KHLow is correct in that the brake switch controls the solenoid that moves the shifter interlock so it can be moved.
There is a National Highway and Transportation Safety Administration, (NHTSA), bulletin on this and a Service Bulletin from GM in regards to a process of elimination to follow for technicians.
The following is the NHTSA bulletin;
Make : CHEVROLET Model : AVEO Year : 2004
Manufacturer : GENERAL MOTORS CORP.
Service Bulletin Num : 070730007 Date of Bulletin: APR 01, 2007
NHTSA Item Number: 10022265
Component: POWER TRAIN:AUTOMATIC TRANSMISSION
AUTOMATIC TRANSAXLE/TRANSMISSION SHIFT LEVER MAY NOT SHIFT OUT OF PARK (REPLACE BRAKE TRANSAXLE SHIFT INTERLOCK (BTSI) SOLENOID). *KB
Take that bulletin number to your dealer and see if they can help.
I checked for more public information bulletins released by GM and came up with this Public Information Bulletin, (PIB), otherwise known as a Service Bulletin.
The following is the GM Service Bulletin;
Shifter Stuck in Park
Before replacing any components, verify correct operation of the Stop Lamp Switch. Check for proper adjustment of the switch, poor electrical connection at the switch or incorrect operation of the switch contacts and repair as necessary. It has been identified that the brake switch is more likely the cause compared to the shifter assembly.
Do NOT replace the shifter unless the brake switch has been replaced or adjusted and the condition returns again.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from this information.
The last sentence, "whether your vehicle may benefit from this information.", Refers to the VIN numbers that were affected before GM caught the problem and fixed the problem on the production line. Your vehicle may fall into the VIN numbers that did not get the fix at the factory and are eligible for the retro-fitted fix from a GM dealer.
If you have these with you when you go to your local GM Dealership, they will possibly work with you. One scenario may be that the parts are free if you pay for the labor.
I hope this helps and let me know how things turn out.
Tuesday, February 8th, 2011 AT 4:22 AM