Skip the auto shop - Our mechanics make house calls

Q: I have an open circuit code on the fuel injector on cylinder 3.

asked by on

My car is a pontiac grand prix GTP 1999. Do you know what controls the fuel injectors?

My car has 144000 miles.
My car has an automatic transmission.

A: Hi there. From the description you have pro...

Hi there. From the description you have provided, your vehicle has an open circuit code on the #3 fuel injector, is going to require circuit testing. The fuel injector(s) are controlled by the injector driver(s) in the ECM (engine control module). Battery voltage is supplied to all of the fuel injectors and the ground side is controlled by the ECM. It could be, a poor connection or wiring problem at or to the #3 fuel injector. There is a noid light available that plugs into the connector, to check for proper signal while cranking. It could be, the #3 fuel injector coil is open.

Measuring the resistance value between the fuel injector terminals could confirm the fault. It could be, the injector driver has failed in the ECM. I recommend having your vehicle's open circuit code on the fuel injector on cylinder 3 - check engine light on be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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: Possible fuel injector leak

Hello. If you believe that a fuel injector is leaking, the vehicle should not be driven and repaired as soon as possible since fuel is flammable. You should get the aid of a mechanic to perform an inspection to determine...

Q: Improving fuel economy on an Opel

It's going to be a lot more than four dollars a gallon soon because the prices of oil got back up again. They are jeering in Texas but they are jeering everywhere else, too. Realize that, if you've got a...

Q: ABS issue on a 2002 Pontiac Bonneville SSEI

It often is on those. Those are very expensive computer-driven systems. I have a video "fixing ABS brakes on your car." Watch that. But, once you've watched that, you are going to realize that you are not going to try...

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 Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.