A frustrating issue some Ford owners face is an intermittent no-start or hesitant start, often accompanied by a flashing theft light. This problem can be caused by a variety of issues, but one common culprit is a faulty Passive Anti-Theft System (PATS), indicated by the B1600 trouble code. This article details a personal experience with this problem and offers a potential solution.
Understanding the B1600 Code and PATS
The B1600 code signifies that the PATS module, responsible for vehicle security, is unable to recognize the key’s transponder chip. PATS prevents unauthorized vehicle operation by requiring a coded key for starting. When the system fails to read the key, the engine will not crank or may hesitate before starting, and the theft light will flash a specific code sequence. Code 13, which translates to B1600, indicates a key recognition issue.
Image: Example of a Ford PATS key with its integrated transponder chip.
Troubleshooting a B1600 Code: A Case Study
Recently, a newly cut and programmed PATS key began causing intermittent starting problems, characterized by hesitation or a complete no-start condition, along with the flashing theft light (code 13/B1600). Suspecting a faulty transceiver, the component surrounding the ignition cylinder that reads the key’s chip, a replacement was installed. Unfortunately, the issue persisted.
Image: A transceiver, the component that reads the PATS key’s signal.
The Solution: A Second Key
As a last resort, the second newly cut key was tested. Surprisingly, the vehicle started immediately and consistently with the second key. Repeated tests confirmed that the first key consistently caused starting problems, while the second key functioned flawlessly.
This led to the conclusion that the first key, despite being brand new, had a defective transponder chip. The locksmith confirmed this was uncommon but possible. A new chip was ordered to rectify the issue.
Image: A device used for programming new keys to a vehicle’s PATS system.
Key Takeaway: Try a Different Key
If you encounter a B1600 code or experience similar starting problems with your Ford vehicle, before delving into complex diagnostics, try a different PATS key. Even new keys can be defective, and a simple key swap could save you time and money. This experience highlights the importance of having a spare programmed key and testing all keys when encountering PATS-related issues. If a second key resolves the issue, contact a qualified locksmith or Ford dealership to replace the faulty key’s transponder chip.
