20 Most Recent 2004 Pontiac Sunfire Questions & Answers


I'm fairly certain that the ect sensor has to be replaced ??? Did you test ? If your not 100% sure from testing , your best bet would be to take it to a qualified repair shop . Do you like buying parts without knowing that's the problem for sure ? Making part stores rich .

2004 Pontiac... | Answered on Jan 31, 2018


Automatic Transmission Shift Lock Control Description and Operation
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of thew following components:
• The automatic transmission shift lock control solenoid
• The body control module (BCM)
• The powertrain control module (PCM)
With the ignition in the ON position, battery positive voltage is supplied to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid receives a ground from the BCM. When the automatic transmission shift lock control solenoid is energized, the shift lever mechanically locked in the PARK position. When the driver presses the brake pedal the PCM sends a class 2 serial data message to the BCM. The BCM turns OFF the ground control circuit and this de-energizes the automatic transmission shift lock control solenoid. When the automatic transmission shift lock control solenoid is de-energized, the shift lever may be moved out of the PARK position. The BCM determines transaxle shift lever position through a class 2 serial data message from the PCM. The PCM receives inputs from the park/neutral position switch and determines shift lever position. When the BCM receives this information and determines that the shift lever is out of the PARK position, the automatic transmission shift lock control solenoid ground is opened.

Do you know what a DTC is ? Diagnostic trouble code !

DTC B2708
The body control module (BCM) controls the automatic transmission shift lock control solenoid. Positive voltage is supplied via the ignition 1 voltage circuit to the automatic transmission shift lock control solenoid. The BCM controls the ground circuit of the automatic transmission shift lock control solenoid . When the brake pedal is depressed, the BCM removes the ground allowing the solenoid to disengage. This action allows the vehicle to be shifted out of the PARK position.
Conditions for Running the DTC
DTC B2707

Your best bet mite be to have a qualified repair shop check it .

2004 Pontiac... | Answered on Jan 15, 2018


Smoke test the system . P0442 small leak .
This DTC tests the evaporative emission (EVAP) system for a small leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the vacuum decay rate. At an appropriate time, the control module turns the EVAP canister purge solenoid valve ON and the EVAP vent solenoid valve ON. This allows the engine to draw a vacuum on the EVAP system. At a calibrated time, or vacuum level, the control module turns the EVAP canister purge solenoid valve OFF, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum decay. If the control module detects a leak larger than a calibrated amount, this DTC sets.
EVAP Leaks P0442 and P0455

2004 Pontiac... | Answered on Aug 09, 2017


From 2003 to 2006 GM - chevy , pontiac , buick , cadillac , had bad step motors inside the instrument clusters , causing gauges to no work or sporadically . Happened to my 2005 chevy cavalier , went to automotive salvage yard ,got a used one for $20.00 buck's . That was two year's ago , now problems !
How to repair GM Instrument Cluster Speedometer Gauge Stepper
Or you can buy the up graded stepper motors on eBay an fix it .

2004 Pontiac... | Answered on May 24, 2017


The transmission dipstick should be on the passenger side marked red or yellow and just by the firewall. Hope this helps.

2004 Pontiac... | Answered on May 19, 2017


Not sure on your model but maybe a relay clicking in and out on top of the heater. That is about all there is there.

2004 Pontiac... | Answered on May 17, 2017


I'd want to check voltage and ground for fuel pump relay. The load side of relay is the line with arrowhead, when relay is energized that line with arrowhead moves to other terminal and sends voltage to fuel pump on gray wire. The control side of relay is that coil symbol, it has to have voltage and ground, the voltage comes from pcm, the ground is a chassis ground. The voltage for load side of relay is fuse protected, fp/inj fuse. fuel pump-mo2osvehtzbwzhstuaetpz2s-2-0.jpg

2004 Pontiac... | Answered on May 12, 2017


I had the same issue!! it is the security system failing. I took it to the shop and they wanted a ridiculous amount of money to fix it.. So i did a ton of research and i found a part you can install yourself that will bypass it allowing your car to start every time... I did mine 5 years ago and i havent had an issue since. Check out the site your car in on the list year make and model.. They are friendly and have great customer service and for some reason if it doesnt work they will refund you 100% hope this helps ya out
http://vatspasslockpasskeysecurityhelp.com/ Do It Yourself GM Security bypass

2004 Pontiac... | Answered on Apr 05, 2017


Your instrument cluster is failing, you need to remove it and have it rebuilt.

2004 Pontiac... | Answered on Mar 25, 2017


I would take the offer to repair.

2004 Pontiac... | Answered on Mar 02, 2017


Anti-theft system isn't allowing it too .
The Passlock™ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock™ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock™ System are as follows:
• The ignition lock cylinder and key
• The ignition lock cylinder case, including the Passlock™ sensor
• The ignition switch
• The body control module (BCM)
• The security indicator on the instrument cluster
• The powertrain control module (PCM)

2004 Pontiac... | Answered on Feb 05, 2017


Check before doing that, your insurance company may not cover you if the bags don't work.

2004 Pontiac... | Answered on Nov 03, 2016

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