Q: Door locks on and off on and speedometer dial fluctuates

asked by on July 30, 2016

While driving several things start happening randomly: my door locks go on and off and the air-conditioning blows but it's warm air no longer cool and the speed on what are dial goes to zero even though I'm going 60 miles an hour and the first gear won't easily shift in the second. My dealer says it needs a new battery cable at a cost of $850. Do you think that is the real solution and is that a fair price?

My car has 170000 miles.
My car has an automatic transmission.

I would question the diagnosis for the dealer to show you the reason to get the cable replaced and why the cable is so expensive. Have them break down the parts and labor in the quote. I show about an hour of labor each for the positive and negative cables plus the price of the cable for your Avalanche.

There could be possible issues with wire harness chafing by the parking brake. Also you may have problems with fretting corrosion at the different modules throughout the vehicle that require each module to be disconnected and have dielectric lube applied on them to stop the intermittent connection issues.

If you’d like a second opinion on this, consider YourMechanic, as a certified technician can diagnose the issues with your electrical components and help you fix them accordingly. Good luck.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Hej, min windstar 1996 går bra med kall motor när motorn är varm så stannar den när jag lågger i växel ,sen startar den bara med fullgas å går dåligt

Hi today I replaced the radiator in my 2013 Nissan Murano and forgot to hook up the transmission line started it and it leaked all over hooked it up afterwards and am wondering what I should do

Would a leaking valve cover gasket cause a misfire?

A leaking valve cover gasket can cause a misfire if oil is leaking into the spark plug wells. But that is usually not the problem. Most often the misfire will have a separate cause. But a leaking valve cover can...

where can i find AT solenoid for Acura 2017 tlx without buying a valve body

Transmission shift solenoids are installed by certified mechanics dispatched by YourMechanic right to your location. If you desire that service, please use YourMechanic's service request page for solenoid replacement. If you are inquiring about the general availability of solenoids for...

Ticking sound

Hi There, This kind of ticking sound is usually related to valve train noise that is caused by the lack of oil circulation or out of adjustment valve train components. This is somewhat common to a certain extent when the...

300,000 miles too much for a Cummins?

Hello there. Any mechanic that knows diesel engines would tell you that without inspecting the vehicle onsite, it's nearly impossible to give you an estimate on how long this engine would last. I've seen some Cummins diesel engines have difficulty...

Car won't start. Got a new battery. Still won't start. Lights came on once I turned ignition everything died out.

A dead alternator will not prevent the engine from starting. As long as the car battery is FULLY charged and not defective, the battery alone provides all of the power required for ignition and starting. However, a dead alternator will,...

Battery light and check engine light on

Hi there, thanks for writing in. I'm happy to help. The battery light will come on if the charging system and battery voltage drops below a minimum set by the factory. The check engine light is letting you know that...

How do I disengage the parking brake?

Before driving, you should always disengage the parking brake. If you attempt to drive with the parking brake on, you can do serious damage to your brake system. To disengage the parking brake, press the Release button at the end...

Related articles

2012 Toyota Tundra vs. 2012 Chevrolet Silverado: Which One Should I Buy?
Large work trucks are meant for one thing: work! These vehicles are rough and ready, and can handle nearly anything you throw at them, with the exception of a car pool. While they offer two or four door options, you...
Industry News for Automotive Techs: October 8-14
50 MPG Chevrolet Cruz Diesel, Mazda's G-Vectoring drive system, Uber and Volvo collaborate on autonomous cars, and Hubb's new reusable oil filter.
Symptoms of a Bad or Failing Door Latch
If a car door will not stay closed, must be slammed hard to close, or gets stuck and will not open, you may need to replace the door latch.