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Avalanche 1500

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Question
It will not start and the headlights and hazard lights are blinking
GM vehicles equipped with the PASS-KEY or VATS anti-theft system usually require the system be reset whenever the battery is drained or replaced. Follow this procedure. Step 1 – Attempt to start the vehicle. It will crank, but not run....
Question
Diagnose torque converter selenoid or transmission
Hi there. The computer could be putting the vehicle into limp mode due to an issue that may be happening and reduces the engine performance. Check the battery, alternator, and all of the sensors on the engine and make sure...
Question
Shaking when braking and clanking/banging noise coming from what seems to be the exhaust.
Hello, thank you for writing in. The vehicle is likely facing two different issues. While it is possible you are feeling a rough idle in the steering wheel, you may be facing a worn or dirty brake. The extra strain...
Question
possible transmission problem.
Hi there. Since the transmission fluid is a little dirty, I recommend replacing the fluid with the transmission filter. The torque converter will be working normally at all times and it will not cause the vehicle to slow down when...
Question
When power steering pump cap is removed should there be a slight presure release
You should have the power steering reservoir cap checked to make sure the vent on cap is not blocked. Also make sure the system is bled of excessive air in the system. Once these two things are checked then you...
Question
I'm getting high oil pressure readings when Accelerating
This may be happening for a a few different reasons such as a faulty oil pressure gauge in your dash, too much oil in the motor or clogged oil passages. I would start by checking the oil in the motor...
Question
I changed knock sensors on 2002 avalanche which also has after market Whipple charger .now it idles at 2000 rpm could it be the IA
Hey there: Anytime you install an aftermarket power adder (like the Whipple), it's common for tuning issues to occur. If your increased RPM happened right after replacing knock sensors, it's very possible that a vacuum line may have been removed...
Question
Ran out of gas wont start with gas
It sounds like you may have a fuel pump that is not working properly or maintaining enough fuel pressure to keep the motor running. If the engine was run completely out of fuel, there is a chance this could have...
Question
When I put my feet on gas pedal it won't go fast no more then 30
Check to see if any diagnostic trouble codes have been stored and use a real time scanner to check the response of the throttle position sensor and oxygen sensors. The throttle position sensor sends a reference voltage to your power-train...
Question
Transmission problem?
Hello, There are a number of things that can cause this to happen, most of which may be related to the transmission control module. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle...
Question
When backing up, my car makes a rocking noise.
The noise is the parking brakes are out of adjustment and the brakes are dragging. Check the rear brakes and see if they are releasing when going in reverse. If you need further assistance with your brake system, then seek...
Question
I have an 04 avalanche. I'm changing the oil pan gasket and now to the step where I remove the front crossmember. Do I need jacks
If you are attempting to complete this task on your own, I would highly recommend using the jack stands for support; as the cross-member can fall rather quickly and be difficult to hold up before both sides are removed. ...
Question
oil pressure low light came on one time for a few mins, went out hasnt came back on. what does that mean
When a low oil pressure warning is displayed, it can normally be narrowed down to one of three basic causes. An oil pressure sensor that is reading a faulty pressure, oil pressure that is actually low due to worn bearings...
Question
led bumper lights
Hi there. Thanks for writing in to YourMechanic.com. Unfortunately, we do not offer mechanical repair or service on aftermarket part installations like the LED lights you are referring. It is probably best for you to contact the manufacturer of those...
Question
Why does my truck run like crap til it is warmed up
Engines require more fuel to start and run properly when cold. If the fuel mixture is either too rich or too lean for cold running, the engine can run rough or even stall. The fuel mixture can be effected by...
Question
How important are rear sway bar links ?
Rear sway bars are to help the rear of the vehicle to be stable when driving around turns or maneuvers and when towing another vehicle. The sway bar should not affect the vehicle when hitting bumps unless the links or...
Question
I am having transmission issues in my 2006 Chevrolet Avalanche after replacing the rear main seal.
Hello. It sounds like the pins in the transmission female connector may have gotten bent when you pressed the connection back in. From the codes you are getting you are having connection issues. It is hard to see it but...
Question
Hi. I have an 04 avalanche the brake system seem to have locked up while i was driving. can u tell what it might be? its makes a l
Hi there. Your 2004 Chevrolet Avalanche should have an anti-lock braking system; which in most cases will restrict the braking to ensure this doesn't occur. However, there are some things that will restrict the ABS from working as it should...
Question
Brake abs and traction control light on lost brakes today
Hello, thank you for writing in. The traction control system and the ABS work hand in hand to help keep you on the road in slick conditions. They are both monitored heavily by the computer which makes diagnostics a lot...
Question
I have a 2003 Chevy avalanche it runs great till I turn on the headlights then it goes into limp mode
Hi There, This suggests you may have a short, a faulty connection somewhere in the main harness from the lights or potentially an issue with the charging system or battery. If the battery is weak enough, this may draw enough...

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