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Old 03-19-2015, 10:52 PM
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coneman3
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Default check engine light

i ran over a branch with my C5 and my check engine light came on. thoughts?
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Old 03-19-2015, 11:00 PM
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What codes are present in the DIC?
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Old 03-19-2015, 11:02 PM
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Originally Posted by jdvann View Post
What codes are present in the DIC?
Not sure what DIC is. 1st time corvette owner and love it. my yellow check engine light came on. What is the DIC?
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Old 03-19-2015, 11:06 PM
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The awesomeness of the C5 is it has an onboard diagnostic....watch this vid.


Then post the codes here...and geniuses will follow....I am not one of them.
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Old 03-19-2015, 11:18 PM
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Originally Posted by jdvann View Post
the awesomeness of the c5 is it has an onboard diagnostic....watch this vid.

https://www.youtube.com/watch?v=svirjisy9g4

then post the codes here...and geniuses will follow....i am not one of them.
p 0492 hc
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Old 03-19-2015, 11:24 PM
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Originally Posted by jdvann View Post
The awesomeness of the C5 is it has an onboard diagnostic....watch this vid.

https://www.youtube.com/watch?v=SviRjIsy9G4

Then post the codes here...and geniuses will follow....I am not one of them.
i actually have about 17 or 18 codes. 1st one comes up as P 0492 HC
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Old 03-19-2015, 11:31 PM
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Here is a basic list of codes by module.http://www.stengel.net/diccodes.htm
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Old 03-19-2015, 11:35 PM
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Heed the above advice, Grasshopper.
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Old 03-19-2015, 11:47 PM
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I think the tree branch got caught in the engine bay and you blew your Johnson rod.
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Old 03-19-2015, 11:47 PM
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just kidding man ,, check your codes ,,, its probably not even related to the tree branch
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Old 03-19-2015, 11:53 PM
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Originally Posted by jdvann View Post
Here is a basic list of codes by module.http://www.stengel.net/diccodes.htm
code P 0492 H is not on the codes list. car is running well. thoughts?
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Old 03-19-2015, 11:55 PM
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Originally Posted by coneman3 View Post
code P 0492 H is not on the codes list. car is running well. thoughts?
The codes are listed by module...which module was that in? PCM?
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Old 03-19-2015, 11:56 PM
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DTC P0491 or P0492
Circuit Description
The secondary air injection (AIR) pump system is designed to lower exhaust emission levels on a start up. The AIR pump is timed to remain ON for approximately 1 minute or until Closed Loop is achieved.

The powertrain control module (PCM) commands the AIR pump relay ON by supplying a ground to the AIR pump relay control circuit. This action energizes the AIR pump, forcing fresh air into the exhaust stream. The PCM also commands the AIR solenoid ON which applies engine vacuum to the AIR shut-off valve. With vacuum applied to the AIR shut-off valve, airflow from the AIR pump flows through the pipes/hoses to the exhaust check valves, then enters into the exhaust stream. The air, oxygen, that is introduced into the exhaust system accelerates catalyst operation. When inactive, the check exhaust valves and the shut-off valve prevent air flow in either direction.

The PCM detects a system air flow condition by monitoring the heated oxygen sensors (HO2S) and Short Term Fuel Trim during normal Open Loop AIR system operation. This is a passive test. If the passive test indicates a pass, the PCM takes no further action. If the passive test fails or is inconclusive, the diagnostic will proceed with an intrusive or active test. The PCM will command the AIR system ON during Closed Loop operation under normal operating conditions. The active test will pass or fail based on the response from the HO2S. A lean HO2S response indicates that the AIR system is functioning normally. An increasing Short Term Fuel Trim value also indicates a normal functioning system. The AIR diagnostic consists of the passive test and the active tests. The AIR diagnostic requires failure of the passive and active tests on 2 consecutive key cycles to illuminate the malfunction indicator lamp (MIL) and stores a DTC. If the PCM detects that the HO2S and Short Term Fuel Trim did not respond as expected on one of the engine banks, DTC P0491 for bank 1 or DTC P0492 for bank 2 sets.

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Old 03-19-2015, 11:58 PM
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erase the code from your DIC like it instructs you in the video and see if it comes back.

if it does then the car probably needs to go up on a lift and see what is wrong.

Hopefully you can visibly see a broken wire or something pulled out of place .
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Old 03-19-2015, 11:58 PM
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Originally Posted by jdvann View Post
The codes are listed by module...which module was that in? PCM?
PCM yes sir. you scared the **** out of me with the johnson rod lol
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Old 03-20-2015, 12:02 AM
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Old 03-20-2015, 12:06 AM
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Originally Posted by stu12dozen View Post
Thanks so much!!!!!! that worked!!!!!!! Best forum ever!!!!! i'm not worthy!!!! grasshopper is learning!!!
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Old 03-20-2015, 12:15 AM
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Originally Posted by coneman3 View Post
Thanks so much!!!!!! that worked!!!!!!! Best forum ever!!!!! i'm not worthy!!!! grasshopper is learning!!!
There are vast resources of knowledge in here...I read this place constantly. Most of our problems are well documented and doing the old Google search is great place to start. However there are some geniuses on here (dadaroo and 8vette7) that can diagnose issues that seem impossible to solve.
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Old 03-20-2015, 07:57 AM
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on getting the check engine light solved and watch out for those branches in the road.
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Old 03-20-2015, 09:22 AM
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Leave the branch to these guys.


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