Transmission issues (Loss of power)?

You said this lack of power problem happening before the repairs were done, so there’s nothing the dealer could have done to cause this.

What is the mpg of your CX-5? Have you checked the tire pressure?

If your 2018 CX-5 no longer has new car warranty, you still can take in to your Mazda dealer and complain the lack of power issue under powertrain warranty by saying you drove the loaner car and found your CX-5 definitely is lacking power. Or (somebody else may suggest) you may say you found the engine is lacking power since the repairs were done when the car was under new car warranty.

The whole thing is unfortunate to you. But your lack of power issue can be caused by too many possibilities. A thorough inspection with Mazda diagnostic computer may be the best way to figure out what is happening to your CX-5. IMO the transmission is the least likely culprit to your lack of power problem.

I had new tires put on a few weeks back (continental lx25). Pressure is excellent (around 39psi). The car says my mpg is 29 but my actual seems more like 25. This is with mostly highway. With the loaner for 2 weeks on similar routes, it averaged 29 actual. Definitely concerning.
 
:
2020 CX-5 AWD
.... I'm seriously wondering if the compression can lower from that rocker arm falling out of place? ....
Rocker arm removal and reinstallation is part of the HLA replacement procedure, so a detached arm would have been totally obvious to the tech doing the work.

Just some friendly advice, to not ask your service department to do anything to your vehicle (reflashing or anything else), or suggest any possible reasons for what you're experiencing. You need to keep in mind that you will need to convince them of the problem you believe your vehicle is having. Telling them how to do their job will not help your case in any way, and might very well create a barrier to what you're trying to accomplish.

So I recommend just keeping it simple and asking them to take a ride with you so you can point out what is happening. If you can get them to agree with you that a problem does exist, then I'd expect them to continue the diagnostic process without you needing to do anything else.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
Yeah I didn't think it was transmission related. Except maybe the issue of under filling I read about on here. Fortunately, I have a cpo warranty until November of 2021. So far I'm thinking of having them update the firmware for cd, transmission (I think I read about a tsb on shift points around here), and a compression test. I'm seriously wondering if the compression can lower from that rocker arm falling out of place? Most say it isn't discernible at low speeds but if it is that, I can tell whereas someone like my wife or regular driver would never noticed at low speed.
If you have CPO warranty, you can take your CX-5 back about your lack of power concern. You don’t want to diagnose the problems or concerns by yourself and telling the dealer to do compression test or update the PCM at first. You job is to persuade the tech that your concern is legit by presenting the evidence. edmaz’s advice above is excellent, you want to keep it simple.

For your lack of power problem it seems the engine itself could be not efficient from factory. It’s typical that all engines are not assembled equal. Some are more efficient than others. More efficient engines will have better fuel economy and more power. Your engine may also have problems with the lack of power so obvious that when you compare another CX-5 going up the same hill, yours have to downshift and the other CX-5 doesn’t have to. The 39 psi on tire pressure is fine, but the 25 mpg on actual highway gas mileage is very poor. In any event convincing the tech on lack of power problem with the evidence of very poor gas mileage is a tough task, and don’t be surprised the reply is “it’s normal” after all the effort you made. This may be the reason why (very poor gas mileage and nothing the dealer can do) the previous owner got rid of this 2018 CX-5 before the new car warranty expires.
 
Last edited:
:
2017 Mazda 6 Sport
Yeah I didn't think it was transmission related. Except maybe the issue of under filling I read about on here. Fortunately, I have a cpo warranty until November of 2021. So far I'm thinking of having them update the firmware for cd, transmission (I think I read about a tsb on shift points around here), and a compression test. I'm seriously wondering if the compression can lower from that rocker arm falling out of place? Most say it isn't discernible at low speeds but if it is that, I can tell whereas someone like my wife or regular driver would never noticed at low speed.
The update for CD was a recall and would have been taken care of before the vehicle could be CPO'd (if it hadn't already been done by the previous owner).

It's not really an accurate gauge to compare a 3 year old engine with lots of miles on it to a new one. There have likely been many updates to the engine tuning, suspension, transmission, etc., in that time. I drive Mazdas everyday and there is a ton of difference in feel and performance between my 2017 Mazda 6 with 37k miles on it and a new one, even though they have the same engine. You might want to try a few Italian tune-up runs to reset the PCM and see if that helps
 
The update for CD was a recall and would have been taken care of before the vehicle could be CPO'd (if it hadn't already been done by the previous owner).

It's not really an accurate gauge to compare a 3 year old engine with lots of miles on it to a new one. There have likely been many updates to the engine tuning, suspension, transmission, etc., in that time. I drive Mazdas everyday and there is a ton of difference in feel and performance between my 2017 Mazda 6 with 37k miles on it and a new one, even though they have the same engine. You might want to try a few Italian tune-up runs to reset the PCM and see if that helps
The car has 25k on it. It's hard to explain, but I know it isn't right.
 
If you have CPO warranty, you can take your CX-5 back about your lack of power concern. You don’t want to diagnose the problems or concerns by yourself and telling the dealer to do compression test or update the PCM at first. You job is to persuade the tech that your concern is legit by presenting the evidence. edmaz’s advice above is excellent, you want to keep it simple.

