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PostPosted: Mon Jan 21, 2019 9:38 am 
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Location: Indianapolis, Indiana
Year and Trim: 2004 Bonneville GXP
2008 Grand Prix GXP
So I have a question about my Grand Prix GXP. and wasn't sure where to place this. Sorry.
I thought I would use the engine block heater since the windchill is past 0 °F. .... Yesterday the car started right up and since it sits outside I clear the ice off it while running. The temperature on the gauge reads normal after it ran for several minutes. So I took the car on a short drive and I get the message on the DIC. " A/C off engine protection " I look at the gauge and it's zero. Not working? I get the car home, and check the coolant level all is fine, no leaks. Also noticed that the engine cranks several seconds to start, The length of the trip was only about 2 miles under 25 mph. I replaced the spark plugs and wires in August. And it's had a coolant flush and new thermostat in November. Anybody have ideas?? I wonder if it was just that the car was not moving fast enough. And the fans ( which have new relays ) didn't come on. I don't know if the engine block heater had anything to do with it. And wonder what the problem would be. Is it just the cold.??And the low speed and short distance??


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PostPosted: Mon Jan 21, 2019 1:17 pm 
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Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
I wonder if the coolant temp sensor took a dump, and the pcm freaked out. Has the car been ran since then? If so, what happened on the next trip?

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1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
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PostPosted: Mon Jan 21, 2019 1:53 pm 
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Location: CHICAGO
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Yes. This is actually quite common on GM engines across many platforms, especially newer ones like the ecotec's that actually use two ECT's (one that feeds the BCM for cluster function and the main one that feeds the PCM operational data). I think the GXP has only one, but not sure.

I think the important check here is whether or not you're getting P0128 with it. If so, that could be a stuck open T-stat.

But if everything mechanically is working properly (I.E. your cooling system) and you're getting this message, and your temp gauge isn't working... ECT sensor.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Mon Jan 21, 2019 2:18 pm 
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Location: Indianapolis, Indiana
Year and Trim: 2004 Bonneville GXP
2008 Grand Prix GXP
Well, I just now started the car and all appears normal
I will check and advise. One thing... would it throw a code P0128 and no ses indicated ?


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PostPosted: Mon Jan 21, 2019 4:27 pm 
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No. P0128 would command the light on because if a T-Stat is stuck open it (the engine) isn't able to warm up to get into Closed Loop operation, at least not within a specified time frame, which would be an emissions issue.

Also, check wiring to/from that sensor.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Mon Jan 21, 2019 5:27 pm 
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Joined: Sat Oct 20, 2012 7:06 pm
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Location: Indianapolis, Indiana
Year and Trim: 2004 Bonneville GXP
2008 Grand Prix GXP
I scanned it and checked the wiring. No code and the wires seem in good condition and tight. The car started right up and ran well ( it always ran well. Just hard to start.) It baffles me why the gauge went to zero. Then I thought maybe the engine block heater had something to do with it. I guess it was just the cold weather. Lane. You still have the Impala SS, ? I only found one ECT next to number 1 spark plug. Thanks guys for the help.


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PostPosted: Mon Jan 21, 2019 7:03 pm 
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Location: CHICAGO
Year and Trim: 2006 STS-V, 2004 GTO, 2009 G8 GT
Yes, it's out in Maine now though... :(

This guy, on the cylinder head, just above by plug socket/extension.
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_________________
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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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