Q: I have a 2002 pontiac Grand Prix gt. My engine light is on and my fuel gauge always reads empty. Any idea why?

asked by on

I have a 2002 pontiac Grand Prix gt. My engine light is on and my fuel gauge always reads empty. Any idea why?

My car has 100200 miles.
My car has an automatic transmission.

The check engine light just means that diagnostic trouble codes have been stored in the car’s engine computer. These codes (and there are hundreds of possible codes) signify that the computer has detected a malfunction in the engine controls and/or the emission control system. The first thing always is to just make sure that your gas cap is secure because if loose that can actually cause the check engine light to come on. If you cap is OK, you can simply request a check engine light diagnostic and a certified mobile mechanic will come to your location and use a scanner to download the codes. The mechanic then will complete the process of testing the components that are listed as "possible trouble areas" in the downloaded codes. It’s pretty straightforward but as far as exactly what is likely to be found, that is what the exact fault is, that can’t even be guessed at until the actual codes are downloaded and read.


With regard to the gas gauge, the issue you are describing is typically caused by a defective sending unit in the tank, the wiring to the dash gauge, or the dash gauge itself. If you request a sending unit diagnostic - fuel tank the mechanic will check the whole circuit, not just the sending unit, and let you know of the required repair and cost. If you get lucky, it could be a simple low cost wiring issue. If the problem is a faulty sending unit, it’s somewhat more involved as the sending unit is actually in the fuel tank. Straightforward tests will pinpoint the faulty component though. If you request the noted services, the responding certified mechanic will get all of this resolved for you promptly. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I have a 2002 pontiac Grand Prix gt. My engine light is on and my fuel gauge always reads empty. Any idea why?

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: Engine Light is blinking, car shakes, and gas cap light is on

For the case of the gas cap leak you will need to have a smoke test and cap test done to see where the evaporative system is leaking. In order to do this will require the system put in test...

Q: Engine cutting off

This is a sign of a failing or dirty mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into...

Q: Q: Trouble starting in the morning.

Trouble starting in the morning could be a sign of worn secondary ignition components; spark plugs, wires, cap and rotor. As for the shaking and jolting the first thing I would suspect would be motor/trans mounts that have torn and...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...