For your lack of power problem it seems the engine itself could be not efficient from factory. It’s typical that all engines are not assembled equal. Some are more efficient than others. More efficient engines will have better fuel economy and more power. Your engine may also have problems with the lack of power so obvious that when you compare another CX-5 going up the same hill, yours have to downshift and the other CX-5 doesn’t have to. The 39 psi on tire pressure is fine, but the 25 mpg on actual highway gas mileage is very poor. In any event convincing the tech on lack of power problem with the evidence of very poor gas mileage is a tough task, and don’t be surprised the reply is “it’s normal” after all the effort you made. This may be the reason why (very poor gas mileage and nothing the dealer can do) the previous owner got rid of this 2018 CX-5 before the new car warranty expires.
This will be a very difficult thing to prove. It requires that someone be so in tube with the car, they can feel it from other cars. I know there are differences in efficiency and power between even same cars, but I feel this is more than normal. Good advice on me not telling the tech how to do his job. 8 was just hoping not to go back again and again to get something resolved. I feel something like this is easy to write off as "normal".
 
Rocker arm removal and reinstallation is part of the HLA replacement procedure, so a detached arm would have been totally obvious to the tech doing the work.

Just some friendly advice, to not ask your service department to do anything to your vehicle (reflashing or anything else), or suggest any possible reasons for what you're experiencing. You need to keep in mind that you will need to convince them of the problem you believe your vehicle is having. Telling them how to do their job will not help your case in any way, and might very well create a barrier to what you're trying to accomplish.

So I recommend just keeping it simple and asking them to take a ride with you so you can point out what is happening. If you can get them to agree with you that a problem does exist, then I'd expect them to continue the diagnostic process without you needing to do anything else.
This is a load off my mind to know that they have to remove the rocker arms and reinstall just to do the hla's. At least I know that's right. Again, someone else suggested not telling them what to do as well. Good advice that I will heed.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
This will be a very difficult thing to prove. It requires that someone be so in tube with the car, they can feel it from other cars. I know there are differences in efficiency and power between even same cars, but I feel this is more than normal. Good advice on me not telling the tech how to do his job. 8 was just hoping not to go back again and again to get something resolved. I feel something like this is easy to write off as "normal".
Can you tell if the engine is using any oil?

If I were you, I’d gather some stats (gas receipt with mileage interval) to show very poor MPG, and tell the service advisor about the lack of power concern with the comparison going the same uphill. I’d ask what they can do to check such problem, and may be kindly mentioning if they can do a compression test and even a leak-down test to find out the engine condition.

And I’d do this way before my CPO warranty expires, unless I only intend to keep my vehicle for a very short period of time. And if I had a car with so many “major” problems like yours within warranty (valve cover、timing chain cover、and oil pan leaks、HLA failing at 25K miles!), I’d consider to dump it once the warranty is gone even though I’ve always wanted to keep a car forever. Call me superstitious, if a car keeps having problems since new, chance are it’ll keep having problems endlessly.
 
Last edited:

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
⋯ On the other page(s) of that paperwork, do you see any line item that looks like number of hours for labor? It's just an insignificant thing, but I'm always interested in what the automakers consider to be the appropriate amount of time for a tech to do a job.
I believe the invoice OP posted says “UNIT 3.5” labor hours for HLA replacement.
 
Can you tell if the engine is using any oil?

If I were you, I’d gather some stats (gas receipt with mileage interval) to show very poor MPG, and tell the service advisor about the lack of power concern with the comparison going the same uphill. I’d ask what they can do to check such problem, and may be kindly mentioning if they can do a compression test and even a leak-down test to find out the engine condition.

And I’d do this way before my CPO warranty expires, unless I only intend to keep my vehicle for a very short period of time. And if I had a car with so many “major” problems like yours within warranty (valve cover、timing chain cover、and oil pan leaks、HLA failing at 25K miles!), I’d consider to dump it once the warranty is gone even though I’ve always wanted to keep a car forever. Call me superstitious, if a car keeps having problems since new, chance are it’ll keep having problems endlessly.
I can check on if it's using oil. Yeah I don't like all these things. Lots of issues for being such low mileage. I don't know that I'd get my money back on it. Plus I did 2 major credit checks for getting this car and doubt I would qualify again so soon. It hit my credit hard
 
:
2020 CX-5 AWD
I believe the invoice OP posted says “UNIT 3.5” labor hours for HLA replacement.
I did notice that, but didn't want to believe that Mazda would actually be paying a tech for only that many hours for this HLA replacement job. But perhaps 3.5 really is their number, which would go a long way to explaining why these automakers aren't able to hold onto the better techs.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
I did notice that, but didn't want to believe that Mazda would actually be paying a tech for only that many hours for this HLA replacement job. But perhaps 3.5 really is their number, which would go a long way to explaining why these automakers aren't able to hold onto the better techs.
You’re absolutely right. Discussed with a master tech at my Mazda dealer about several questionable warranty repairs on my 2016 CX-5 when I asked him to re-check rear disk caliber condition base on a TSB which was denied by the tech who performed all the work. He said they have major problem to recruit good techs, compounded by most young generations who are not interested in doing the mechanical work which makes their hands dirty.

Not just the Mazda, car manufactures only allow a set labor hours for specific job under warranty. Usually the tech has to work for longer hours than set labor hours for a specific job. 3.5 labor hours allowed seems to be correct for the HLA replacement job although a good tech with HLA replacement experience should be able to finish the job within 4 hours without any break.
 
Last edited:
:
GA prior 16 CX5 GT
:
20 CX5 GT + Prem
You might do a 0-60 mph time test and see how much longer it takes than other similar cars and what is posted in car magazines for your year car. Takes the feel out of it with real comparable data within a second or so due to temp etc.