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.

A: Hello. Though there are a lot of common iss...

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・Save up to 30%

Get a quote

What others are asking

Q: Delay in shifting, rambling noise when accelerating

Various items can cause similar symptoms to the ones you have described. The most common would be a bad fuel filter, transmission fault, torque converter issue, shift solenoid problem, low fuel pressure, or a failed fuel injector. All of these...

Q: What is wrong with my transmission? 1968 Chevy Impala

Hi there. It sounds like the transmission forward clutch plates are slipping. First check the fluid level and fluid condition by putting the dipstick fluid on a clean white towel and seeing if you see what looks like sand in...

Q: Check Engine Light came on. Car also has problems cranking but only when I refill it with gas.

Hi there - the first thing to do is extract the problem code(s) which are setting the "Check Engine" light. This will more efficiently direct resolution of the problem. Evaporative emission system problems are often associated with "fill-up" issues like...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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.