Help with "Check Engine" Ligth
Thread Starter
Instructor
Joined: Dec 2009
Posts: 139
Likes: 0
From: Monroe NC
Help with "Check Engine" Ligth
We took our first "long" day trip in the Vette. Our first "fill up" - about half a tank was at a Valero station. After about another half tank, we filled up again at a BP station. I only filled up because we were in SC and gas is cheaper there than NC. Just after filling up, a few miles down the road, the "Check Engine" light came on and did not go off for the remainder of the trip, about 30 miles.
When we got home I grabbed my cheat sheet and ran the codes. There were three: PCM P1416 HC; PCM P1571 H; and IPC B0521 H. I am believing that the P1416 is the Current code which may be causing the problem. I did a quick search and ran across this post:
http://forums.corvetteforum.com/c5-t...eck-valve.html
Is this the problem and proposed solution or should I be looking for something else?
Thanks for any assistance anyone can offer.
Norm
When we got home I grabbed my cheat sheet and ran the codes. There were three: PCM P1416 HC; PCM P1571 H; and IPC B0521 H. I am believing that the P1416 is the Current code which may be causing the problem. I did a quick search and ran across this post:
http://forums.corvetteforum.com/c5-t...eck-valve.html
Is this the problem and proposed solution or should I be looking for something else?
Thanks for any assistance anyone can offer.
Norm
Tech Contributor
Joined: Jan 2007
Posts: 19,360
Likes: 1,127
From: Dyer, IN
We took our first "long" day trip in the Vette. Our first "fill up" - about half a tank was at a Valero station. After about another half tank, we filled up again at a BP station. I only filled up because we were in SC and gas is cheaper there than NC. Just after filling up, a few miles down the road, the "Check Engine" light came on and did not go off for the remainder of the trip, about 30 miles.
When we got home I grabbed my cheat sheet and ran the codes. There were three: PCM P1416 HC; PCM P1571 H; and IPC B0521 H. I am believing that the P1416 is the Current code which may be causing the problem. I did a quick search and ran across this post:
http://forums.corvetteforum.com/c5-t...eck-valve.html
Is this the problem and proposed solution or should I be looking for something else?
Thanks for any assistance anyone can offer.
Norm
When we got home I grabbed my cheat sheet and ran the codes. There were three: PCM P1416 HC; PCM P1571 H; and IPC B0521 H. I am believing that the P1416 is the Current code which may be causing the problem. I did a quick search and ran across this post:
http://forums.corvetteforum.com/c5-t...eck-valve.html
Is this the problem and proposed solution or should I be looking for something else?
Thanks for any assistance anyone can offer.
Norm
Pro
Joined: Jun 2004
Posts: 656
Likes: 5
From: Wright City MO
Just did it and it works. Won't hurt for you to give it a try.
Also, I noticed you have a 97 as I do.
Seems the 1571H code is common and won't go away as it is retained in history in the 97s.
Here is a post from some time ago explaining it.
1571 Code
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:
Vehicle may have a DTC P1571 [ASR (Automatic Slip Regulation) Desired Torque Circuit] stored in history that cannot be cleared. DTC C1277 (Requested Torque Signal CKT Malfunction) is NOT present and there is No Service Vehicle Soon lamp or powertrain related lamps on.
Recommendation/Instructions:
This is a normal condition. All 1997 YBs will have a DTC P1571 stored as history in the PCM that cannot be cleared. If P1571 is current, follow the trouble table in SI Document Number 101551. It should be noted that the schematic in this document incorrectly lists a ckt 449 dk blu/wht and calls it Real Time Dampening. This ckt is not present and should be ignored for both 97 and 98 (Document Number 203769) model year SI. A Service Information Update has been submitted.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar
Also, I noticed you have a 97 as I do.
Seems the 1571H code is common and won't go away as it is retained in history in the 97s.
Here is a post from some time ago explaining it.
1571 Code
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:
Vehicle may have a DTC P1571 [ASR (Automatic Slip Regulation) Desired Torque Circuit] stored in history that cannot be cleared. DTC C1277 (Requested Torque Signal CKT Malfunction) is NOT present and there is No Service Vehicle Soon lamp or powertrain related lamps on.
