P0633 Ram Code - SKIM Secret Key Not Stored In PCM
Quick Answer
The Diagnostic Trouble Code (DTC) will be set when the Sentry Key Immobilizer Module (SKIM) Secret Key is not programmed into the Powertrain Control Module (PCM). Common causes include Secret Key code failed to transfer to Powertrain Control Module (PCM), High or low battery voltage, No communication with Body Control Module (BCM). 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 Secret Key code failed to transfer to Powertrain Control Module (PCM), High or low battery voltage, No communication with Body Control Module (BCM).
- 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.
Code P0633 Ram Description
What are the Possible Causes of the DTC P0633 Ram?
- Secret Key code failed to transfer to Powertrain Control Module (PCM)
- High or low battery voltage
- No communication with Body Control Module (BCM)
- Faulty Powertrain Control Module
How to Fix the DTC P0633 Ram?
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.
Code Tech Notes
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".
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0633 Ram 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.
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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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