Q: My 2004 Tahoe warning light says REDUCED POWER. IT'S really cold out, had to be boosted when the warning appeared.

asked by on January 02, 2018

I went to start my 2004 Tahoe in 11 degree weather, had to be boosted off. When I was able to start the Tahoe warning light says REDUCED POWER lit up. Transmission was great when I last drove it 2 days ago.... I'm hoping it's a cold start , battery.. you know something simple. Haha! Any suggestions would be greatly appreciated, and I thank you for the help.

My car has 210000 miles.
My car has an automatic transmission.

Warning Light is on Inspection $79.99 - $89.99 Get a Quote
Battery Replacement $200.97 - $319.07 Get a Quote

There will be stored trouble codes that need to be read and cleared. With any luck, that will be all there is to it. When you try to start a car with a dead battery, it really confuses the electronics because the system voltage drops so much. The result will often be a lot of false trouble codes and warning lights. If the codes come back after being cleared, that’s another story. Contact YourMechanic to have a technician come out to your home or office to read and interpret you trouble codes for you. At the same time you should get your battery replaced. Boosting your car can do damage to the car electrical systems.

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

What others are asking

Engine fan continues to run, Check Engine light on, and coolant leaks.

The two engine fans are controlled by separate relays that are turned on by a powertrain control unit. The system is controlled through the body control module that signals the powertrain control unit. The body control module gets signals from...

No oil but light didn't come on or stay on

Hello there, oil lights can be slow to respond to for a lack of oil in your 2004 BMW 320i. 10 liters of oil is excessive oil consumption. Excessive oil consumption is a problem and can damage your engine if...

what sends signal to a TPS sensor

Hello, thank you for writing in. The throttle position sensor does not take inputs from anything, but instead it acts as an input to the ECU (the main computer). The ECU then uses it for engine performance. The sensor's resistance...

No power steering in Proton Saga

Here's the thing--power steering fluid is what gives you power. The pump pumps it, sends the power to the rack, which makes it easy to turn. If it all leaked out and you drive it, it will burn the power...

Hit a curb, bent the axle?

Although the CV axle on the side that was hit, particularly the CV joints, could have been damaged in the collision, the damage you are seeing is more likely due to the control arm, strut, and steering knuckle getting pushed...

Spark plugs/Coil plugs wont spark and car will no longer start because of this.

The mention of the camshaft position code and the car's mileage make me think of a timing belt problem. If you can see the camshaft you might want to check and see if it is turning while the car cranks....

The Service AdvanceTrac and power steering lights came on after I got in an accident

These warning messages are displayed when the computer detects an issue with the AdvanceTrac and power steering systems. It may be possible that damage occurred within these systems when the vehicle was involved in the accident. The AdvanceTrac system is...

Transmission codes 0122 and 2201, engine codes p0122 tps and p1122 tps what do they mean and what do I need to do or change?

Hi There, These codes relate to the following and are likely related: -Code P0122 - low voltage detected from the throttle position sensor. -Code P1122 - intermittent voltage from the throttle position sensor. These codes are not likely related...

The VSA light came on on my Honda Accord

There is a "connection." When you drained the battery, the PCM and possibly the electronically controlled VSA components themselves "saw" an out of range low voltage, even if momentarily. Such will cause a trouble code to set and illuminate the...

Related articles

The Best Used Cars to Buy If You're a General Contractor
If If you're a general contractor, you probably aren’t in the market for a used car. More likely, you’re looking for a pickup truck, because you need to haul equipment and supplies to various job sites. Most contractors will likely...
The Best Used Cars to Buy If You're a Dog Trainer
If If you are a dog trainer, you expect a lot from your vehicle. You want a ride that is safe, roomy, and of course, dog friendly, since your training operation will often mean that you need to transport the...
The Best Used Cars to Buy If You're a Carpenter
If If you're a carpenter, and working for someone else, the best used car is whatever you like that gets you to work on time and holds your tools – in short, practically any used car will do. If you...