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G5

You cannot have a used ECM installed since it was programmed to old car. You will need to have a new or remanufactured one and have it programmed to work for your car and theft system. If the battery got...

Your check engine light (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) may come on for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter, bad spark plugs or wires and many other reasons. Unfortunately due to...

Hi Destiny. When the AC is turned on or your vehicle is activating a "cooling mode", the engine undergoes a tremendous amount of load. When this occurs, existing problems that can be hidden in most cases will accelerate and cause...

Hello Sharon, thanks for writing in. The power steering can and absolutely will go out if the alternator or battery fails while driving. Lets break it down. The alternator is powered off of the engine, and it then supplies the...

The power steering pump may be low on fluid causing the system to work hard like the vehicle had no power steering. Check the fluid for the correct level. If the power steering fluid is full, then the pump or...

It sounds like the oil pan ruptured or tore from an impact. The crankshaft is above the pan and probably is not damaged however there is an oil pick up tube and screen assembly in the lower oil pan area...

Hi there. If the engine is shaking and the reduced engine power is displayed, then you need to check the engine for a misfire. Check the fuel injectors for if the are working properly. Disconnect the harness one at a...

Hi, from what you’ve described and the nature of the two codes, it sounds like a timing problem. It’s possible that the timing chain has stretched, the timing chain tensioner needs to be replaced, a timing chain guide has slipped...

Hello. From what you describe it would appear that some sort of serious issue may have occurred that is greatly affecting engine performance. A few common reasons why a car would not want to go over 45 mph is due...

Hello there. It sounds like you have a few things going on. If there is no power to the DLC connector, then the code readers are not able to read codes stored in the ECU. The most common cause of...

The throttle position sensor (https://www.yourmechanic.com/parts/throttle-position-sensor) is a very common part on most cars, however it is specific to your vehicle's engine application. This is something that ca be purchased at most local auto parts stores (i.e. Autozone, Oreily's, etc.) relatively...

This is a known issue with the Pontiac G5 and can be caused by a couple of different possibilities. One possibility is related to the transmission shift lock assembly or position indicator sensor (https://www.yourmechanic.com/services/transmission-position-sensor-switch-replacement) which is what prevents the key...

Hi there. In general, when an engine just 'clicks' when you turn the key, it's due to an electrical relay that is damaged, battery or battery cables that are worn out or broken or a broken fuse. Any or many...

Hi there. The forward clutch seems to be not applying in the transmission. The forward clutch drives all of the forward gears in the transmission. The forward clutch could be slipping, the seals on the forward clutch could be damaged,...

The purge valve on the engine is not supposed to flow fuel tank vapors from the carbon canister when the vehicle is off or at idle. When refueling the vehicle a lot of fumes are generated in the tank and...

Hello there, the traction control system is an important safety feature of your 2007 Pontiac G5. When the traction control light is on this means there is a fault that prevents normal operation of your traction control system. The problem...

Hi there. Based on what you've described, it seems like you may have either a combination meter issue or a loose/corroded connector/ground. Loose/corroded connectors can make some of the things in your vehicle behave erratic just as you mentioned. Make...

Hi, thanks for writing in. This should not affect the functionality of the O2 sensors, as long as the replacement sensor is in fact the correct part for your application. If your car continues to produce fault codes, consider having...

Hello, thanks for writing in about your Pontiac G5. From what you've described you have a fuel pump that is causing the short intermittently. The connection to the to the fuel pump should be also replaced along with the pump...

Hello there. The cooling fan running when the vehicle is shut off for this vehicle is fairly common. In some cases the cooling fan will run when the vehicle is turned off to continue to cool it down for a...