Skip the auto shop - Our mechanics make house calls

Q: Gauges fluctuate wildly then car turns off.

asked by on

I've been having this issue for the past few months where the gauges in my car begin to fluctuate wildly, rpm, speed, fuel all start changing within the span of a few seconds they go from min to max while driving. The battery light turns on then the car turns off. This happens once the car has been on for a period of time which can vary from a few minutes to about an hour. I have replaced the battery and checked all of the grounds in the system to make sure they are wrench tight. I have also replaced the idle control valve since the car sometimes accelerates and decelerates on its own while idleing thought this did not fix the issue. Recently i tried taking it to a mechanic to connect to the onboad diagnostics tool and i have error messages for tps circuit low voltage (P0122) which i replaced, fuel level sensor circuit low voltage (P0462), TPS sensor circuit intermittent low voltage (P1122). I am at the end of my rope changing sensors and testing the different leads of the PCM.

My car has 48000 miles.
My car has an automatic transmission.

Hello. Though there are a lot of common issues that can cause this, the most common is a voltage issue. Low voltage will cause each of these symptoms and codes you are getting. I usually start by testing the ignition switch. It is the most common failure to cause this. The switch fails internally and causes these circuits to act up. If for some reason the ignition switch is not the issue then it may be a problem with the body control module or an internal short in the fuse box. If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose this.

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: It's going 20 miles per hour in 3rd gear. The car was in reverse and wouldn't move but it will accelerate.

Hi there. The transmission is in limp mode to only go in 3rd gear. The reverse not working and then all of a sudden it works, but will not accelerate past 20 mph, then either the transmission is slipping or...

Q: Price alternator and installed

If the engine does not turn over, I would recommend checking all connections related to the battery and check to be sure the starter relay is producing power to the starter. The starter relay directs power from the battery to...

Q: My car just shut off while driving nd wont start bsk up dosent even crank over nothing at all turns on

Without additional detail, this would be tough to diagnose, however the fact that it just shut down out of nowhere as you've described suggests that some kind of sensor or relay may have triggered this. I would suggest having an...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.