Chrysler SKIM / Sentry Key Delete Guide (2026 Mail-In)

Who this is for

This guide is for the builder, repair shop or owner who hit a no-start that traces back to the immobilizer rather than the engine. If you swapped a powertrain, dropped in a salvage-yard PCM, lost the only key, or removed a damaged immobilizer module and now the engine fires for half a second and dies, you are dealing with a Sentry Key Immobilizer System handshake that no longer completes. Auto Module Lab disables that handshake inside the engine controller so the vehicle starts and runs regardless of whether a chipped key is present.

It applies to Chrysler, Dodge and Jeep vehicles from roughly 1998 through 2010 running SBEC3, JTEC or NGC engine controllers. We are a nationwide mail-in shop in Arlington, Texas, so it does not matter where your project lives; the controller comes to the bench, the delete is done, and it goes back.

What SKIM, SKREEM and WIN actually are

Chrysler's anti-theft electronics carry several names depending on the year and platform, and they trip people up constantly.

• SKIM stands for Sentry Key Immobilizer Module, the early standalone immobilizer.
• SKREEM stands for Sentry Key Remote Entry Module, a later combined immobilizer and remote-keyless-entry unit.
• WIN stands for Wireless Ignition Node, the push-button-era successor that integrates the ignition and immobilizer.

All three do the same core job: they hold the secret immobilizer key, read the transponder chip in your physical key through an antenna ring around the ignition, and tell the PCM whether to allow the engine to keep running. Chrysler introduced the Sentry Key system to meet the same anti-theft goals that drove the wider industry; passive immobilizers became near-universal because they work, and motor vehicle theft remains common enough that the Insurance Information Institute tracks it as a multi-billion-dollar annual loss. The handshake is the security feature. When the handshake is the thing standing between you and a running engine you legitimately own, deleting it inside the PCM is the clean fix.

The controllers we delete on

Controller	Rough era	Typical vehicles	Notes
SBEC3	1998-2004	Ram, Dakota, Durango, Grand Cherokee, Wrangler TJ	Single-board engine controller
JTEC / JTEC+	1999-2004	Grand Cherokee, Wrangler, Ram	Jeep Truck Engine Controller
NGC (Next Generation Controller)	2004-2010	300, Charger, Magnum, Caliber, Compass, Patriot, Ram	Broad Chrysler-wide platform

These are the workhorse Chrysler controllers of the era and all of them participate in the Sentry Key handshake. The exact part number and software level determine the approach, and we confirm that on the bench.

How the handshake works, in plain terms

Every time you turn the key or press start, the immobilizer module reads the transponder in your key, compares it to a stored secret, and sends a coded "engine OK to run" message to the PCM over the bus. The PCM, in turn, has its own stored secret key that must match. If the PCM does not receive a valid go-ahead, it kills fuel and spark within a second or two. That is why a SKIM problem shows up as start-and-stall, not crank-no-start: the engine briefly runs on the initial injection event and then the PCM cuts it.

This is the same logical model the industry uses for immobilizers, and it is described in the broader vehicle security and immobilizer literature that SAE and others have published. The system is robust precisely because the secret never leaves the modules. When you change one half of the pair, by swapping the PCM or removing the immobilizer, the secrets no longer match and the engine will not stay running.

Deleting the SKIM function inside the PCM removes the requirement for that go-ahead message. The PCM stops waiting for the immobilizer's approval and simply runs the engine. The result is a controller that starts with a chipped key, a plain mechanical key, or no transponder at all.

"If you get a Chrysler that fires for a second and then dies, stop chasing fuel pumps and crank sensors. That start-and-stall with the security light is the SKIM handshake cutting the engine, every time. On a swap or a no-key salvage PCM there is nothing to re-pair to, and deleting the handshake in the controller is the only clean way through."

— Master automotive locksmith, 15+ years on Chrysler immobilizer systems (anonymized)

Failure modes and symptoms you will recognize

The Sentry Key system announces itself in fairly consistent ways.

