2004 GMC Envoy - Page 3 - Answered Questions & Fixed issues

Could be a lot of things (sensors like the MAF, EGR, etc) but I would first check the throttle position sensor (TPS).

There are two different ones. One for manual controls called blower motor resistor, and one for automatic controls (digital), called blower motor module. Look similar, but different.

Check the vehicle for DTC'S - diagnostic trouble code's should be the first step in diagnosing this problem . But a tune - up not ! Reduced enging power is caused by a problem with the electronic throttle control . If you are not familiar with this ,your best bet would be to take to a qualified repair shop. REDUCED ENGINE POWER: Refer to Powertrain Control Module Description in Engine Controls - 4.8L, 5.3L, and 6.0L Throttle Actuator Control (TAC) Overview The throttle actuator control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle blade. This eliminates the need for a mechanical cable attachment from the accelerator pedal to the throttle body. This system also performs the cruise control functions as well. The TAC system components include, but are not limited to the following: • The accelerator pedal position (APP) sensors • The throttle body • The powertrain control module (PCM) Each of these components interface together to ensure accurate calculations and control of the throttle position (TP) Accelerator Pedal Position (APP) Sensor The APP sensor is mounted on the accelerator pedal assembly. The APP is actually 2 individual APP sensors within 1 housing. There are 2 separate signal, low reference, and 5-volt reference circuits. APP sensor 1 voltage increases as the accelerator pedal is depressed. APP sensor 2 voltage decreases as the accelerator pedal is depressed. One of these sensors could be sending conflicting data to the PCM - engine computer . Reduced Engine Power Mode When the PCM detects a problem with the throttle actuator control (TAC) system the PCM enters one of the following Reduced Engine Power Modes: • Acceleration Limiting--The control module will continue to use the accelerator pedal for throttle control, however the vehicle acceleration is limited. • Limited Throttle Mode--The control module will continue to use the accelerator pedal for throttle control, however the maximum throttle opening is limited. • Throttle Default Mode--The control module will turn off the throttle actuator. • Forced Idle Mode--The control module will perform the following actions: - Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off. - Ignore accelerator pedal input. • Engine Shutdown Mode--The control module will disable fuel and de-energize the throttle actuator. Throttle Body Assembly The throttle body for the throttle actuator control (TAC) system is similar to a conventional throttle body with several exceptions. One exception being the use of a motor to control the throttle position instead of a mechanical cable. Another exception is the throttle position (TP) sensor. The TP sensor is mounted in the throttle body assembly. The TP sensor is 2 individual TP sensors within the throttle body assembly. Two separate signal, low reference, and 5-volt reference circuits are used to connect the TP sensors and the powertrain control module (PCM). TP sensor 2 signal voltage increases as the throttle opens. TP sensor 1 signal voltage decreases as the throttle opens.

Clean the Throttle motor bore.

The transfer case is in low gear but the front axle actuator is not locking the front diff. This is an electronic problem and there will be C chassis codes generated. have the vehicle scanned for DTC's.

That is where it goes. The Radio head unit needs to be sent out for repair. That is the message that it will give when not working/reading the disk. Mine does the same thing.

You need to look up how to reprogram the Key FOB and it's a simple task, typically turning key on hitting lock button on Fob and repeating process until doors lock. You will have to get into the vehicle to do this of course. You may have to look up the exact process for that particular model.

This is right from GMC service repair manual Odometer The vehicle odometer is calculated and stored electronically in the instrument panel cluster (IPC). The base IPC contains a season odometer and a trip odometer. The uplevel IPC contains a season odometer and two trip odometers. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The IPC calculates the mileage based on the vehicle speed signal circuit from the engine control module (ECM). The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers as requested by the activation of the Personalization button on the steering wheel controls.

I don't know

loose connection or you are overloading outlets,if your trying to draw more than 15 amps continiously i'd reccomend fused wiring back to battery or main fuse box

Have you changed the filter and fluid lately. Check your service manual to see how often that needs to be done.

Reset airbag light ????? Light on ,problem with the system , DTC'S - diagnostic trouble codes set in air bag control module . Have the codes diagnosed ,fix the problem an the light will reset it's self . Your best bet ,take your vehicle to a qualified repair shop.

U need to remove the door's inside panel and reattach the mechanism that controls the door lock.

just the solenoids need attention they are add- ons for the transmission and the transmission is ok

Need to remove inner panel and check the gears. You can also disconnected the motor so your battery won't drain.

In my opinion, it's almost certainly the radio. Even when turned off, it is still alive managing a few other things (like chimes) until you exit the vehicle, and I suspect that part of the radio is faulty.

door skin is the metal part of door --door panel is usually removed to access the inner workings --remove the panel screws and pry gently to release the clips and panel comes off

The regulator is bad possibly . Have to take the panel off the end gate to check it . Endgate Power Window System Components The endgate power window system consists of the following components: • Endgate window switch • Endgate key cylinder switch • Endgate window interior emergency switch • 4th button of the key fob • Power roof switch • Endgate window regulator • Endgate module • Power roof module • Endgate regulator 30-amp circuit breaker If you hear the motor run ,has to be a problem with the regulator . Removal Procedure Swing the endgate open. Remove the regulator bolt access plugs (3). Remove the endgate trim panel. Refer to Endgate Trim Panel Replacement . Remove the endgate inner panel reinforcement. Refer to Endgate Inner Panel Reinforcement Replacement . Remove the endgate window. Refer to Endgate Window Replacement . Remove the bolt (3) retaining the regulator to the endgate. Loosen the nuts (1) retaining the regulator rails to the endgate. Remove the regulator by sliding the regulator side rails up and out of the keyhole slots (2) in the gate. You mite find a video on youtube on how to do this job.

Rob, when the battery is disconnected for any reason a couple of things happen, and frankly it's a design error on the GMT360 platform (Envoy/Trailblazer). Your mechanic did not make an error here. Issue #2, your vent actuators blew out when the battery was re-connected back up, it happens, it's common. Issue # 1 is a little more complicated. The flashing light means misfire, is a seperate issue and a coincidence. Pull the codes out with a scanner and report back, may be bad coil pack, happens and is common. Idle problem and starting to die is an easy fix, betting it only happens when the AC or defrost is on. Disconnect fuse #10 and #28 under the hood. Remove the throttle body and clean it with a sensor safe spray like Seafoam. Drive it around for the computer to relearn the newly cleaned throttle body. Idle problem will be fixed.

You're in the GMC Envoy section, but could be very similar, as I know Envoy, Jimmy, Blazer, Trailblazer are close to the same. Yes removal of the door panel is easiest. The electrical connector from the mirror should plug in at the door master switch. The mirrors typically only have 3 nuts to take off, very simple. I have cheated and not removed the door skin, just peeled the plastic back enough to get in there.