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I have a 07 that the key wont crank the car. It will turn the ignition but nothing happens. Car starts with my other key without a problem.


The key worked and all of a sudden stopped. Tried changing the battery.


Will the simple "off-run" sequence solve the problem?


(my wife lost her purse with our only working key....need to get our car)

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First try this! remove your key chain and all other keys and metal objects, speed passes etc. from around your key. They can prevent the key transmitter from operating correctly. The battery in the key is only used for the door remotes and has nothing to do with the antitheft system.


If the car cranks and doesn't start, the key could be the problem. If the car doesn't crank it probably isn't the key (unless it doesn't turn in the lock.) If the PATS doesn't detect the correct key it will crank and just not start. I do not understand how you can have a good key that works and one that doesn't work for cranking if they both turn in the lock

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Are these both original IKT keys, or did you replace one or both of them before? If the key has lost its' programming or is only a physical key, I could see it POSSIBLY not cranking.


A PATS no-start may involve a vehicle no-start due to either the fuel injectors not operating or the starter not operating (or both). If the PATS theft light does not prove out and one (or both) of the previous conditions are present, it may be due to a PATS issue. If the theft light proves out, and the vehicle does not start, it is probably not a PATS issue. Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual. If the theft light does not illuminate at all, it may be an instrument cluster issue. Refer to the Symptom Chart in this section for additional information. A low battery voltage may cause the PATS to allow starter operation, but may keep the fuel injectors from operating.


PATS Operation

The PATS function is controlled by the instrument cluster. With this type of PATS, there are parameters that need to be reset if either the instrument cluster or the PCM (or both) are replaced. Refer to Passive Anti-Theft System (PATS) Parameter Reset in this section. When the PATS key is turned to the ON or START position, the instrument cluster initiates the key interrogation sequence by sending a voltage signal to the PATS transceiver. The transceiver then uses its antenna to bounce a signal off the transponder in the PATS key. This process "reads" the PATS key identification code and sends the key identification code back to the instrument cluster, which interprets it and determines if it matches one of the stored key codes. If it does match one of the stored key codes, the instrument cluster will send a message to the PCM to ground the starter relay solenoid coil and to also allow the fuel injectors to operate. If it does not match one of the stored key codes, or it is only a partial key read or no key read, the instrument cluster will send a message to the PCM to not ground the starter relay solenoid coil and not allow fuel injector operation. The anti-theft indicator in the instrument cluster will flash (or may glow steadily) and the instrument cluster will store one or more DTCs. All elements of PATS must be functional before the vehicle will start. If any of the components are not working correctly, the vehicle will not start. If the instrument cluster must be replaced for any reason (PATS concerns or instrument cluster concerns), the PATS keys must also be programmed into the new instrument cluster. Refer to Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment in this section.


Edited by WWWPerfA_ZN0W
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