• Starts and immediately stalls. The single most common symptom. Engine fires, runs for one to two seconds, then dies.
• Security or theft light flashing. A blinking immobilizer lamp on the dash signals a failed key recognition or a module mismatch.
• No-start after a PCM swap. You installed a used or rebuilt controller and now the engine will not stay running.
• No-start after losing all keys. No valid transponder means the immobilizer never approves the start.
• Diagnostic trouble codes in the immobilizer family. Codes such as P0633 (SKIM secret key not stored in the PCM) and P1693 (a companion DTC reported by the partner module) point directly at a broken handshake. Chrysler's own service material and independent references like the Ross-Tech and broader OBD-II code communities document these immobilizer codes for diagnosis.

If you are seeing start-and-stall plus a security light, especially after a swap, the immobilizer is the suspect.

The exact mail-in process

We kept the workflow simple and predictable.

1. Order online. Choose the Chrysler SKIM / Sentry Key delete at 250 dollars and pay. You receive a confirmation and a packing slip.
2. Remove the PCM and ship it. Disconnect the battery, unplug the engine controller, remove it, and mail it to: Auto Module Lab, 1168 W Pioneer Parkway, Arlington TX 76013. Write your order number on the packing slip and include it.
3. 24-hour bench turnaround. Once the controller arrives, we disable the immobilizer handshake on the bench within one business day and verify the result before it ships back.
4. Flat-rate return shipping. We send the controller back via the return tier you chose at checkout (from 14.95 dollars). You reinstall it, and the engine starts and runs without waiting on the immobilizer.

Pay, pick a flat-rate return tier, ship, 24-hour bench work. No tow, no dealer key-coding appointment, no dealer programming fees.

What to ship

For the SKIM delete we need the engine controller only.

• The PCM/ECM, removed from its bracket if it lifts off easily.
• The packing slip with your order number.
• Firm padding so the connector pins cannot move in transit.
• A rigid box rather than a padded envelope, because the exposed connector pins bend easily.

You do not need to send keys, the immobilizer module, the BCM or any paperwork. The whole point of the delete is that the engine no longer depends on those parts, so they stay with your vehicle.

What this service does NOT fix

This is where being specific saves you a wasted shipment.

• It is not a key-programming service. We are removing the need for the immobilizer, not adding a new key to a working system. If your immobilizer is healthy and you simply want another working key cut and coded, that is a different job.
• It is not a fix for a mechanical no-crank. A dead starter, a bad ignition switch, a fuel-delivery fault or a no-spark condition is not an immobilizer problem and the delete will not address it.
• It is not an emissions defeat. We do not delete catalytic converters, disable EVAP, defeat EGR, or remove any federally required emissions control. Tampering with emissions equipment is enforced by the EPA under the Clean Air Act and we do not provide it.
• It does not change your VIN. The VIN stored in the controller is left alone. A SKIM delete and a VIN change are not the same thing, and we do not alter VINs.
• It is not a cure for a damaged PCM. A controller with water intrusion, a blown driver, or a dead processor is a hardware failure. Deleting the immobilizer will not revive dead hardware.

If your situation is actually one of these, tell us before you ship and we will steer you to the right path.

Why a delete instead of re-coding the immobilizer

For a normal car with a healthy immobilizer and a present key, re-coding is the textbook answer. The delete is the better answer in three specific situations, and those are the ones this service exists for.

• Engine swaps. When the PCM came from a different vehicle, its immobilizer secret will never match your car's module. Re-pairing across mismatched platforms is often impractical; deleting the requirement is clean and permanent.
• No-key salvage controllers. A controller bought from a salvage yard with no keys and no documentation cannot be paired in the normal way. Deleting the handshake lets it run.
• Missing or removed SKIM modules. If the immobilizer module is gone, damaged, or intentionally removed from a stripped or repurposed chassis, the PCM has nothing to handshake with. The delete removes the dependency entirely.

