20 Most Recent 2005 Pontiac Grand Am Questions & Answers

Hello Monica,

Attached find your Transmission/Tansaxle - Tranmission Controls -
for your 2005 Grand Am 3.4

2005 grand am.schematic_page_1-1irkglzretly5bigryw4zx22-3-0.jpg

2005 grand am.schematic_page_2-1irkglzretly5bigryw4zx22-3-1.jpg

2005 grand am.schematic_page_3-1irkglzretly5bigryw4zx22-3-3.jpg

2005 Pontiac... | Answered on Sep 03, 2017

Hello Michael,

Typically PCM's are rather robust components that are not as prone to failure as sensors are. Some automotive electronic components can fail under heat stress and work fine after they have cooled down...like an ignition control module.

As you are experiencing your problem while engaging the ignition switch (which you described as sometimes hanging up) I would start your trouble shooting with the ignition switch itself.

  • Ignition starter switch directs current from the fuse panel to other systems in the vehicle
  • When not replaced, vehicle may experience no-start, intermittent shut down and/or current will not flow to all systems.
Your vehicle also has steering column lock actuator you will have to deal with when removing the ignition switch for replacement which is rated as "easy"

Search Results for 2005 Pontiac Gand Am ignition switch

2005 Pontiac... | Answered on Sep 03, 2017

Power to many of this vehicle's circuits are controlled by the module that is designated the Power Mode Master (PMM). This vehicle's PMM is the Body Control Module (BCM). The PMM controls which power mode (Run, Accessory, Crank, or Off) is active.
Serial Data Power Mode
On vehicles that have several control modules connected by serial data circuits, one module is the Power Mode Master (PMM). The BCM is the PMM on this vehicle. The PMM receives 3 discrete 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
• Ignition 3

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 volts, 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.
Do you know what class 2 is ?

Class 2 Serial Data Link
The following modules use the class 2 serial data link to communicate with each other:
• The body control module (BCM)
• The digital radio receiver (DRR)
• The electronic brake control module (EBCM)
• The inflatable restraint sensing and diagnostic module (SDM)
• The powertrain control module (PCM)
• The radio
• The vehicle theft deterrent (VTD)
The class 2 serial data link also allows a scan tool to communicate with the above modules for diagnostic and testing purposes.
The class 2 serial data link on this vehicle is configured in a star pattern. There is no redundant path for the serial data to flow through. If a class 2 serial data circuit develops an open condition, the module connected by that circuit will not be able to communicate.

It is an electronic starter. ????? No it's not ! View a starter circuit here at http://www.bbbind.com/free_tsb.html Enter vehicle info. under system click on engine ,then under sub system click starting .

2005 Pontiac... | Answered on Apr 19, 2017

No dash lights? no warning lights? Then ignition is not being turned to ON. Check all your fuses. Recheck your replacement work. Battery cables clean and tight? Headlights work? If lights are bright, battery is good and cables are good, so key to ON should light up warning lights on dash. If not something up still with your ignition switch.

2005 Pontiac... | Answered on Apr 05, 2017

You have more than one. The 7x sensor is on back side of engine block, down low. two wire connector.


2005 Pontiac... | Answered on Mar 26, 2017

On this website you find fuse box diagram and description for Pontiac Grand Am (2005)


2005 Pontiac... | Answered on Mar 05, 2017

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

2005 Pontiac... | Answered on Oct 04, 2016

You may want to check the MAF "mass air flow" sensor, and clean the throttle body. If the computer thinks there is the wrong amount of air entering the system, it will compensate by adjusting the fuel.

2005 Pontiac... | Answered on Sep 07, 2016

The smell can seep into your ac vemts

2005 Pontiac... | Answered on Jun 26, 2016

Yes that is exactly what it is for But
With the car cold open the radiator cap and make sure it is full then replace and check that reservoir is full to the cold fill line.

Hope this helps Mike

2005 Pontiac... | Answered on Feb 13, 2016

no it should not effect the compressor

2005 Pontiac... | Answered on Feb 13, 2016

Big hose from the top of the radiator, follow it back to the engine block. look for a fitting there.

2005 Pontiac... | Answered on Jan 13, 2016

Starting how ? Does the engine spin when you turn the key to the start position ? Or it doesn't do anything ? Is there a SECURITY light lit on the dash ?

2005 Pontiac... | Answered on Jan 12, 2016

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