I have a 2001 f150 4.2 the induction coil "ignition halo broke flashes 12 on theft light says its tranceiver issue can i put a remote start system on this without buying a new halo ring?

Forget the other flash codes, this is the main one you need to diagnose an fix.

B1681 PATS Transceiver Module Signal is Not Received PCM GO to Pinpoint Test E .
Do you know how to do electrical testing using a Voltmeter?

E2 CHECK THE PATS TRANSCEIVER FOR VOLTAGE CIRCUIT 16 (RD/LG)
PATS Transceiver C2097
Measure the voltage between the PATS transceiver C2097 pin 2, circuit 16 (RD/LG), harness side and ground.

• Is the voltage greater than 10 volts?

Yes GO to E3 .

No REPAIR the supply circuit. CLEAR the DTCs. TEST the system for normal operation

If the ignition switch and key are ok. The steering wheel lock can be easily disengaged by rocking the steering wheel back and forth and at the same time. Try to rotate the ignition from run to start. If the anti-theft light is flashing there should be an active fault within the security system. GM has a sensitive ignition switch you are not suppose to hang anything from the ignition key. The weight can damage the halo (part of the anti-theft system). Please write back and give me an idea of what you are looking for and how you want to proceed. Good Luck.

ignition system needs to be flashed to vehicle --ignition system is not being recognized

Is the red light on the top center of the dash pad flashing fast when trying to start ? The engine doesn't turn over ?
Anti-theft system problem !
PATS uses a visual theft indicator. This indicator will prove out for three seconds when the ignition switch is turned to RUN or START under normal operation. If there is a PATS problem, this indicator will either flash rapidly or glow steadily when the ignition switch is turned to RUN or START. PATS also "blips" the theft indicator every two seconds at ignition OFF to act as a visual theft deterrent.
PATS differs from the perimeter anti-theft system in that PATS enables and disables the engine from starting. If equipped, the perimeter anti-theft system protects the perimeter of the vehicle (doors, hood and trunk) and sounds an alarm.
The PATS is not compatible with aftermarket remote start systems, which allow the vehicle to be started from outside the vehicle. These systems may reduce the vehicle security level, and also may cause no-start issues. Remote start systems must be removed before investigation of PATS-related No Start issues.

Is there a light that says SECURITY somewhere on the dash? These cars are notorious for failing anti theft systems that lock out the starter. This link explains and offers DO IT YOURSELF solutions.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Monte Carlo with VATS and Passlock issues.

The theft indicator on the instrument cluster will operate as follows:
• When the ignition is OFF, the theft indicator will flash briefly every two seconds to indicate the SecuriLock system is protecting your vehicle.
• When the ignition is turned to ON or START, the theft indicator will light for three seconds and then go out. If the theft indicator stays on for an extended period of time or flashes rapidly, have the system serviced by your dealership or a qualified technician.

Hope helps.

Theft light is it flashing, if it is that's the problem, get in car turn key to on wait about 10mim or so till light stop's flashing, turn key to off then start car. also check for fuel pressure up on fuel rail, if you have fuel pressure not theft system, also check for spark at spark plug or coil pack's which ever easier to check, if no spark possible bad crankshaft sensor, could be a bad coil pack or ignition module but it would still start but with a bad miss.

the issue is the securilock system I installed one in my 03. You need a spare coded key (one that starts the vehicle) and a Bulldog 791 kit. ths will store the spare key and tell the vehicle it is not being stolen. Its the only way unless you want to leave your key in the ignition. BTW, the Theft light is on when you engage the remote started w/o the key in the ignition, Been there.

theft light should be flashing when system is armed. It should reset itself. If on steady, you have a probelem. Try your other key first. This inof should help you. Report back if you still need help.

Anti-Theft —Passive The passive anti-theft system (PATS) contains the following components:

• theft indicator
• encoded ignition key
• PATS transceiver module
• powertrain control module (PCM)
• standard corporate protocol (SCP) communication network

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Principles of Operation
The PATS uses a specially encoded ignition key. Each encoded ignition key contains a permanently installed electronic device called a transponder. Each transponder contains a unique electronic identification code out of over 18 billion, billion combinations.
The passive anti-theft system (PATS), also known as SecuriLock ®, uses radio frequency identification technology to deter a driveaway theft. This system is known as Securilock® in North America, Safeguard® in the U.K., and PATS in Continental Europe. Passive means that it does not require any activity from the user.
The SecuriLock® System (PATS) is not compatible with aftermarket remote start systems, which allow the vehicle to be started from outside the vehicle. These systems may reduce the vehicle security level, and also may cause no-start issues. If equipped the remote start system must be removed before investigation of PATS-related, no-start issues.
Each encoded ignition key must be programmed into the vehicle's powertrain electronic control (PCM) before it can be used to start the engine. There are special diagnostic repair procedures described in this section that must be carried out if a new encoded ignition key is necessary.
This system contains a new feature named Unlimited Key Mode. This feature allows a customer to program more than eight keys to the vehicle if they request it. Each vehicle in Unlimited Key Mode is set up with a special Unlimited Transponder Security Key. This allows all the customer vehicles to share the same keys, but no other keys from outside can be used to operate the vehicles. For an individual customer, any randomly selected Security Key is acceptable. Refer to Unlimited Key Mode Programming in Key Programming Switch State Control in this section.
The PATS transceiver module communicates with the encoded ignition key. The module is located behind the steering column shroud and contains an antenna connected to a small electronics module. During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and sends data to the PCM.
The control functions are contained in the PCM. This module carries out all of the PATS functions, such as receiving the identification code from the encoded ignition key and controlling the engine enable. The PCM initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.
All elements of the PATS must be functional before the engine is allowed to start. If any of the components are not working correctly, the vehicle will not start.
The PATS uses a visual theft indicator. The indicator will prove out for three seconds when the ignition switch is turned to RUN or START under normal operation. If there is a PATS concern, this indicator will either flash rapidly or glow steadily when the ignition switch is turned to RUN or START. The PATS system also flashes the theft indicator every two seconds at ignition OFF to act as a visual deterrent.
The following will activate the PATS and will disable the vehicle from starting:

• incorrectly encoded ignition key
• damaged encoded ignition key
• unprogrammed key
• non-encoded key (key has no electronics)
• damaged wiring
• damaged transceiver
• damaged PCM

Inspection and Verification

1. Verify the customer concern by operating the system.

1. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart Mechanical Electrical

• Large metallic objects, a second ignition key on the same key ring as the PATS ignition key or electronic devices on the key chain that can be use to purchase gasoline or similar items
• Ignition lock cylinder
• PATS key
• Use of a non-PATS key
• More than one PATS key on key chain

• Central junction box (CJB) fuse 16 (15A)
• Battery junction box (BJB) fuse 20 (15A)
• PATS transceiver module
• Ignition switch
• Loose or corroded connection(s)

These cars had a tendency to "lose" the password for the theft deterrent system. Your body control module doesnt understand your key, therefore tells your pcm to discountinue fuel supply. To reprogram the system, start the engine and let it stall. Leave the key in the run position. The theft light should flash for 10 minutes. When the light stops flashing, Turn the ignition off for 10 seconds. Turn the ignition back to the run position. This procedure tells the BCM that on the next ignition cycle, to accept the new password. Now, it should start. If not, it may require the clearing of the code, and possibly the reprogramming of the PCM, which needs to be done with a dealer scan tool or equivilant.