2023 Z51 Corvette (immaculate with 5.5k miles), bought used mid-December 2024. On way home from dealer, stopped to get gas and saw a check engine light. Got home and next day I started it up and drove a bit and saw no check engine light. Put 50 miles on car and bedded it for Winter. First trip out of Winter storage (car had a battery maintainer connected in frunk), drove car about 75 miles and saw a check engine light. Drove home immediately. Later in day, I got an e-mail from OnStar advising me of the codes: P06DD oil pressure sensing system, and B108E ignore unknown DTC. Took car to dealer, next day I got the car back with the excuse that "Maybe it was because of the 3 month storage. Oil had all drained down to pan". That's a good one!! They said "If it happens again, we'll have to diagnose further". Took it home, and 4 days later took car out and after several miles got the check engine light again. Drove to dealer and left it there yet again. A day later (today), I was called and told that the mechanic (who is a certified Corvette mechanic) was in contact with the engineers and was following a flowchart to narrow down the issue. I was told that for Corvettes AND electric cars they want EVERYTHING to go through engineering. It is engineering that will dictate what to fix or replace. I have a total of about 150 miles on the car since I bought it. Needless to say, I'm PISSED. Have any of our community members had this issue?

 

When was the oil last changed? date and mileage?

 

Oil & filter were changed when in for the FIRST time for the check engine light, so I don’t think we can look suspiciously at that.

 

Update - Today Service Manager called to inform me that the oil pump module must be replaced, as per GM engineers. Parts not in stock are being ordered. Engine likely has to be at least partially dropped to perform this job, perhaps totally removed. Car with 5.7k miles, of which I've put on 150 of them, has to be ripped apart and I'll be without it for at least 1 week or more. I cannot believe that this issue did not manifest itself when the original owner had it. And he was **** and meticulous about caring for the car, too. Yeah well, I have little choice but to fasten my seat belt and go for this ride. And I must add that I'm VERY tight with this dealership and the owner. Have bought quite a few cars from them and trust them. They have always treated me like royalty and feel quite confident this matter will be properly taken care of (Oh how I hope I'm right). We'll see.

 

Have you considered a trade-in? Seeing you have a good deal of interaction with the dealership, maybe you can great deal to upgrade to a 2024/2025?

 

Yes, I too would be looking to move on and leave it to the next owner (as may have happened to you despite your comment about the previous owner), sorry as that may sound. But, best of luck with it, in any event.

 

Why trade? It's a C8 that was meticulously cared for by its previous owner according to the OP. He is tight with the dealer. Parts fail. Get it repaired and drive it!

 

I paid $68k for this beautiful Red Mist Z51 car with 5.5k miles on it, with OEM optional wheels (beautiful) and 2LT interior in "Natural" color (also beautiful). Dealer, knowing I was soon gonna store it for Winter real soon, ordered and gave to me for free a factory car cover. Car looks like it was just driven off the showroom floor, and I say this being the VERY picky guy that I am. I actually thought about approaching the dealer about trading this in, but in all likelihood, I would have to spend quite a bit more for a car possibly less taken care of. Previous poster said it: Parts fail on ANY car, even expensive ones. I'm gonna see how this plays out with this dealer. He has earned my trust and respect through the years.

 

Bingo. Just let them fix the car and hopefully that will solve any issues for a long time.

 

[QUOTE=vetter53;1608657149]2023 Z51 Corvette (immaculate with 5.5k miles), bought used mid-December 2024. On way home from dealer, stopped to get gas and saw a check engine light.
[QUOTE]

Hard to understand that you didn't even get home from the dealer on Day 1, got a check engine light and didn't immediately return to the dealer. No blame just seems like a bit too much trust. Didn't the thought of immediately going back to the dealer instead of going home and storing the car for 3 months? At least it's under warranty and your fortunate to know the original owner. Did he ever have a CEL on this car and was he the original owner?

 

I didn't have the time to go back to the dealer. I planned to take it in first thing next day, left house to go and never saw the light again, so I thought I'd let it ride. Week later after 50 miles, put it to sleep for Winter and didn't see the light. I'm pretty certain that the previous owner must have had this issue. What I'm NOT certain about is if the owner (the first owner of the car), reported the light to the dealer and if he did, did the dealer just clear the light hoping it was a one-off issue. At this point I don't feel that questioning the dealer about this would be advantageous to me. It might actually make the dealer somewhat "defensive", and I prefer not to go there. The car has OEM warranty until this June, and I have 3 more years after that due to CPO status and extra insurance I bought.

 

Your in great shape with the dealer and having a CPO. Agree with you just leaving the dealer out of it, however knowing the previous owner is really a plus.

I would start up a conversation that you ended up buying his trade-in a just ask him what his thoughts were on his car that you just purchased. Find out some history on it since being able to know the owner from a dealer purchased car is rare. I would for my own knowledge ask him if he was possibly the 1st owner or if it was previously owned when he bought it.

Wouldn't hurt to start up a conversation on his C8 ownership experience and if he ever had any nagging issues or prior CEL. Never hurts to kick it around on his experience with this particular C8. Never know you might learn something unique or worth knowing about anything on your newly purchased C8.

