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AutoCodes – Generic – P0633

P0633 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 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 1,978
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jul 16, 2022
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Code P0633 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 - Immobilizer Key Not Programmed - AutoCodes.com
P0633 Code - Immobilizer Key Not Programmed
What does this mean?

What are the Possible Causes of the DTC P0633?

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

How to Fix the DTC P0633?

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 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 code?

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

Need Help with the Code?

Get the P0633 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

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 Code

What does the OBDII code P0633 mean?

P0633 indicates that the immobilizer key has not been programmed, preventing the vehicle’s security system from recognizing the key.

What are the common symptoms of code P0633?

Symptoms include difficulty starting the engine, the immobilizer warning light staying on, and the vehicle failing to recognize the key.

What causes the P0633 code to be triggered?

It is often caused by a key that hasn’t been programmed properly, a malfunctioning immobilizer system, or a lost synchronization between the key and the vehicle’s computer.

Can I drive my car with the P0633 code active?

No, you likely won’t be able to start the car as the immobilizer system prevents unauthorized access and operation.

How do I fix code P0633?

Fixing P0633 typically requires reprogramming the key using a diagnostic tool or having a dealership or locksmith program the key for you.

Do I need to replace parts to fix P0633?

In most cases, no parts need to be replaced—just reprogramming the key or immobilizer system is sufficient.

Can a dead battery cause code P0633?

Yes, a dead or disconnected battery can cause the immobilizer system to lose synchronization, triggering this code.

How much does it cost to fix P0633?

Reprogramming the key or immobilizer may cost between $100 and $300, depending on your location and whether you visit a dealership or locksmith.

Can I program an immobilizer key myself?

Some vehicles allow DIY key programming using specific steps outlined in the owner’s manual, but many require professional tools and expertise.

Will clearing the code P0633 with a scanner fix the issue?

No, clearing the code won’t resolve the underlying problem. The key or immobilizer system must be properly reprogrammed.

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