Today, I took the truck in to find out what the heck is going on with the tires and the old pressure.

Yesterday, I’d moved the truck so I could access it to add oil, only to find the oil pressure was back to normal. We checked the tires and all were evenly lower from when they were topped up, which could be attributed to the temperature changes.

I did not check the tires before I left, but I did notice that, as I was driving, the oil pressure gauge dropped again. The sensor for the left rear tire popped up a warning along the way, too. Previously, it has been front and rear, but just one got a warning this time. The “service tire monitoring system” warning is on all the time, so we do already know we have a sensor problem.

I took advantage of the situation and gave the truck a much needed car wash – I thought they might appreciate the undercarriage cleaning in particular! – then dropped the truck off. They had both bays occupied, so I just dropped off the keys. I did have a chance to talk to the mechanic about what was going on. One of the things he told me was that GMC has a problem with sensors in general; he’s replace many a sensor on GMC vehicles over the years. Of course, they would check anyway.

When I mentioned that the oil I’d bought was in the truck, since I never put any of it in, he asked if it was dexos oil. I could not remember seeing that on the label; I’d bought the oil at our local general store, and they had only one type of SAE 5W30, and it was a high performance oil. Beyond that, I couldn’t remember. He said he would take a look, when I told him where the bottles were.

I just checked and the dexos oil was developed for GM vehicles 2011 and newer. Our is a 2011. After I got home, I asked my daughter about it, as she was the one reading the user’s manual while I was driving, and she said the manual did say dexos, or equivalent.

Anyhow.

After dropping off the key, I headed out and had breakf… er… lunch at the next door Chinese restaurant.

It was excellent.

Then I headed over to a hardware store and got a few things I needed, including a small, folding step stool to keep in the truck. It was even 40% off, so that was good! I also grabbed some new deer screamers. I had an extra set I’d picked up a while back, but when I went to put them on, I found the self adhesive mounting foam was no longer self adhesive! Once I purchased this stuff, I headed back to the garage and grabbed the keys to unlock it so I could put things away, then applied the deer screamers. With so many deer out this winter, I did not want to be without them!

That done, I still had plenty of time, so I ended up walking over to the pharmacy. My husband had some prescription refills that needed to be special ordered in. Normally, those would have been delivered on Wednesday – two days from now – but since I was there, I checked. It turned out one of them had arrived just this morning, and the other was already in, so I was able to pick those up.

I wandered around for a while long, but there really isn’t a lot to do without spending money, so I headed back to the garage and waited in their office. They were just finishing up one of the vehicles in their bays, so it wasn’t long before that was switched out for our truck.

I got quite a chuckle when the mechanic went past me and asked, with a huge smile on his face, “are you a happy fly?”

I told him yes! Yes I was! 😂

Guess what song was playing when he started the truck?

I heard him ask our mechanic (the owner) the same question, but got a more confused response! 🤣 I love how excited he was to hear the song. 😁

The other thing he asked me was if I thought the problem could be the sensors, since the onboard computer also had the “service tire monitoring system” warning. I told him, yes, it could be – that’s what we need to find out!

He got the truck lifted up and started spraying the first tire, and right away I heard, “it’s the valve!” So of course, I went over to look (they let me do that! 😁)

This is the front driver’s side tire.

I came over to talk to him, and said I has been wondering if it might be the valve or the seal, because… well, these are brand new tires! He checked the seals, but there was no sign of a problem there, nor anywhere else on the tire.

After checking all four tires, two valves were like this, one was slightly less, and a fourth was so slight, he wasn’t sure it was leaking at all for a while. Interestingly, that was the tire that I got the warning for as I was driving in!

So they’re going to change all four valves.

But not yet.

I had a decision to make.

In talking about the “service tire monitoring system” warning with our mechanic before, I got a price of $60 for the part alone, but I didn’t realize the part was the valve. I didn’t know the tire sensors are in the valves. We’ve never had a vehicle with sensors in the tires before. He looked up and calculated the cost for me.

To get all four valves replaced, with parts and labour, will be about $420, plus taxes.

Ouch.

Or, we could replace them all with ordinary valves for about $100 now, and do the others later.

Or just do the ordinary valves and not have sensors.

If we did that, we would always have the warning light on, because the onboard computer would think we had zero tire pressure.

If we did the ordinary valves now, then did the sensors at a later date, we’d basically be throwing away a hundred bucks – but we’d have more time to save up the money.

Or we can just do the whole thing in January. It’ll be tight, but we could do it. Particularly since we’ll be done making payments towards that quarter beef we’re picking up in January. We’ve only got about $35 left on the balance for that, which will be paid on pick up day.

After asking how urgent it was, he said to just keep an eye on them and don’t drive on a flat tire.

So we’ll get it done in January.

While the mechanic was checking the tires, I mentioned to him that for us, we actually do have a possible vandal, and with both vehicles having tire issues, we can’t avoid thinking that someone is involved. He didn’t think that likely. He said that sometimes get dirt in around the valves which can damage them, and that, over time, aluminum rims like we have are more prone to it than other types of rims. He thinks that’s more likely the cause than vandalism. Which I suppose makes sense. This vehicle was used commercially by the original owner and, while it’s 4 years younger than my mother’s car, it already has more mileage on it. Until we have evidence to show otherwise, that’s the most likely scenario.

Then there was the oil.

Our mechanic looked at the oil I’d bought. It did not have dexos anywhere on the label, and he’d never heard of the brand before. Ultimately, he said to keep it in the truck, just in case, but he wouldn’t do an oil change with it!

The other mechanic, meanwhile did a thorough check for an oil leak while the truck was on the lift, then checked the oil again when it was on the ground, before topping it up.

The oil level was fine.

The dipstick is also different from any other vehicle we’ve had. It has markings on it, but no “maximum” or “minimum” markers, like I’m used to. Plus, my light when I checked it wasn’t very good, so I had a hard time seeing the level, anyhow. It just seemed like the shiniest part was low. It turns out what I thought was “low” on the dipstick is just fine. The truck is not low on oil. There is no leak.

Which means it’s another sensor problem.

Something to address another time.

Meanwhile, the tires got topped up and that was it.

They didn’t charge me for anything! I know they didn’t do any repairs, but they did use materials and equipment, not to mention their time, so I did expect to be paying something! Nope. He said we were good!

Well, that just means a little more from the budget towards getting the work done next month.

Once I got home, I called my mother. She has her telephone appointment with her doctor tomorrow morning, and I want to be there for it. Partly to answer any questions the doctor my have about the ER visits my mother may not remember anymore, and partly to help my mother understand what the doctor is saying. It turns out she thought it was today! Thankfully, she did have it written down on her calendar.

I wanted to know if my mother would need a shopping trip afterwards, since I would rather use the truck instead of her car, due to the icy road conditions in some areas. She’s still pretty well stocked up, she says, so she’ll just give me a list of the few things she needs, and I’ll pick them up without her having to come along. I’ve done enough shopping with her to know what she typically gets.

I’ll be driving the truck!

The next time I need to drive my mother’s car, we’ll have to make sure to check the tires on it, too. We’ll get it into the garage to see what’s going on there, too. Her tires don’t have sensors, though, so if her valves also need replacing, it’ll be a lot cheaper!!

So we got a mix of good and bad news today. We now know both why the tires have been getting low, and that it’s not the tires themselves that are the problem – which would have been a real shock, considering how new they are. The truck is otherwise fine. We mostly just have gremlins in some of the sensors. Nothing is urgent, from a safety point of view.

I do love technology, but the more technical things get, the more there is to break!

The Re-Farmer