20 Most Recent 2003 Pontiac Grand Am - Page 2 Questions & Answers


Why would you do 10 minute key trick ? Is the SECURITY light on steady ? Just a code reader ? Checks just Engine PCM codes ! Need a professional type scan tool to check codes in the BCM - body control module ! Don't know what and how much you know about these GM vehicles ? The ignition switch is a low voltage input to the BCM ! To determine power mode , off ,ACC , run , crank
On vehicles that have several control modules connected by serial data circuits, one module is the Power Mode Master, PMM. On this vehicle the PMM is the BCM. The PMM receives 3 discreet ignition switch signals to differentiate which power mode will be sent over the Class 2 Serial Data circuit.
To determine the correct power mode the PMM uses the following circuits:
• Ignition 0
• Ignition 1 voltage
• Ignition 3 voltage
Discrete Ignition Signals
Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid PMM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, battery positive voltage, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle . If you don't know anything about this your best bet , take it to a GM dealer . Without knowing what state the BCM is in or seeing from the ignition switch or if DTC'S - diagnostic trouble codes are stored , can't give you any sound advice . Would only be guessing !

2003 Pontiac... | Answered on May 31, 2017


If you have 100,000 miles or close to it you needed or would need a fuel pump anyway.Your mechanic sounds like a knowledgeable skilled honest one, he didn't even charge you for some items.
Stick with him/her as you both will get all the problems solved.
The work he has done is smart logical work so far.
Next time it does not start right away,keep cranking the engine to get the oil pressure up.If it starts when the oil pressure builds it may be you are not getting a prime cycle when you first turn on the key some times.

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


You most likely need a new low beam headlight BULB.It has the low and high beam in it and the separate high beam has only high.
You SHOULD have 2 tabs ,one at each end to pull up and the headlight assembly should then come out easily.
Tapping a blown out headlight can reattach the filament for a short time but after that replacement is necessary.

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


Did you try Head gasket fix I had 99 3.4 works well?

2003 Pontiac... | Answered on May 15, 2017


I assume the symptoms are a low brake pedal? If so the master cylinder may be defective.

2003 Pontiac... | Answered on Mar 17, 2017


Get a definite diagnosis. It could be many things but it sounds like the trans is starting to show signs of wear. If its still under warr. take it back ASAP

2003 Pontiac... | Answered on Mar 14, 2017


Try a mechanical grabber, which is a flexible cable with a push-button on one end, and grabber-claws on the other end.

2003 Pontiac... | Answered on Feb 16, 2017


dex merc ????? Dex-cool ! dex-cool antifreeze is made for GM vehicle's . mixing with any other coolant , will cause problems . Plugging up the cooling system for starters .

2003 Pontiac... | Answered on Feb 08, 2017


I just replaced the blower motor and resistor in my daughters 02 Grand Am 3.4l. Not sure if it's a total fix but it's a start to the elimination process and only cost $40 for both parts. Will repost if it's not solved. Hope this helps someone in the meantime looking for answers.

2003 Pontiac... | Answered on Oct 16, 2016


check fuses and relays --also test climate control switch and fan /fan module but check fuses and relays first

2003 Pontiac... | Answered on Sep 29, 2016


Hi Will,here's a video on your flashers. Pontiac Grand Am turn signal fix repair

2003 Pontiac... | Answered on Sep 21, 2016


run the fault codes
could be a TCM but more likely a servo/ solenoid for the gear
I would say that the car is running so ignition module will not be in the equation

2003 Pontiac... | Answered on Sep 18, 2016


Common problem with that motor is the intake gaskets fail. It could be that but in reality it sounds like head gaskets are gone

2003 Pontiac... | Answered on Aug 19, 2016

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