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Discussion Starter · #1 ·
Hi all,

It's been a while since I have posted anything here. The past year has been fine, but then earlier this year (couple months back), I got a CEL for the very first time @41K miles. The code was P0299: Turbocharger Underboost. I took it to the dealership and they found the turbo charger had cracked and so got it replaced under power train warranty.

However now this past week, I got a new CEL showing up. The code shows up as P0420: Catalytic System Efficiency Below Threshold. :-( My engine idles rough sometimes when I coming to a stop and I can see the RPM climbing close to 1500 when I am in neutral and feet off the gas pedal.

I have made an apointment for next week with the dealership (their earliest available slot). Yesterday afternoon though while driving (heavy rains), I get two new messages show up. First about "Service Traction Control System" and then "Service StabiliTrac" or something to that effect. Then the "Traction Control" light stayed on for the entire drive home. These messages briefly came on this morning as well and then went away.

I'm getting really worried as it is raining here these days and I drive with two little children in the car.

Any ideas guys on what might be going wrong. I take good care of the car and have no mods. It is a 2013 ECO 6 spd MT. I'm at 42K+ and out of bumper to bumper warranty. None of my previous cars have every had a CEL come on. So this is new to me.

Thanks for any ideas.
 

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Discussion Starter · #3 ·
Hi Nick,

Thanks for your prompt reply. That is interesting. I'll go take a look at my ignition relay and see how things go. For whatever reason, I'm unable to open the attachment you uploaded. It comes back as an error. Would you please be able to upload that photo again?

Thanks
 

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Discussion Starter · #6 ·
Thanks Nick!

I'll check out the relay. In the past I have looked at my battery cables and the ends look very well crimped. I had also scrapped up the terminals and posts and applied electric (bulb) grease on them.

Looking through my manual I see there are two ignition relays (7 & 15). Do you know which one?
Text Font Line Number Parallel
 

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Discussion Starter · #8 ·
Hi all,

Just a quick update. I took my car in to the dealership Tuesday and got it back yesterday. They diagnosed it and found the cause was due to a diaphragm in the camshaft cover that was stuck open. So basically the valve cover was leaking and caused the fuel system to run lean etc.

This apparently caused all the error codes I was seeing as well as the drop in mileage and constant surging while idling. Sometimes the engine would race up to 2K RPM while coming to a stop and the clutch fully engaged or even if the gear was in neutral.

Anyway they claimed the battery negative terminal is fine. The dealership got all of this replaced under warranty and fixed. The car runs really smooth again and idle is back to around 800 RPM.

I love my dealership (Henna Chevrolet in Austin, TX) as they have so far been taking very good care of me and each time provide me with a great loner car.
 
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