Electrical issues
Thread Starter
Cruising
Joined: Sep 2017
Posts: 11
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From: Vicksburg Ms
Electrical issues
I have a 2011 C6 Grandsport that seems to go into the reduced power mode with a check engine light when it rains or is washed. It isn't every time but has done it about 6 or 8 times in the last 2 years. Thinking about a grounding issue. Anybody have this problem?
Le Mans Master
Joined: Oct 2014
Posts: 8,662
Likes: 2,722
From: Atlanta GA
post the code ..... Will help narrow down the list of what it could be .....
Le Mans Master
Joined: Oct 2014
Posts: 8,662
Likes: 2,722
From: Atlanta GA
sorry for taking so long to respond
That code pertains to the throttle position sensor in the throttle body or the gas pedal ....
Really don't think that either is bad but .
Battery issues are known for causing this code also
have you tried to have the code reset ? Any auto parts store can reset it for you
Then see if you get it again
Dave
That code pertains to the throttle position sensor in the throttle body or the gas pedal ....
Really don't think that either is bad but .
Battery issues are known for causing this code also
have you tried to have the code reset ? Any auto parts store can reset it for you
Then see if you get it again
Dave
Thread Starter
Cruising
Joined: Sep 2017
Posts: 11
Likes: 0
From: Vicksburg Ms
Thanks for that info.
My SCT programmer can clear the code. But itt clears itself shortly after shutting down. I'll check the battery. I found out the TPS was involved but haven't heard anything about the battery causing this. I plan to swap the TPS out with the one from my other vette. Might try swapping the batteries first. TPS is on accelerator pedal. Gonna be a pain in the neck, back and everything else to get to. I'm 6' and 240 lbs. it's enough work just getting I the drivers seat. Much less standing on my head. Lol. Thank you for helping.
Owen
Owen
sorry for taking so long to respond
That code pertains to the throttle position sensor in the throttle body or the gas pedal ....
Really don't think that either is bad but .
Battery issues are known for causing this code also
have you tried to have the code reset ? Any auto parts store can reset it for you
Then see if you get it again
Dave
That code pertains to the throttle position sensor in the throttle body or the gas pedal ....
Really don't think that either is bad but .
Battery issues are known for causing this code also
have you tried to have the code reset ? Any auto parts store can reset it for you
Then see if you get it again
Dave
Le Mans Master
Joined: Oct 2014
Posts: 8,662
Likes: 2,722
From: Atlanta GA
My SCT programmer can clear the code. But itt clears itself shortly after shutting down. I'll check the battery. I found out the TPS was involved but haven't heard anything about the battery causing this. I plan to swap the TPS out with the one from my other vette. Might try swapping the batteries first. TPS is on accelerator pedal. Gonna be a pain in the neck, back and everything else to get to. I'm 6' and 240 lbs. it's enough work just getting I the drivers seat. Much less standing on my head. Lol. Thank you for helping.
Owen
Owen
might need to use a GM TECH Two and do a Idle relearn ?
Dave
Thread Starter
Cruising
Joined: Sep 2017
Posts: 11
Likes: 0
From: Vicksburg Ms
I had a friend use his Snapon scanner to check the car after I cleaned the air filter, here I found the Volant intake badly deformed where it can't be seen. the part that the filter slips onto. It should have been sucking air past the filter here. I reformed it with a heat gun. the codes went away as did the check engine light. he also relearned the throttle body position and the crankshaft position. it was misfiring on alternating cylinders. no more misfire but I still have a jerking feeling when reducing speed and when going downhill. seems to be the worst at about 1500 to 1600 RPM. going to change the spark plugs next. have you or anyone else had this jerking feeling as the car is slowing down before? looking at other forums I've seen that the NGK TR55 is a good choice of plugs. others have had great performance from these plugs.
Le Mans Master
Joined: Oct 2014
Posts: 8,662
Likes: 2,722
From: Atlanta GA
Dave,
I had a friend use his Snapon scanner to check the car after I cleaned the air filter, here I found the Volant intake badly deformed where it can't be seen. the part that the filter slips onto. It should have been sucking air past the filter here. I reformed it with a heat gun. the codes went away as did the check engine light. he also relearned the throttle body position and the crankshaft position. it was misfiring on alternating cylinders. no more misfire but I still have a jerking feeling when reducing speed and when going downhill. seems to be the worst at about 1500 to 1600 RPM. going to change the spark plugs next. have you or anyone else had this jerking feeling as the car is slowing down before? looking at other forums I've seen that the NGK TR55 is a good choice of plugs. others have had great performance from these plugs.
I had a friend use his Snapon scanner to check the car after I cleaned the air filter, here I found the Volant intake badly deformed where it can't be seen. the part that the filter slips onto. It should have been sucking air past the filter here. I reformed it with a heat gun. the codes went away as did the check engine light. he also relearned the throttle body position and the crankshaft position. it was misfiring on alternating cylinders. no more misfire but I still have a jerking feeling when reducing speed and when going downhill. seems to be the worst at about 1500 to 1600 RPM. going to change the spark plugs next. have you or anyone else had this jerking feeling as the car is slowing down before? looking at other forums I've seen that the NGK TR55 is a good choice of plugs. others have had great performance from these plugs.
You air filter problem would have thrown a lean bank code if that was the issue ...
But this still could be your issue with the surging . a lot of aftermarket CAI will cause surging , The LS2 stock air box could also cause surging , GM added a HEMHOLTZ resonator to the LS3 air box to address this surging
As far as plugs , if the car is not modified I stick with the OEM plugs and heat range and just check them every now and then to make sure the TIPS are still there
Let us know what you find out
Dave
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Thread Starter
Cruising
Joined: Sep 2017
Posts: 11
Likes: 0
From: Vicksburg Ms
I would drive it for a while to see if that code comes back , the code you posted was for Throttle Position Sensor which is not only could be the gas pedal but also the sensor in throttle body
You air filter problem would have thrown a lean bank code if that was the issue ...
But this still could be your issue with the surging . a lot of aftermarket CAI will cause surging , The LS2 stock air box could also cause surging , GM added a HEMHOLTZ resonator to the LS3 air box to address this surging
As far as plugs , if the car is not modified I stick with the OEM plugs and heat range and just check them every now and then to make sure the TIPS are still there
Let us know what you find out
Dave
You air filter problem would have thrown a lean bank code if that was the issue ...
But this still could be your issue with the surging . a lot of aftermarket CAI will cause surging , The LS2 stock air box could also cause surging , GM added a HEMHOLTZ resonator to the LS3 air box to address this surging
As far as plugs , if the car is not modified I stick with the OEM plugs and heat range and just check them every now and then to make sure the TIPS are still there
Let us know what you find out
Dave
Thread Starter
Cruising
Joined: Sep 2017
Posts: 11
Likes: 0
From: Vicksburg Ms
Actually it’s been going on for a good while. My ex drives it. Just has gotten worse and she wants to trade it off. The Chevy dealer said I’d have to replace the factory air intake for them to figure it out. About $800.00 in just parts. I think that’s bs. Would you happen to know what the ohms resistance reading should be for the plug wires. Sho7ld all be the same being they’re all the same length.
Thread Starter
Cruising
Joined: Sep 2017
Posts: 11
Likes: 0
From: Vicksburg Ms
I blew it out with some low press air. And I tried swapping it out with the one off my other car by just plugging it up with the code for lean on both banks and code wouldn’t clear. So I didn’t run down the road. Guess I’ll swap them again with the codes cleared and see if it makes a difference. Thanks.
Le Mans Master
Joined: Oct 2014
Posts: 8,662
Likes: 2,722
From: Atlanta GA