How to Fix P0633 Fault on 2004 Dodge Ram 3500 5.9L Cummins with SKIM Key Swap
I own a 2004 Dodge Ram 3500 with a 5.9L Cummins V8 engine. My truck originally did not come with optional SKIM/Sentry keys. A friend helped me swap the ignition cylinder for one that has two keys, sourced from a junkyard, and also installed the SKIM device around the cylinder, connecting it to my truck's system. After reassembly, I tried to start the vehicle — it turns over but only runs for about 1 second before stalling. The check engine light now displays DTC P0633. I've already visited one auto repair shop and one diesel specialist, and my truck is currently with a second dealership. My main question: How can I clear this fault code? Does the dealership need to perform a flash or reprogram of the ECU/PCM? This truck is essential for me as it's used to tow my fifth wheel, and I've been without it for two months — any guidance would be greatly appreciated.
The SKIM module must be paired with the specific PCM (Powertrain Control Module) from the original vehicle. To resolve this, you'll need to transfer the key programming data from the old ignition cylinder's SKIM device into your truck’s PCM. This requires a professional tool capable of extracting pin numbers from the SKIM module and programming them into the ECU. While some aftermarket tools (like those from Launch) offer this function, they can be expensive. A standalone device might be more cost-effective — I can provide the brand name if you'd like.