P0633 Ram Code - SKIM Secret Key Not Stored In PCM
Quick Answer
The P0633 diagnostic trouble code (DTC) indicates that the SKIM (Sentry Key Immobilizer Module) secret key is not stored in the Powertrain Control Module (PCM). Common causes include Malfunctioning SKIM module, Faulty transponder key, Wiring or connectivity issues between SKIM module, PCM, and transponder key. 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 Ram indicates SKIM Secret Key Not Stored In PCM.
- Common causes
- Common causes include Malfunctioning SKIM module, Faulty transponder key, Wiring or connectivity issues between SKIM module, PCM, and transponder key.
- 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 P0633 Ram Description
The P0633 diagnostic trouble code (DTC) indicates that the SKIM (Sentry Key Immobilizer Module) secret key is not stored in the Powertrain Control Module (PCM). The SKIM system is a security feature in vehicles designed to prevent unauthorized starting of the engine. The SKIM system uses a transponder key to communicate with the PCM and allow the engine to start. When the PCM does not detect the SKIM secret key, it will trigger the P0633 code.
Common Causes of P0633 Ram
- Malfunctioning SKIM module.
- Faulty transponder key.
- Wiring or connectivity issues between SKIM module, PCM, and transponder key.
- PCM software glitch or malfunction.
- Improper programming of the SKIM module or PCM.
Symptoms of P0633 Ram
- Engine cranks but does not start.
- Engine starts but immediately stalls.
- Security light on the dashboard remains illuminated.
- Vehicle anti-theft system may be triggered, preventing the engine from starting.
How to Fix P0633 Ram
- Perform a thorough inspection of the SKIM module, transponder key, and wiring connections to check for any visible damage or loose connections.
- Use a diagnostic scan tool to retrieve the SKIM secret key and program it into the PCM.
- If the SKIM module or transponder key is faulty, they may need to be replaced.
- Ensure proper programming and synchronization of the SKIM module, transponder key, and PCM.
- Clear the DTC and perform a test drive to verify that the issue has been resolved.
Cost to Fix P0633 Ram
The cost of repairing a P0633 code can vary depending on the specific cause of the issue. Replacement of the SKIM module or transponder key, if necessary, could range from $100 to $400 or more. Labor costs for diagnosis and repair can add an additional $100 to $300. Overall, the total cost for resolving a P0633 code could range from $200 to $700, but it's essential to consult with a qualified mechanic for a more accurate estimate based on the vehicle's make and model, as well as labor rates in your area.
Tech Notes for P0633 Ram
When the PIN number is not available from the vehicle owner or a Chrysler Group Scan Tool(s) is not available this can be accomplished by writing the Vehicle Identification Number (VIN) into the PCM using an after-market scan tool with a "VIN Write Function".
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Frequently Asked Questions about P0633 Ram Code
1. What does the OBDII code P0633 mean on a Ram vehicle?
The P0633 code indicates that the SKIM (Sentry Key Immobilizer Module) secret key is not stored or recognized in the Powertrain Control Module (PCM).
2. What are the common symptoms of the P0633 code?
Symptoms include the engine not starting, the immobilizer warning light illuminating, or the vehicle cranking but not starting.
3. What causes the P0633 code to appear?
Common causes include a failure to program the PCM with the SKIM secret key, a defective SKIM, a faulty PCM, or issues with related wiring or connections.
4. Can I drive my Ram with the P0633 code?
No, this code typically prevents the engine from starting, so the vehicle will not be drivable until the issue is resolved.
5. How is the P0633 code diagnosed?
Diagnosis involves using a scan tool to check for related codes, verifying the communication between the PCM and SKIM, and ensuring the PCM has been correctly programmed.
6. How do you fix the P0633 code on a Ram?
The most common fix is reprogramming the PCM with the SKIM secret key using a scan tool. If components like the SKIM or PCM are faulty, they may need replacement.
7. Does replacing the PCM automatically fix the P0633 code?
No, replacing the PCM requires reprogramming it to recognize the SKIM secret key; otherwise, the code will persist.
8. How much does it cost to fix the P0633 code?
Costs vary depending on labor rates and parts, but reprogramming the PCM typically costs $100–$300. Replacing components like the PCM or SKIM can increase costs significantly.
9. Can a dead battery cause the P0633 code?
A dead or disconnected battery alone won't cause the code, but it can lead to loss of PCM memory if the SKIM key data was not stored correctly.
10. Do I need a professional to clear the P0633 code?
Yes, resolving this code typically requires specialized tools and knowledge to reprogram the PCM and SKIM, so professional help is recommended.
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