20 Most Recent 2003 GMC Envoy - Page 6 Questions & Answers

You pour it into the fuel tank with a full tank and run it out.

Look along side the frame on the drivers side to see if there is the parking brake cable visible. If it is then there is an adjustment nut there that will put more tension on the cable.

The body control module needs to be looked at.

The coil pack will be numbered. Find coil #3 and follow the spark plug wire to the spark plug.

You have to take the steering wheel off. If you have a tilt wheel, you need special tools to get past the lock plate. You have to remove power to the air bag too. Usually those are the green connectors on the drivers side fenderwell.

Shift solenoid A circuit electrical. Means there is no voltage getting to the solenoid. The solenoid is inside the transmission oil pan.

You may lose the Bose amp too. That would be no sound from the speakers too. I don't think they will exchange.

Inside the transmission pan

cooling fan 1 control circuit, The fan motor may be dragging the voltage down.

The switch may be bad or the park switch inside the wiper motor had failed.

It's on the drivers side down low on the engine block.

Coil packs was the problem in the first place. When a spark plug misfires, the high voltage goes no where and the coil starts to deteriorate. After prolonged misfire the coil will not make the hi voltage necessary to fire the plug. Replace the coil packs.

The sensor is located behind the crank pulley mounted to the timing chain cover.

The switches that operate the seat is the first place to look. Lack of lubrication on the seat mechanism will stall the motor too.

You have to take the motor off and use one of the flex shafts in an electric drill. Lube the track with wd40 before doing that to see if the seat will move before you take out the motor.

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check the LPG pressure regulator, u may have low gas pressure.

I would check the PARK / BRAKE electrical solenoid switch. Designed to not allow the driver to put the car into gear without stepping on the brake at the same time.

I believe the sensor is in the door latch/lock the only way to fix is replace it. I had a similar problem and the door worked as designed.

It will be on the bell housing gear box area.