 

So, as stated in the Owners Manual, in the procedure for changing the oil, it takes a mere 20 seconds to pump any oil from the pan back to the oil tank. It is true that over time, the oil in the tank will very very slowly leak back into the pan, but if the oil pumping system is working correctly it will rapidly scavenge that oil from the pan, back into the the tank. So, if you drove for more than 20 seconds (which you did), and if the oil pumping system was working properly, then that would not be a problem. But.....it appears in your case that there was some issue with the oil pumping system. I do not know what an "oil pump module" is - I never heard of that. Is that an oil pump, or a module that controls it? I searched the service manual and could not find anything called an oil pump module. There are at least two oil pumps. One pumps the oil from the bottom of the tank to lubricate the engine. The other pump scavenges oil from the oil pan and returns it to the tank. But no mention of an oil pump module or oil pump control module.

 

I found the codes P06DD & B108E. B108E indicates and issue with the ambient light sensor that is used to control daytime running lights and automatic headlamp control.

P06DD is one of a family of codes (P06DA through P06DD) that indicate an issue with the Engine Oil Pressure Control Valve or related controls/circuit. They all point to the same diagnostic procedure. Depending on the outcome of the diagnostic tests, there are various possible remedies. These include:

1) repairs to wires or connectors

2)Dirty Oil…

3) Replace the component: Q44 Engine Oil Pressure Control Solenoid Valve

4)Replace the component: K20 Engine Control Module

I have not been able to find a procedure for replacement of the Engine Oil Pressure Control Solenoid Valve.

 

I called dealer yesterday to find out if ordered parts came in. Everything in except "4 bolts". I'm thinking they're designed to stretch when initially torqued, so can only be used once (just my guess). They were expected in today. Of course, after the repair, I will have a list of replaced parts and will share here.

 

Update. Stopped in today to see what was happening with the Corvette and was told that while the required parts are all there, they had to order 2 tools that GM requires to be able to support the engine properly during the job. Those 2 tools will be in on Tuesday, and work should begin Wednesday.

 

That’s pretty interesting. A Chevrolet dealership that has a corvette specialist had to order tools to install parts that they had to order because of a check engine light they didn’t really investigate.

You sound like you have a good working relationship with this dealer but to me the dealer doesn’t seem to have a good working relationship with you. This is your business but I think I would have really started to lean on the service manager about getting this done. The delays will only increase the negative feelings you have about the car. It’s easy to see why you like it the Red Mist with natural interior looks pretty awesome.

 

@vetter53 , I do not agree that your dealer did not investigate the MIL (aka CEL) and the underlying DTC that you reported. I think they very likely did on the first visit, and obviously did on the second visit. As mentioned earlier in this thread, the P06DD points to a diagnostic procedure, and there are various remedies associated with that depending on the outcome of the tests. One of the outcomes is "All OK", and the vehicle is returned to the customer. As with nearly all procedures, they include a sequence of tests, that may involve checking a few things out, then clearing the DTC, then checking to see if it returns. For the code you reported, in the procedure I found, I attached a subset of those step. Your dealer may very well have performed the required procedure and got this outcome. Problems are often intermittent. When you went back with the same problem, they probably ran the procedure again, perhaps getting the same result - perhaps a different result - perhaps a result that was not covered by the procedure. But..for whatever reason, they contacted GM engineering about it - clear proof of an investigation the second time.

Needing to order parts is not that unusual. Not having a "tool" to lower the engine ....is....well unfortunate, but it sounds like they have not done whatever this replacement procedure calls for before. Its not clear what the are replacing - I could not find anything called an oil pump module. But they may be replacing one of the two oil pumps. Or the valve I mentioned in an earlier post. I have to say I have not seen another C8 forum report about replacing either of those components. So it may not be surprising that the dealer had to order a tool. To me it sounds like they are doing their best to stay on top of this.

 

The tools needed are likely because they have never as yet had to perform this repair on a C8. They are not a high-volume Corvette seller. I was told that the oil pump is not communicating well with the computer that monitors oil pressure (or the other way around). The code points to the sensor module. I'll be more definite when I get the paperwork after the repair. And I DO think that this problem existed prior to me buying the car. But I don't yet know if the issue was reported by the original owner or not. I'm reluctant to attempt to reach out to him because I'm not sure how he would feel about it. It's a sticky situation, and I don't wish to rock the boat too much at this point in time. Trust me, I'm not a gullible idiot. I used to race Chevy's back in the 70's, and have extensive engine knowledge, having built several small AND big blocks. And I was ASME certified back then as well, as I worked as a mechanic for a bit of time. But today's animal is a vastly different, highly complex creature, which can complicate things a lot. Am I nervous - yes. Do I thrust the dealer - yes. Do I trust the Service Manager - yes. He's a very customer-oriented guy. I've spoken to him enough about this matter that he KNOWS I know more about engines than the "average guy". And I was correct about the 4 bolts they ordered. I said that they were probably stretch bolts and the Service Manager confirmed this yesterday. Once stretched by initial torquing, they must be replaced if disassembly is required. I'll keep you all posted. When I know, you'll know.

 

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Yes. In many procedures there will be a list of what they call "single use" components - they can be gaskets, bolts, maybe other things. And the procedures are very clear about removing and DISCARDING single use components. Its more good evidence that the tech is following procedures. (although I still cant find a procedure for the replacement of whatever they are replacing exaclty). But the way, the module that controls the oil pump is the ECM (engine control module).