GMC Envoy XL - Recent Questions, Troubleshooting & Support

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Have you cleaned the mass air flow sensor it could also be going out on you. Also is it cranking like a motor with a carburetor on it??

could have faulty turn signal switch because the brake light circuit flows through the turn signal switch.

Make sure it's all the way in park turn the key on let all the dash lights go out then turn the key over then if that don't work I will suggest checking spark plugs for other signs of problems

Bad plug or broken wire at the plug, at the alternator. Pull the plug off the alternator. Turn the key on and check for power and ground at the leads. No reading, probe the wires a couple inches back. If a read there fix or replace the plug. If you have a 3 wire plug, best to use an ohm meter. Test each wire separately. At the pin and a couple inches back on the wire. This test may include testing the wire back to the PCM and fuse panel. You'll need wiring schematics for this. The PCM is what fields the alternator to charge and supply power when the engine is running.

Air temperature and delivery are controlled via small actuators on the heating, ventilation & air conditioning (HVAC) box located behind the dashboard. These actuators operate doors inside the HVAC box in order to channel air through different passages to achieve the desired result. A "blend" door actuator can channel air through the heater core, around the heater core or a mix of these two to achieve the desired temperature. A "mode" door actuator can direct airflow to the ducts that lead to the defrost vent, front vent, floor vent or a mix between. When a vehicle has dual climate control (where driver and passenger sides of the vehicle can have different air temperatures) there can be multiple of actuators of each type which can make diagnosis difficult. The first step would be to retrieve diagnostic trouble codes (DTCs) from the HVAC Control Module using an advanced level scan tool; these codes help determine the location of the issue and if it's an electronic or mechanical failure. Electronic failures would include items such as HVAC control module failure, actuator circuit failure or actuator failure. Mechanical failures would include items such as actuator failure or internal HVAC box door failure. You can read more here: https://www.yourmechanic.com/article/what-components-of-the-heating-and-ac-system-are-most-likely-to-fail

Hello and welcome to FixYa!

You may have system failure that's why this issue occur. I strongly suggest that you remove the positive battery connector and let it sit for atleast 10mins. before reconnecting it.
This will reset the system and can get your vehicle back to it's normal operation.
Hope this helps and thank you for using FixYa! Have a good one!

Is the check engine light on ? Usually a solenoid or valve body problem.

ST/LP, Fuse 12, 25 Amp - feeds battery positive to brake switch ORN (orange) and out the WHT (white).

Test with a simple automotive incandescent test lamp to ground. Test lamp should light on both sides of the fuse and with contact to the switch ORN and to WHT while brake depressed.

Plugging it into a diagnostic system or an OBD2 scanner could give you trouble codes as clues as to what's wrong. This will cost you for this service so shop around as price can be very different from company to company.. There are good mobile auto electricians out there who can come to you. Most modern vehicles have a built in immobilizer system. The ignition key and switch are part of it. Each ignition is coded to only that vehicle. By changing the switch you might have triggered this system and making it think that the vehicle has been stolen. If you have triggered the immobilizer and need to re-code the ignition you might have to go to a dealership to get it done.

IF THE GEAR IS OF CABLE SHIFT, CHECK THE CABLE.
IF IT IS NORMAL ONE, CHECK THE CONNECTING RODS UNDER THE CHASSIS FROM THE GEAR LEVER.
TIGHTEN THEM.. CHECK IT
PLS VOTE!!

Hi, with most vehicle there may be a problem that you can identify, yours may have a few issues. I think you would benefit from a visit to a trans specalist to check the box over then go from there once that issue is sorted or discounted as the cause of problems. Your description appears complex/compound...i.e. there are possibly a few things going on at the same time

what switch theirs only about 7

i know few error codes/ fault codes, wiring diagrams, schematic diagrams, torque specs, engine fo, switches functioning, assemble, disassembly, complete refurbish, repair, installation every single thing is covered within seconds u can get the access and it's totally illustrative complete