In each case the goal is the same: a controller that runs the engine for a legitimate repair, swap, or off-road build without depending on an immobilizer that no longer fits the situation.

Price versus the dealer and the alternatives

The dealer does not offer a SKIM delete, because the dealer's job is to keep the immobilizer intact and re-key the vehicle. The realistic comparison is between a bench delete, a dealer re-key, and chasing the problem with mismatched used parts.

Path	Typical cost	Turnaround	Notes
Auto Module Lab SKIM delete	250 dollars	24-hour bench + shipping	Flat-rate return shipping from 14.95 dollars, starts with chipped or plain key
Dealer all-keys-lost re-key	300-600+ dollars plus tow	Days, by appointment	Requires a working immobilizer pairing; not viable for swaps
Mismatched used PCM trial-and-error	Variable, often hundreds	Open-ended	Wrong immobilizer secret, repeated no-starts
Locksmith re-pair (healthy system)	75-250 dollars	Same day if mobile	Only works when the immobilizer and a key are intact

The dealer route assumes a working immobilizer and at least one valid key to pair against. In a swap or a no-key salvage scenario, that assumption does not hold, which is precisely why the delete is the efficient answer. It is also worth noting that immobilizer technology measurably reduced theft of the vehicles that adopted it; long-running analysis such as the research summarized by the National Institute of Justice on electronic immobilizers shows the systems work as designed, which is exactly why they are stubborn to defeat through ordinary parts-swapping and why a clean bench delete is the right tool for a legitimate repair.

Frequently asked questions

Will the engine start with any key after the delete?

Yes. Once the immobilizer handshake is disabled in the PCM, the engine starts with a chipped key, a plain mechanical key, or no transponder at all. The PCM no longer waits for an immobilizer go-ahead.

Do I have to send my keys or the SKIM module?

No. We only need the engine controller. Keys and the immobilizer module stay with your vehicle, and after the delete the engine does not depend on them.

I have P0633 and P1693. Does that confirm a SKIM issue?

Those codes are strongly associated with the immobilizer handshake. P0633 indicates the SKIM secret key is not stored in the PCM, and P1693 is the companion code from the partner module. Together they point at a broken or absent handshake, which is exactly what the delete addresses.

Does the delete affect my gauges, transmission or other modules?

No. The delete targets the immobilizer requirement inside the engine controller. Your transmission strategy, gauges and other modules are unaffected.

Will this pass inspection or affect emissions?

The delete does not touch emissions controls or the VIN. We do not delete cats, EVAP, EGR or any required emissions equipment. Emissions and inspection compliance for your specific vehicle and use are your responsibility; the delete is for repair, swap and off-road situations.

Can you delete SKIM on a push-button WIN car?

The Wireless Ignition Node era integrates the ignition and immobilizer differently from the early SKIM modules. Tell us the exact year, model and controller before ordering and we will confirm whether your specific controller is within this service.

What if my controller turns out to be faulty hardware?

We verify the delete on the bench before shipping back. If a controller cannot be deleted because of a genuine hardware fault, we tell you and we do not charge for work we could not deliver.

The bottom line

The Sentry Key system is doing its job when it refuses to keep your engine running after a swap, a salvage PCM install, or a missing immobilizer; the secrets simply no longer match. Deleting the handshake inside SBEC3, JTEC or NGC controllers removes that dependency so the engine starts and runs on a chipped key, a plain key, or nothing at all. It is a focused service: not a key-programming job, not a mechanical repair, not an emissions defeat, and not a VIN change.

If that is your situation, start with the Chrysler SKIM / Sentry Key delete. You can browse the full services list, see exactly how the mail-in process works, or read about founder Adrian Torres and the bench experience behind every delete. Ship the controller to 1168 W Pioneer Parkway, Arlington TX 76013, and expect a 24-hour bench turnaround, with flat-rate return shipping chosen at checkout (from 14.95 dollars).