can I clear code P0633 on a 2016 GMC Sierra without fixing the issue?

Clearing the code without addressing the root issue will not resolve the problem, and the code will likely return when the vehicle fails to recognize the key.

7. Do I need a professional to fix code P0633 on my 2016 GMC Sierra?

Yes, in most cases, you will need a professional with the proper diagnostic tools to reprogram the key or troubleshoot the immobilizer system.

8. Can a faulty immobilizer module cause code P0633 on a 2016 GMC Sierra?

Yes, a malfunctioning immobilizer control module or its wiring can cause the vehicle to fail to recognize the key, triggering this code.

9. How much does it cost to fix code P0633 on a 2016 GMC Sierra?

The cost varies depending on the issue. Key reprogramming typically costs $50-$150, while replacing and programming a new key or repairing the immobilizer system can cost $200 or more.

10. Can I program a new key myself to fix code P0633 on a 2016 GMC Sierra?

Programming requires a compatible diagnostic tool and specific procedures. While some vehicles allow basic programming, itâ€™s often best left to professionals or the dealership for accuracy.