Recommendation/Instructions:
This is a normal condition. All 1997 YBs will have a DTC P1571 stored as history in the PCM that cannot be cleared. If P1571 is current, follow the trouble table in SI Document Number 101551. It should be noted that the schematic in this document incorrectly lists a ckt 449 dk blu/wht and calls it Real Time Dampening. This ckt is not present and should be ignored for both 97 and 98 (Document Number 203769) model year SI. A Service Information Update has been submitted.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar
Last edited by Slider-01; Mar 20, 2010 at 09:12 PM.
Thread Starter
Instructor
Joined: Dec 2009
Posts: 139
Likes: 0
From: Monroe NC
Perhaps either of you could offer some clarification....On the thread it says:
There is a "Y" that connects the main air supply hose to both check valves. It's located between the engine and the brake vacuum booster at the fire wall. You can either disconnect the hose for the specific defective valve or just spray carb cleaner in the main air hose and fog both valves. After the cleaning, I give it a good spray and doush of WD-40. This procedure works good for me and a bunch of guys on here.
I take that to mean I spray carb cleaner in the rubber hose that connects to the "Y". Then do I run the engine for few minutes, or just let it sit. Then, do I clear the check engine light or wait for it to go away on its own? Once it's gone, that's when I spray a generous amount of wd-40 in the same line - correct?
There is a "Y" that connects the main air supply hose to both check valves. It's located between the engine and the brake vacuum booster at the fire wall. You can either disconnect the hose for the specific defective valve or just spray carb cleaner in the main air hose and fog both valves. After the cleaning, I give it a good spray and doush of WD-40. This procedure works good for me and a bunch of guys on here.
I take that to mean I spray carb cleaner in the rubber hose that connects to the "Y". Then do I run the engine for few minutes, or just let it sit. Then, do I clear the check engine light or wait for it to go away on its own? Once it's gone, that's when I spray a generous amount of wd-40 in the same line - correct?
Pro
Joined: Jun 2004
Posts: 656
Likes: 5
From: Wright City MO
Perhaps either of you could offer some clarification....On the thread it says:
There is a "Y" that connects the main air supply hose to both check valves. It's located between the engine and the brake vacuum booster at the fire wall. You can either disconnect the hose for the specific defective valve or just spray carb cleaner in the main air hose and fog both valves. After the cleaning, I give it a good spray and doush of WD-40. This procedure works good for me and a bunch of guys on here.
I take that to mean I spray carb cleaner in the rubber hose that connects to the "Y". Then do I run the engine for few minutes, or just let it sit. Then, do I clear the check engine light or wait for it to go away on its own? Once it's gone, that's when I spray a generous amount of wd-40 in the same line - correct?
There is a "Y" that connects the main air supply hose to both check valves. It's located between the engine and the brake vacuum booster at the fire wall. You can either disconnect the hose for the specific defective valve or just spray carb cleaner in the main air hose and fog both valves. After the cleaning, I give it a good spray and doush of WD-40. This procedure works good for me and a bunch of guys on here.
I take that to mean I spray carb cleaner in the rubber hose that connects to the "Y". Then do I run the engine for few minutes, or just let it sit. Then, do I clear the check engine light or wait for it to go away on its own? Once it's gone, that's when I spray a generous amount of wd-40 in the same line - correct?
It is in the link that you referenced earlier: You see the large tube Bill has his fingers on (photos 4 and 5 in the link below; just pull that apart and spray towards the firewall:
http://forums.corvetteforum.com/1559066886-post18.html
I sprayed it with carb cleaner, forced it through with air, then sprayed WD-40, then followed up with air and let it set for a bit although you don't need to.
Go in and go to your codes; clear them then start the car and see if they return. You can run the codes without starting the engine.
That should hopefully take care of it.
Heel & Toe
Joined: Sep 2005
Posts: 22
Likes: 0
Slider....
Here's what I did....
Following your suggestion, used the hose coupling along the front fender; separated it and sprayed carb cleaner and the forced it in with compressed air; followed that with WD 40 and compressed air; put the hose back together and started the car..... OH MY....it started dinging and saying "reduced power" - couldn't get it above 2K RPM. Turned it off and restarted and everything seemed fine. Did not clear the code yet. I took it out for short spin, came back and then cleared the code and restarted the car - code did not reappear. Hopefully, that took care of the problem for a little while.
Thanks for your assistance. Everyone on this forum is so helpful and patient. Perhaps someday I'll be able to do the same for someone.
Thanks again!
Norm
Here's what I did....
