20 Most Recent 2003 Pontiac Sunfire Questions & Answers


sensor 1 or sensor 2----- sensor 1 is in front of the cat converter 2 is behind converter on the exhaust system

2003 Pontiac... | Answered on Jun 30, 2019


replace the oraphace tube and retest

2003 Pontiac... | Answered on May 24, 2019


The 2003 Sunfire has been updated from Dexron II or III to Dexron VI per a Technical Service Bulletin from GM.

Automatic Transmission, 4T40-E Initial Fill..........6.5 liters
Automatic Transmission, Total Fill 4 speed 4T40-E..........12.2 liters


Good luck and hope this helps, if you do use Synthetic transmission oil, make sure it's a Low Viscosity Synthetic Transmission oil. High viscosity transmission oil will cause the gear shifting to stick and will cause shifting issues.

Thank you for using fixya and good luck.

2003 Pontiac... | Answered on Jun 28, 2018


Retrieve Abs and engine faulty code to find what could cause your problem (With a scanner)

Hope it helps.

2003 Pontiac... | Answered on Apr 22, 2018


Headlamps
The headlamps are operated when the driver places the headlamp switch in the HEADLAMP position. The LT HDLP and RT HDLP fuse in the IP fuse block, supply battery positive voltage to both the left and right headlamps. The low beam and high beam circuits continue to the headlamp switch. Depending on the position of the dimmer switch, either the low or high beam circuit will now have a path to ground. Ground is provided at G204. The low beam and high beam circuits also provide the body control module (BCM) with both low and high beam inputs. The headlamp switch includes the dimmer and the flash-to-pass switch.
If the headlight switch is left in the HEADLAMP position, the headlights will remain on until turned off or the battery runs dead.
Daytime Running Lamps (DRL)
Any function that turns on the headlights will cancel the daytime running lamps operation. The LT HDLP fuse in the IP fuse block supplies battery positive voltage to the daytime running lamp (DRL) relay coil circuit. The DRL relay switch contacts are connected to the low beam circuit. When the headlamp switch is placed in the OFF position, the BCM will turn on the daytime running lamps. The BCM energizes the DRL relay, closing the switch contacts and grounding the low beam circuit at G204. The DRL illuminate the low beam headlights at a reduced intensity. The DRL will operate when the ignition switch is in the RUN position, the gear selector is not in the PARK position and the parking brake is released. When these conditions have been met the DRL will illuminate.
DRL operation in Manual Transmission equipped vehicles will occur when the ignition switch is in the RUN position, and the parking brake is released.

Probably the dimmer switch . But without testing that would be just a guess . Turnning the headlamps on Any function that turns on the headlights will cancel the daytime running lamps operation..
No ,don't think the DRL relay has anything to do with it .

View wiring diagrams an testing the electrical circuits at the dimmer switch would be the proper way to diagnose .

2003 Pontiac... | Answered on Mar 06, 2018


Test for power at the rear defroster grid panels to make sure you're getting power and ground.

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


Problem is at idle only ? How's it drive at highway speed ? Lack power ? Random misfire , vacuum leak ,

2003 Pontiac... | Answered on Jan 09, 2018


Do you know how to test automotive electrical circuit's with a DVOM - digital volt ohm meter ? When adjusting the moon roof did you see any switches ? sunroof limit switch
Measure the reference voltage of the sunroof limit switch soft stop signal circuit at the sunroof control harness connector to a good ground.
Does the reference voltage measure near the specified value?
4.5-5.5 V
Notice: Do not open the sunroof glass past the full open soft stop position. Doing so may damage the sunroof assembly and or the roof top.
Connect a jumper wire to the sunroof limit switch soft stop signal circuit at the sunroof control module harness to a good ground.
Turn ON the ignition, with the engine OFF.
Using the sunroof switch, operate the sunroof system, not to exceed the full open soft stop position.
Does the system operate as requested?

Do you know what a wiring diagram is ? Free one's here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year ,make ,model an engine size . Under system click body & accessories ,then under subsystem click on sun roof . Click the search button then the blue link . See the control module , motor an the two switches ? One is probably miss adjusted . or bad !

Power Sunroof System Components
The power sunroof system consists of the following components:
• Sunroof control module
• Sunroof motor with the limit switches
• Sunroof switch
• Sunroof glass-spoiler type, with glass sliding above roof
• Sunshade
• Rail and track assembly upon which the sunroof glass rides
• Power sunroof system circuit breaker: PWR WDO 25 A
• Ground: G204

Sunroof Limit Switches
The sunroof limit switches track the position of the sunroof glass through two limit switches:
• Soft Stop limit switch through the sunroof limit switch soft stop signal circuit
• Vent Stop limit switch through the sunroof limit switch range signal circuit
The sunroof control module monitors the limit switches and based on the input combinations, determines the position of the sunroof glass. As a sunroof limit switch closes, the 5 volt reference will be shorted to the sunroof limit switch low reference circuit, pulling the 5 volt reference to 0 volts.
The sunroof control module monitors both sunroof switch input requests and based on the sunroof limit switch input combinations, will control an output to the sunroof motor, to drive the sunroof glass to the requested position.

Sunroof Motor
The sunroof has a bi-directional motor. When the motor is not operating both circuits are grounded. When the motor drives the sunroof glass in the direction from the closed to vent or vent to open position, the following occurs:
• Voltage is supplied to the sunroof motor open circuit.
• Ground is maintained to the sunroof motor close circuit.
When the motor drives the sunroof in the direction from the open to vent or vent to closed position, the following occurs:
• Voltage is supplied to the sunroof motor close circuit.
• Ground is maintained to the sunroof motor open circuit.
The sunroof control module is equipped with a timer circuit which stops the operation of the sunroof motor after 8 seconds.

2003 Pontiac... | Answered on Dec 23, 2017


Check the 20A AMPL FUSE in the I/P fuse block.

2003 Pontiac... | Answered on Dec 23, 2017


Yep , you will have to get the engine light code cleared at a garage , or buy the relevant OBD Code reader from E-BAY . They are fairly priced .

2003 Pontiac... | Answered on Oct 29, 2017


They may have crossed the vent line with the purge line. Use the evap diagram for the car to get the lines on the correct ports.

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


this may sound a little funny, but hands on experience is the best. go to a junk yard and experiment as to how to get it apart. Manuals do not always give you the little details you need to know. I have done this some times and it works out great when it comes to working on my own. You may also fine a good cluster that works at a good price.

2003 Pontiac... | Answered on Aug 11, 2017


I'd make sure you have fluid in your radiator. Does you AC blow cold? If it doesn't there is a chance you are low or out of fluid. This would lead to a crack in the radiator. Is it a crank shaft driven fan of electric?

2003 Pontiac... | Answered on Jul 12, 2017

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