20 Most Recent 2003 Pontiac Grand Prix Questions & Answers

Go to Alldatadiy.com for wiring schematics.

2003 Pontiac... | Answered on Jan 11, 2018

Somewhere a poor connection is the cause. The year model indicates that some miles might be on the car.
Open the bonnet?hood and inspect for a bad joint or some wire that is rubbing against the body.
I will buy some electrical switch cleaner and spray the connectors. Just remember to let the connection dry before trying again, you don't want to short and blow something.

2003 Pontiac... | Answered on Sep 30, 2017

You would need to buy a factory service manual for that blend door diagram. Try eBay for a used manual set.

2003 Pontiac... | Answered on Aug 22, 2017

The speed sensor wiring may be bad . The ECM/PCM can go bad and a used one can be found though some need reprogramming.

2003 Pontiac... | Answered on Aug 21, 2017

What is hesitating - the engine or the transmission?

When starting the car and putting it in gear, if the transmission shifts immediately into first gear and then shifts smoothly from first to second gear, I doubt its a transmission problem. However, if that isn't the case, you will probably need a new or rebuilt transmission ($1500+).

Engine hesitation can be due to a lot of things related to the fuel system that won't necessarily show up on a code reader - for example, dirty throttle body, fouled IAC (idle air control) motor, fouled EGR valve, etc.

2003 Pontiac... | Answered on Jul 01, 2017

sensor 2 is the oxygen sensor and is after the cat converter
sensor 1 is a heated oxygen sensor and is in the exhaust manifold or before the cat converter
two completely different sensors

2003 Pontiac... | Answered on Sep 25, 2016

Without amp rating on charger let's move on to other items to look at.
Are the connections to battery tight and clean. Make sure you have cleaned both posts. Make sure there is no corrosion on cable ends. Also look at the wire that runs to ground , insure that is clean as well. Reconnect battery!
Turn off all accessories (radio, heater, A/C). When you open doors does the dome light turn on.
Does the dome light dim as you crank / click.
Can the car be jump started? If yes then I would lean to a weak battery. Without test equipment ( voltmeter) tough to varify.
You didn't explain why you replaced battery, but a purchased battery usually will normally be enough.
Make sure the battery size (amp hours) is rated for your engine size.
make sure wires to your starter are also corrosion free. A bad ground won't allow enough current flow giving you the click no crank.
try turning the key on off rapidly thus making starter move slightly and if it starts you are probably in need of new starter. The starter relay is easy to replace and cheaper so you can start there.

2003 Pontiac... | Answered on Sep 23, 2016

You need to do a fault code test, any Autozone or Oreilly parts store will test it for free. DO NOT BUY ANY PARTS BASED ON WHAT A PARTS PERSON SUGGESTS, they are not trained technicians and will just cost you money and frustration.

2003 Pontiac... | Answered on Jun 04, 2016

Usually a humming noise ( will get louder the faster you go ) is associated with a worn/bad wheel bearing. If the bearing is worn bad enough, it can also produce a wobble. Have the bearings checked on the side/wheel the problem is coming from

2003 Pontiac... | Answered on Jan 15, 2016

I always go to the auto wreckers - you should be able to pick the parts you need for really cheap.

2003 Pontiac... | Answered on Dec 31, 2015

Check the fuses first
Or could b the motors for your windows

2003 Pontiac... | Answered on Nov 10, 2015

Not finding what you are looking for?
2003 Pontiac Grand Prix Logo

692 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

Top Pontiac Experts


Level 3 Expert

85239 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8984 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Grand Prix Pontiac

  • Grand Prix Pontiac

Most Popular Question

03 gran prix dies while idle or driving

  • Cars & Trucks