2004-2005 Chrysler Pacifica Anti-Theft Module: Solving Crank-No-Start and SKIM Programming

Symptoms of a Failing Anti-Theft Module

A faulty SKIM module in a 2004-2005 Chrysler Pacifica produces very distinct symptoms. Being aware of them can save you from unnecessarily replacing other parts like the fuel pump or starter.

• Engine Starts, Then Immediately Stalls: This is the most common and definitive sign of a SKIM system failure. The engine will crank, fire up, run for approximately two seconds, and then shut off abruptly. This happens because the PCM does not receive the correct authorization signal from the SKIM and cuts fuel supply.
• Flashing Red Security Light: A small red dot or a key symbol on the instrument cluster will flash rapidly or stay illuminated when the key is in the 'On' position. This light indicates that the security system has been activated and is preventing the vehicle from running. A normally functioning system will have this light turn on briefly for a bulb check and then go out.
• 'No Start' or 'Crank-No-Start' Condition: In some cases, the vehicle may not crank at all, or it may crank but never fire. This can happen if there is a complete communication breakdown between the SKIM and the PCM.
• Key Not Recognized: The vehicle may behave as if an incorrect key is being used, even with the original key. Trying a spare programmed key is a good diagnostic step; if the spare key also fails to work, the problem is more likely the module or antenna ring rather than the key itself.

Common Diagnostic Trouble Codes (DTCs)

A professional scan tool can pull specific codes from the vehicle's computer that point directly to the anti-theft system. Common codes include:

• P0513: Invalid SKIM Key
• P1685: Skis Invalid Key
• P1686: No SKIM Bus Message Received

Diagnosis and Replacement

Location

The SKIM module is a small black box located on the steering column. It is attached to a plastic ring, which is the antenna, that fits directly around the ignition lock cylinder where you insert your key. To access it, you typically need to remove the plastic shrouds around the steering column.

Programming: The Most Important Step

Physically replacing the SKIM module is simple, but it will not solve the problem. The new or used module is essentially a blank slate and must be programmed to the vehicle. This process 'marries' the replacement SKIM to your existing PCM and keys.

• Who Can Program It? This procedure requires a professional-grade scan tool with immobilizer capabilities. A Chrysler dealership using a DRB III or newer tool can perform the programming. Many certified automotive locksmiths and some independent repair shops with advanced tools (like Autel or Snap-on) can also do this. This is not a DIY task without the proper equipment.
• The 4-Digit PIN: To program the module, the technician needs the vehicle's unique 4-digit security PIN. This PIN can sometimes be obtained from a Chrysler dealer's service department with proof of ownership. Alternatively, locksmiths with specialized tools can often extract the PIN from the original SKIM module or the PCM.

Alternative Repair: SKIM Delete Service

A popular and often more affordable alternative to replacing and reprogramming the module is a 'SKIM Delete' service. This involves sending your vehicle's original PCM to a specialist who will reprogram it to completely remove the immobilizer function. Once the PCM is reinstalled, the vehicle will no longer look for a signal from the SKIM module and will start with any correctly cut key. The SKIM module must be unplugged for this to work. This is a permanent solution that can prevent future SKIM-related issues.

Buying a Used Anti-Theft Control Module

Purchasing a used SKIM module is a cost-effective option, but you must understand what you are buying. A used module is simply a functional piece of hardware that needs to be programmed to your specific vehicle.

• Verify the Part Number: Ensure the part number matches your original module. The known OEM part number for 2004-2005 Pacificas with the headlamp delay feature is 4727380AE. Using an incorrect module may lead to programming failure or other electrical issues.
• Physical Inspection: Check for any signs of physical damage, such as cracks in the casing, bent pins on the connector, or signs of water intrusion or corrosion. However, since it's an electronic part, its internal functionality is more important than its cosmetic appearance.
• Source Matters: Buy from a reputable seller that offers a warranty and guarantees the part is functional. A module from a vehicle that suffered flood or fire damage should be avoided at all costs.
• Mileage is Irrelevant: The mileage of the donor vehicle does not matter for a SKIM module, as it will be completely reprogrammed for your vehicle's VIN and keys.

Known Issues, Recalls, and TSBs

While there are no specific recalls for the SKIM module on the 2004-2005 Pacifica, there is a relevant recall to be aware of.

• NHTSA Recall 06V432000: This recall addresses a software issue in the Powertrain Control Module (PCM) that could cause the engine to stall. Since the SKIM and PCM work together, ensuring your vehicle's PCM has the latest software from the dealer can be a crucial diagnostic step to rule out other causes of stalling.

Cost Breakdown

The cost to fix a SKIM issue can vary significantly depending on the chosen repair path.

Frequently Asked Questions (FAQ)