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Envoy

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Question
If you replace both engine and transmission and still have reduced engine power, what do you do
The first thing to do is to have the computer system scanned and codes logged. Then clear the codes and road test to see if problem and check engine light returns. If it does then retest the system for codes...
Question
My car won't turn nor will it accelerate.
Hi there. The transmission position sensor is malfunctioning and needs replaced. The transmission position sensor tells the computer (ECM) what gear the transmission is in. If you need further assistance with your vehicle not starting, then seek out a professional,...
Question
2002 GMC Envoy message displayed on message board, turn engine off now. What does this mean?
Hi there. The message could have came on for something that may have been active on the engine or transmission. If the light comes on again, then the computer (ECM) should store the events and you could have them read...
Question
MY GMC ENVOY 2007 CAR IS CREATING A NOISE ESPECIALLY ON BUMPY RODAS.SOUND IS COMING FROM DRIVING SEAT TIRE SIDE AND ONLY ON BUMPY
Hello, thank you for writing in. The best option is to recreate the noise and pinpoint where it is coming from. You can do a bounce test to test the suspension components. Go to each bumper and press down on...
Question
Reduced engine power on GMC Envoy 2003
The issue you are writing in about is common enough that a specific diagnostic, namely a Reduced Engine Power Warning Light Diagnostic is performed by technicians dispatched by YourMechanic. If you request that diagnostic, the responding certified mechanic will get...
Question
I have a leak in one of the hoses or fittings. Estimate on service
Hi there. It sounds like there may be more than just a fitting or hose leaking. This definitely needs to have an inspection performed to determine the extent of the leaks and what truly needs to be replaced. I suggest...
Question
Battery light was on and now car won't start and keys stuck in ignition
Hi there. It more than likely that you are experiencing an issue with the alternator or the main relay as opposed to the battery itself. Once your car starts, power to all components and accessories is provided by the alternator;...
Question
Transmission
It is possible that the shift cable that goes from your shifter handle to the transmission itself has broken. This would cause the transmission to be perminantly stuck in park and would likely be a simple and inexpensive fix. I...
Question
I took my 04 GMC Envoy to better brakes for less as I needed to have it pass smog and the check engine light was on. They said I n
Inasmuch as YourMechanic is mobile, you need not bring the car anywhere as the certified mechanic will come to you and take care of the radiator replacement. If you desire mobile replacement, please simply use YourMechanic's radiator replacement service page....
Question
my car is almost dying and at 40mph wont go over 2000rpms sometimes under that.
Hi there. After reviewing your question, it is quite possible that you have an oil circulation or lubrication problem; possibly caused by an obstruction in the oil lines, faulty oil pump or too much debris (sludge) in the motor. When...
Question
Fuel smell and poor fuel economy
Hello, There are a number of things that can cause the fuel smell and poor fuel mileage as you describe. I would start with checking the mass air flow sensor as this is a common component that can become dirty...
Question
Heater controls not working
Hello, thank you for writing in. There are multiple fuse boxes associated with the vehicle, and you may also need to check the interior fuse box. Fuse number 13 according to my records is for the rear climate control, and...
Question
Sometimes key starts now it doesn't. Ignition or solenoid, please help 2005 GMC Envoy
Hi there - it sounds like you have been "jumping" the starter off using a screwdriver to short the power cable from the battery to the starter motor terminal - bypassing the starter solenoid. That would have indicated a bad...
Question
Check Engine Light is on
Hello, There are a number of reasons why the check engine light may come on related to the fuel injection system. Generally, the check engine light comes on when something fairly serious is going on with the vehicle. This can...
Question
I have a 2006 GMC Envoy. Makes a race car engine sound and the RPM goes high in 1st, 2nd and 3rd gear.
What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...
Question
My check engine light came on then turned off and it just keeps doing that.
Generally, the check engine light comes on when something fairly serious is going on with the vehicle. This can happen for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter,...
Question
Why the theft signal keeps on
Hi there. More often than not, this problem is caused by a stored error code inside the ECU that keeps the security light illuminated. If you recently replaced a battery or other primary electrical component, this may have triggered the...
Question
On highway,didn't know 4 hi was stuck on, weird smell, looked like gear oil or oil was leaking pretty good, seemed to stop in 2wd
Hello, thank you for writing in. Your vehicle is typically rear wheel drive, when you have it in 4-Hi then you are telling the front wheels to engage with the transmission. The fluid is then pressurized and the gears mesh...
Question
My truck will start sometimes and other times it won't.
In this situation, especially after the note about the fuel level no changing, I would have the fuel pressure checked first to make sure the fuel pump is actually sending fuel to the engine on the times it will not...
Question
How do you remove the torque converter bolts off the flywheel? 2005 GMC Envoy Denali
Hello - with the vehicle safely supported to provide clearance underneath - in between the engine oil and transmission pan, there is a large, funnel-shaped aluminum casting (called the bellhousing), that physically mounts the engine to the transmission. At the...

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