Following your suggestion, used the hose coupling along the front fender; separated it and sprayed carb cleaner and the forced it in with compressed air; followed that with WD 40 and compressed air; put the hose back together and started the car..... OH MY....it started dinging and saying "reduced power" - couldn't get it above 2K RPM. Turned it off and restarted and everything seemed fine. Did not clear the code yet. I took it out for short spin, came back and then cleared the code and restarted the car - code did not reappear. Hopefully, that took care of the problem for a little while.
Thanks for your assistance. Everyone on this forum is so helpful and patient. Perhaps someday I'll be able to do the same for someone.
Thanks again!
Norm
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Pro
Joined: Jun 2004
Posts: 656
Likes: 5
From: Wright City MO
Slider....
Here's what I did....
Following your suggestion, used the hose coupling along the front fender; separated it and sprayed carb cleaner and the forced it in with compressed air; followed that with WD 40 and compressed air; put the hose back together and started the car..... OH MY....it started dinging and saying "reduced power" - couldn't get it above 2K RPM. Turned it off and restarted and everything seemed fine. Did not clear the code yet. I took it out for short spin, came back and then cleared the code and restarted the car - code did not reappear. Hopefully, that took care of the problem for a little while.
Thanks for your assistance. Everyone on this forum is so helpful and patient. Perhaps someday I'll be able to do the same for someone.
Thanks again!
Norm
Here's what I did....
Following your suggestion, used the hose coupling along the front fender; separated it and sprayed carb cleaner and the forced it in with compressed air; followed that with WD 40 and compressed air; put the hose back together and started the car..... OH MY....it started dinging and saying "reduced power" - couldn't get it above 2K RPM. Turned it off and restarted and everything seemed fine. Did not clear the code yet. I took it out for short spin, came back and then cleared the code and restarted the car - code did not reappear. Hopefully, that took care of the problem for a little while.
Thanks for your assistance. Everyone on this forum is so helpful and patient. Perhaps someday I'll be able to do the same for someone.
Thanks again!
Norm
However, if it ran fine and the code didn't reappear then that is goodness. You may have to run it a bit to git rid of the carb cleaner and WD-40 in the line and you may smell it for a while inside but it will go away.
Yes, this forum is a great resource with a lot of great minds on here (I'm not one of them, just an old jet jockey who loves Corvettes and knows a little) and it has saved me countless $$$ over the past several years just by trying the things recommended on here.
Glad it worked now go drive it!!!
v/r
Slider
Last edited by Slider-01; Mar 21, 2010 at 10:08 PM.
Burning Brakes
Joined: Dec 2006
Posts: 1,090
Likes: 80
From: Burleson Texas
Just did it and it works. Won't hurt for you to give it a try.
Also, I noticed you have a 97 as I do.
Seems the 1571H code is common and won't go away as it is retained in history in the 97s.
Here is a post from some time ago explaining it.
1571 Code
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:
Vehicle may have a DTC P1571 [ASR (Automatic Slip Regulation) Desired Torque Circuit] stored in history that cannot be cleared. DTC C1277 (Requested Torque Signal CKT Malfunction) is NOT present and there is No Service Vehicle Soon lamp or powertrain related lamps on.
Recommendation/Instructions:
This is a normal condition. All 1997 YBs will have a DTC P1571 stored as history in the PCM that cannot be cleared. If P1571 is current, follow the trouble table in SI Document Number 101551. It should be noted that the schematic in this document incorrectly lists a ckt 449 dk blu/wht and calls it Real Time Dampening. This ckt is not present and should be ignored for both 97 and 98 (Document Number 203769) model year SI. A Service Information Update has been submitted.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar
Also, I noticed you have a 97 as I do.
Seems the 1571H code is common and won't go away as it is retained in history in the 97s.
Here is a post from some time ago explaining it.
1571 Code
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:
Vehicle may have a DTC P1571 [ASR (Automatic Slip Regulation) Desired Torque Circuit] stored in history that cannot be cleared. DTC C1277 (Requested Torque Signal CKT Malfunction) is NOT present and there is No Service Vehicle Soon lamp or powertrain related lamps on.
Recommendation/Instructions:
This is a normal condition. All 1997 YBs will have a DTC P1571 stored as history in the PCM that cannot be cleared. If P1571 is current, follow the trouble table in SI Document Number 101551. It should be noted that the schematic in this document incorrectly lists a ckt 449 dk blu/wht and calls it Real Time Dampening. This ckt is not present and should be ignored for both 97 and 98 (Document Number 203769) model year SI. A Service Information Update has been submitted.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar
