Skip the auto shop - Our mechanics make house calls

Q: ABS Light on, speedometer not responding, and air conditiong shuts down

asked by on

My car's rpm niddles jumps up and down, then the ABS and brake lights come on dashboard and then the air condition stops cooling as well. Sometimes the temperature niddles jumps as well and the speedometer doesn't respond and the gear signal on the dash board blinks as well.
My car has an automatic transmission.

A: Hello. Since you are receiving multiple war...

Hello. Since you are receiving multiple warning lights, you will want to start by having the vehicle scanned for diagnostic troubleshooting codes. This will give you some insight to the issues the computer has already detected, and will make diagnosis much easier. You can have this done by a technician, or at most local auto parts stores. You are likely having more than one problem at the same time.

The rough idle issue is often related to fuel and spark issues. This is likely the worst issue. While the air conditioning is a separate system. The gear indicator light on the dashboard is its own system as well. The only common factor between these systems is the power supply (or battery). You may want to make sure your alternator is keeping your battery fully charged. If you would like to have this checked, a certified technician from YourMechanic can come to your car’s location to diagnose the warning lights and proceed with needed repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Get a quote

What others are asking

Q: Transmission in safe mode

It could be that the speed sensor is bad. The transmission will go into limp or safe mode when it loses one of its main inputs, such as the transmission speed or transmission range sensor. It may also go into...

Q: My ABS is making a lot of noise in my GMC Yukon 2002.

Before spending the extra money on replacing the modules for the ABS and traction control, you may want to have the wheel sensors checked first as these are commonly known to either fail or become disrupted causing theses systems to...

Q: How Does a Car's Rear Defroster Work?

Most vehicles have an electrical grid on the rear window that will warm the glass to clear fogging or frost. The rear defroster grid is applied to the inside of the glass by the manufacturer and actually conducts electrical current...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.