The testing procedure is fairly long ,to much to post here . The first test would be to hook up a factory or some other professional type scan tool an check for DTC'S - diagnostic trouble codes . Auxiliary HVAC Control Module The auxiliary HVAC control module is a class 2 device that interfaces between the rear seat occupants and the auxiliary HVAC system to maintain auxiliary air temperature and auxiliary air distribution settings. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). If the battery positive voltage circuit loses power, all auxiliary HVAC DTCs and settings will be erased from KAM. The auxiliary HVAC control module will perform a recalibration of the electric actuators when commanded with a scan tool or if KAM is lost. This will ensure the actuators are moving with in the calibrated range. During this calibration process the auxiliary blower motor will be disabled for up to 3 minutes. Do you know what class 2 is ? It is a serial data network for the control modules to talk to each other . Air Distribution - Auxiliary Control The auxiliary HVAC system provides ventilation for the rear seat occupants. The auxiliary mode actuator shares a control circuit with the auxiliary air temperature actuator. The auxiliary mode is controlled by a rotary knob on the auxiliary HVAC control module. If change of position is required for both actuators, then the auxiliary HVAC control module positions the auxiliary air temperature actuator first. All control circuits for the auxiliary actuators are at a low voltage potential until a change of position is required. The module then applies a high voltage potential to the appropriate control circuit, which will rotate the actuator. Air Speed - Auxiliary There are two separate controls for the auxiliary HVAC system. There is the front auxiliary blower motor switch and the auxiliary HVAC control module. If the front auxiliary blower motor switch is in any other position than OFF or REAR, then the auxiliary air temperature actuator mimics the set passenger temperature. The auxiliary mode will mimic the primary mode. If the front auxiliary blower motor switch is in the REAR position, then the system will only function with inputs to the auxiliary HVAC control module. If the front auxiliary blower motor switch is in the OFF position, then the auxiliary HVAC control module does not respond to input. The auxiliary HVAC control module can not request A/C operation from the PCM. The rotary blower switch on the auxiliary HVAC control module provides the operator the ability to select several blower speeds. The auxiliary HVAC control module provides a pulse width modulated (PWM) signal to the auxiliary blower motor through the auxiliary blower motor speed control circuit. The auxiliary blower motor changes speed based on the received PWM signal from the auxiliary HVAC control module. Power and ground are provided to the auxiliary blower motor through the battery positive voltage and ground circuits. Power and ground are provided to the auxiliary HVAC control module by the ignition 3 voltage and the ground circuits. Auxiliary Console Mode Actuator The auxiliary console mode actuator is a 5 wire bi-directional electric motor that incorporates a feedback potentiometer. Low reference, 5 volt reference, position signal, and two control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the auxiliary HVAC control module grounds one of the control circuits while providing the other with 12 volts. The control module reverses the polarity of the control circuits to move the actuator in the opposite direction. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts. The auxiliary HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted, value, one of the control circuits is grounded. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module grounds both control circuits. Auxiliary Mode Actuator The auxiliary mode actuator is a 5 wire bi-directional electric motor that incorporates a feedback potentiometer. Low reference, 5 volt reference, position signal, and two control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the auxiliary HVAC control module grounds one of the control circuits while providing the other with 12 volts. The control module reverses the polarity of the control circuits to move the actuator in the opposite direction. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts. The auxiliary HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted, value, one of the control circuits is grounded. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module grounds both control circuits. It's nice to know how thing's work before trying to fix it .

Mattkirkham - it could be loose bolts...or your water pump is going bad...view this link it should help you. http://forums.trailvoy.com/showthread.php?t=58351

I don't think the piece of rubber has anything to do with the functionality of the latch itself it usually there for keeping the latch quiet like no rattle or metal noise on the road. Hope it helps

Envoy 2002 2008 Workshop Service repair manual My personal suggestion would be to go for these repair catalogs. I know this website reliable-store that i used to buy them from, and they sold online it was very good manual. Go ahead, I bet.

Going up hill's an loses power , plugged catalytic converter . No relay for the cruise control . Your best bet , take your vehicle to a qualified repair shop.