My car sounded like it wanted to start but doesn't so a friend of mine hooked up his device to run diagnostics and got an "unregistered transponder" error, what does that mean

Linking Error w/ OBDII Diagnostic scanner (unable to communicate ...

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Nov 16, 2010 - When I try to run the scan (initial link-up. ... the device keeps saying"Linking Error," meaning that the OBDII and diagnostic device aren't able to communicate. .... autozone and have them hook their scanner up for free to verify.

What am i doing wrong? obdII scanner hookup? - D-series.org

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Sep 16, 2009 - 21 posts - ‎8 authors
well i borrowed my friends obdII scanner and im trying to check my codes but everytime is says link error? im stumped i tried it multiple times with. ... but it sounds like you may have an electrical problem somewhere. Discovery ...

"Linking Error" OBDII Comm failure ' DSMtuners

Testing would need to be done , scan tool hooked up checking DTC'S - diagnostic trouble codes . View data etc...
Keyless Entry System Description and Operation - Active
The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the door locks to unlock the vehicle. Keyless entry will lock/unlock a door or open the rear compartment lid when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the remote control door lock receiver (RCDLR). The RCDLR interprets the signal and activates the requested function via a serial data message. A low transmitter battery or radio frequency (RF) interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High RF traffic areas, such as gas stations that use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following features:
• Door lock/unlock
• Rear compartment lid release
• Illuminated entry lamps
• Panic alarm/Vehicle locator
• Remote vehicle start

Your best bet , take it to a qualified repair shop . Dealer

first google hit lands.
DTC P1623: Unregistered Transponder
Wiring Diagram
Refer to "Immobilizer Control System Wiring Circuit Diagram:
talk to Suzuki this is their magic box.
id sell mine, but its worth zero. so will drive my 04vitara v6 to the ground.
or get a full factory service manual while you still can.
suzuki is chapter 11 here for CARS/Trucks, (USA /Canada)

This Diagnostic Trouble Code (DTC) is output when the Engine Control Module (ECM) detects errors in communication between the Transponder Key Electronic Control Unit (ECU) assembly and the ECM, or in the communication lines. This DTC is also output when an engine start is attempted while the ECU communication ID between the transponder key ECU assembly and the ECM is different.
Possible causes Faulty Key Faulty transponder key amplifier Faulty Transponder Key Electronic Control Unit (ECU) Transponder key amplifier wire harness Faulty Engine Control Module (ECM)

Having the vehicle checked for DTC'S - diagnostic trouble code's an doing diagnostic's for the code is the proper way to diagnose , not guessing . No you cant reset it or disengage it ,need factory or professional scanner .

These vehicles use Fords Securilock transponder system to prevent vehicle theft. Basically, there is a little radio chip in the key that transmits a code to the computer when you start the car. If this code doesn't match the computer, the computer disables fuel and spark so the engine won't run. If you have a spare key, try that to see if it works. If it doesn't work, then the Securilock system needs service. Unfortunately only the dealer can service this system because it is integrated into the vehicle computer.

If your spare key works, then the key you tried to use has a damaged transponder and the key needs to be replaced. If you don't have a spare key, contact a locksmith and have them make you a new key. I have to warn you, transponder keys are not cheap. They can cost easily $75 and some even go for $150. But, that is probably cheaper then having Ford make one and even if the spare doesn't work, when you get the system fixed by the dealer they can program your spare key as well so you don't waste the money on the key.

Anti-theft light on ( car an padlock symbol ) when trying to start the vehicle with the second set of key's ? Do you know how GM anti-theft system works ? There is a transponder in the head of the key . Around the key lock cylinder is a coil of wire ,when you stick the key into the lock cylinder ,this coil of wire energizes the transponder in the key head . A module the coil of wire is hooked to reads code of the tansponder . Everything is controlled by a module , BCM - body control module , PCM -engine computer , anti-theft module . You can research all you want ,you won't be able to trouble shoot without factory or professional type scan tool , service information , checking diagnostic trouble codes . Your buick has more computer power then the space shuttle has . Serial data communication networks . Your best bet , take it to the buick dealer .

dear friend- if the lamp keeps on flashing the there is something wrong with the transponder.i seggest you hook up to a scanner to get a proper fault code.

dear friend:this might sound stupid,but remove the key from the barrel and try again,then see if the dash lights dim when trying to start,if it does the battery is to flat to turn the engine,if it is a auto shift the lever slightly forward and backward to make sure it is not the neutral switch.

Sounds to me like you are using un-registered key. The key has a transponder in it. If you use unregistered key, the security light will just stay on steady after you take the key out and lock the car. Check it to see if it does that. But by what you are saying, you are using unregistered key.