Pontiac G8 GT, clicking noise behind dash along with dimming headlights for each click

Johnny Bryla

Asked by May 06, 2014 at 01:57 AM about the 2009 Pontiac G8 GT

Question type: Maintenance & Repair

80K miles, battery and starter check out fine.

Just started last week. Clicking noise about every 10 seconds coming from dash. Each
click corresponds with temporary dimming of headlights.

All accessories work fine EXCEPT for all four power windows -- each window goes
down about 1" per 10 seconds if you hold the window button down. Same going back

Tried turning off all accessories, various combinations of heat/cool settings no effect.
The clicking continues for about a minute even after turning off the engine and taknig
out key.

Sometimes in the morning, power window goes up and down normally, then later in the
day bad again.

4 Answers

Norm Davis

Check the power accessory delay capacitor and relay. If the capacitor is fried, the relay will engage briefly then default to the off position because of the amp draw. The power windows are also wired thru the capacitor, that's why I think that's where the problem is.

2 out of 2 people think this is helpful.

Hi Johnny, We are sorry to hear about the concerns you are experiencing with your 2009 Pontiac G8. We'd be happy to look further into this concern for you. If you'd like our assistance please reach out to us via email at socialmedia@gm.com. We hope to hear from you soon. Andraya R. GM Customer Care

1 out of 1 people think this is helpful.
Johnny Bryla

Norm, thanks for responding so quickly! I think that may be it. So to replace those two parts, is it a one-hour job? An afternoon? The whole day? I'm a half-decent car hack and I can do wiring fixes and good with a wrench and can read diagnostics codes with a friend's meter but if I have to take the dash completely apart that would stretch my capabilities and I might not be able to put it back together.

Norm Davis

Not sure of the time involved Johnny, but it's def a home mechanic type job. Check the voltage going in and coming out of the retained accessory power (RAP) with the key off. The relay is probably ok. Keep in mind that if any of the accessories that are powered off the RAP are drawing too much current, the relay will also cut out. So the RAP could be okay, but one of more accessories are drawing too much. You'll want to check all the connections. Start here: http://workshop-manuals.com/pontiac/g8/v8-6.0l/relays_and_modules/relays_and_modules_accessories_and_optional_equipment/accessory_relay/component_information/locations/ Good luck!

Best Answer

Your Answer

Add photo

Related Questions


Looking for a Used G8 in your area?

CarGurus has 457 nationwide G8 listings starting at $5,300.


Search Pontiac G8 Questions

Pontiac G8 Experts

#1 Markw1952
Reputation 60
#2 Norm Davis
Norm Davis
Reputation 50
#3 Chris McGee
Chris McGee
Reputation 40
View All

Related Models For Sale

Used Dodge Charger"
646 Great Deals out of 29,672 listings starting at $2,275
Used Chevrolet Camaro"
798 Great Deals out of 38,822 listings starting at $2,650
Used Ford Mustang"
733 Great Deals out of 41,077 listings starting at $900
Used Pontiac G6"
144 Great Deals out of 5,590 listings starting at $999
Used Cadillac CTS-V"
7 Great Deals out of 486 listings starting at $8,900
Used Pontiac Grand Prix"
30 Great Deals out of 4,357 listings starting at $1,995
Used Dodge Challenger"
436 Great Deals out of 25,366 listings starting at $7,980
Used Chevrolet Corvette"
434 Great Deals out of 20,224 listings starting at $3,688
Used Chevrolet Impala"
934 Great Deals out of 35,696 listings starting at $1,500
Used Chrysler 300"
581 Great Deals out of 20,784 listings starting at $1,490
Used Jeep Grand Cherokee"
1,214 Great Deals out of 73,883 listings starting at $1,593
Used Chevrolet Silverado 1500"
2,447 Great Deals out of 144,719 listings starting at $1,995

Used Cars For Sale

2009 Pontiac G8 GT For Sale
134 listings starting at $9,500
2008 Pontiac G8 GT For Sale
40 listings starting at $7,950