20 Most Recent 2008 Pontiac G5 Questions & Answers


Your dealer is full of it and you should stop using that AH. Get yourself another dealer that is competent and worthy of your business. No car should operate the way yours is.

You appear to have either a fuel delivery problem or an erratic ignition causing the issue.

2008 Pontiac G5 | Answered on Mar 24, 2017


On this website (link below) you find fuse box diagram and description for Pontiac G5 (2008)


Pontiac G5 2008 fuse box diagram Auto Genius

2008 Pontiac G5 | Answered on Feb 20, 2017


To fix your problem Fix what they ripped out first. You can get the key/lockset and ignition switch at parts stores. Fix wiring also if needed. After it is back to normal. Do a relearn for the key. Put a battery charger on the battery( you don't want it to go below 8 volts). Turn the key on for ten minutes, off for thirty seconds. Three times. Then try to start. If the voltage gets to low or you hit the starter at any time, you have to start over. This will reprogram passlock III keys to the security.

2008 Pontiac G5 | Answered on Dec 06, 2016


If there's not a button on your shifter then it has to be your electronic shifter sensor on Transmission

2008 Pontiac G5 | Answered on Apr 24, 2016


This is easy. Get a friend, you need a little help. grab hold of the bottom seat by slipping your hands in the crease. Lift it up. The seat will lift up towards you. There are some clips on the bottom. of the seat, slide the seat off the clips and take the seat out of the car. Most backs have bolts holding the back in place. Undo the bolts, and lift the seat off the top clips,, and remove from the car. Goes back the way it came out.

2008 Pontiac G5 | Answered on Apr 03, 2016


Engine must be running to check the fluid level. Transmission should be hot, not cold. Then remove plug. Add transmission fluid until it comes out of plug hole. If the engine is not running and you remove the plug, you will lose a lot of transmission fluid.

2008 Pontiac G5 | Answered on Oct 17, 2015


PO128 is code for Coolant temp is below thermostat regulating temp. Sounds that either the thermostat is missing or stuck open.

Hope this helps

2008 Pontiac G5 | Answered on Jun 02, 2015


You may need to go to a GM dealer. Their computers are a little more accurate than most mechanics. They are also familiar with your car and may have seen it before.

2008 Pontiac G5 | Answered on Apr 25, 2015


Motor oil removes heat away from the moving parts. Without motor oil, the engine gets no lubrication of moving parts and it over heats severely. Then moving parts expand in size and will seize up permanently. Your engine will have to be taken apart to see what parts were damaged. This could cost well over a thousand dollars or much more to get fixed.

2008 Pontiac G5 | Answered on Apr 05, 2015


you say everything works on the road but it just won`t start, so I am guessing you have had it run okay after the timing chain was installed. there fore it could be an ignition or fuel supply problem when trying to start. check for both to see which it is. if you have anti-theft on the car it may have activated, there will be a red light on the dash flashing while trying to start.

2008 Pontiac G5 | Answered on Mar 11, 2015


How is it at idle? A fast idle might be the result of a vacuum leak. Is there a check engine light with a code? Did you clean the mass air flow sensor?

2008 Pontiac G5 | Answered on Mar 01, 2015


it is #11 in the graphic below:
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2008 Pontiac G5 | Answered on Feb 25, 2015


I am having same problem with 2008 g5 , no radio , no alert sounds does anyone know what is the problem

2008 Pontiac G5 | Answered on Feb 15, 2015


The air pressure in one of your tires is bad or the valve stem/sensor needs replaced. Hope this helps.

2008 Pontiac G5 | Answered on Feb 04, 2015

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