2021 RDX ADVANCED All Warning Lights, Twice
05-04-2021, 11:29 PM
#1
2021 RDX ADVANCED All Warning Lights, Twice
Hello all,
Owner of a 2021 RDX Advanced, leased. After about 5 months of driving, with only 2,000 miles on the odometer, while I was idling at a store, all of my vehicle's warning lights came on advising on a dealership inspections. At this point, all of the vehicle's systems did not work. Upon bringing the vehicle into the dealership, first, as I expected, I was accused of using the vehicle in accessory mode. After I advised that this was not the case, they inspected it and pulled "DTC C0044-F0 Master Cylinder Pressure Sensor failure." They then replaced the sensor and sent me on my way. Around 700 miles later, the issue comes right back.
Here's the kicker.
They give me a loaner and the loaner lights up the same way, Lol. Now, because the loaner's warning lights lit up: (ABS, ACC, elec parking brake, AWD etc,) when I speak with the dealership over the phone, they're like, "Oh then it must be user behavior." I then instantly realize they must not read these forums because after looking, this appears to be an issue as far back as 2015 according to some forums.
Now, however, the only thing I can think of that may or may not have to do with these lights coming on, and I could be wrong considering the first instance was a sensor failure, is the idling. The dealership seemed to be more concerned about the vehicle potentially being on in accessory mode (which is obviously not the case because this would obviously cause a dead battery pretty quickly,) but they did not seem too concerned about me idling the engine for 30 minutes to an hour. After doing some research online, I found, and correct me if I am wrong, excessive idling can potentially cause battery voltage issues and in turn, subsequent error codes. At the same time, I am a bit doubtful that this is the issue because I am sure many of you have idled for a time and never experienced these issues. Additionally, since the pressure senseor valve was the result of the first error code, vehicle idling could not have been the culprit.
As of now, I am still waiting to hear back with results, and the loner, after driving a few miles, has cleared the codes by itself. I should also note, during the second instance, the codes cleared by the time I went to the dealership. In the first instance, they cleared and then came back after a while.
Any ideas? Or, am I on my way to lemon city? I have had a CR-V and Civic, and I have never experienced anything near as critical as this.
Thank you,
Owner of a 2021 RDX Advanced, leased. After about 5 months of driving, with only 2,000 miles on the odometer, while I was idling at a store, all of my vehicle's warning lights came on advising on a dealership inspections. At this point, all of the vehicle's systems did not work. Upon bringing the vehicle into the dealership, first, as I expected, I was accused of using the vehicle in accessory mode. After I advised that this was not the case, they inspected it and pulled "DTC C0044-F0 Master Cylinder Pressure Sensor failure." They then replaced the sensor and sent me on my way. Around 700 miles later, the issue comes right back.
Here's the kicker.
They give me a loaner and the loaner lights up the same way, Lol. Now, because the loaner's warning lights lit up: (ABS, ACC, elec parking brake, AWD etc,) when I speak with the dealership over the phone, they're like, "Oh then it must be user behavior." I then instantly realize they must not read these forums because after looking, this appears to be an issue as far back as 2015 according to some forums.
Now, however, the only thing I can think of that may or may not have to do with these lights coming on, and I could be wrong considering the first instance was a sensor failure, is the idling. The dealership seemed to be more concerned about the vehicle potentially being on in accessory mode (which is obviously not the case because this would obviously cause a dead battery pretty quickly,) but they did not seem too concerned about me idling the engine for 30 minutes to an hour. After doing some research online, I found, and correct me if I am wrong, excessive idling can potentially cause battery voltage issues and in turn, subsequent error codes. At the same time, I am a bit doubtful that this is the issue because I am sure many of you have idled for a time and never experienced these issues. Additionally, since the pressure senseor valve was the result of the first error code, vehicle idling could not have been the culprit.
As of now, I am still waiting to hear back with results, and the loner, after driving a few miles, has cleared the codes by itself. I should also note, during the second instance, the codes cleared by the time I went to the dealership. In the first instance, they cleared and then came back after a while.
Any ideas? Or, am I on my way to lemon city? I have had a CR-V and Civic, and I have never experienced anything near as critical as this.
Thank you,
The following users liked this post:
DMV703 (05-08-2021)
05-05-2021, 12:17 AM
#2
I can comment on the charging part. The charging system is very adaptive, meaning that it adjust the voltage based on many factors, for example the system tends to go max charging (~14V) during coasting. If everything works as intended, the scenario you mentioned that idling caused insufficient charge would not occur. Perhaps you can check the battery state first, because if the load of the battery is weird, the charging system might be fooled and not able to provide enough charge in time. Low voltage tends to trigger the xmas-tree-lights syndrome.
But if there is a code that does not clear itself, the issue should be addressed first before further debugging.
But if there is a code that does not clear itself, the issue should be addressed first before further debugging.
05-05-2021, 09:31 AM
#3
I suspect that the battery state of charge is the cause. Many owners of Honda products (and others as well) are experiencing this with the reduced driving. The batteries just don't get charged up enough and hold a charge with the lack of use the pandemic has caused. Many owners are now using a battery maintainer when they don't drive often. Cars today have a lot of parasitic drain when not being used to power all kinds of things. I would encourage you to mention this as a possibility to the dealer.
05-05-2021, 06:05 PM
#4
Skeptic
05-08-2021, 07:42 AM
#7
I don't understand that statement. You can't "use" the car very effectively in accessory mode. It won't go anywhere. And why did you expect to be "accused" of it? Are you in the habit of just sitting in the car for long periods with the accessories on? If you're just listing to the audio system or playing with the navigation or infotainment system, you don't have to be in accessory mode.
Regardless, I do not often operate the vehicle's internal electronics in this mode, so this could not have been the reason behind the vehicles malfunction.
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05-08-2021, 07:43 AM
#8
I don't understand that statement. You can't "use" the car very effectively in accessory mode. It won't go anywhere. And why did you expect to be "accused" of it? Are you in the habit of just sitting in the car for long periods with the accessories on? If you're just listing to the audio system or playing with the navigation or infotainment system, you don't have to be in accessory mode.
Regardless, I do not often operate the vehicle's internal electronics in this mode, so this could not have been the reason behind the vehicle malfunctioning.
05-08-2021, 07:54 AM
#9
Dealer said they contacted the Acura tech line and they were told to make an adjustment on the break pedal and that they don't believe there is anything major wrong with the vehicle. I have absolutely no clue what they're talking about, but they said to let them know if the lights come back on. I guess we will see if this "adjustment" makes a difference.
05-08-2021, 10:55 AM
#10
Skeptic
I'm just relaying what one of the service representatives stated. The first question she asked me was if I was using the vehicle in accessory mode. I'm not exactly how literal you need me to be outside of commons sense, but we can go there. So, in other words, she exhibited concern about whether or not I might have been utilizing either the radio, or perhaps talking on the phone for long periods of time while in this particular mode. And whether or not this mode needs to be activated in order to run the nav or whatever is besides the point. This is what she indicated.
Regardless, I do not often operate the vehicle's internal electronics in this mode, so this could not have been the reason behind the vehicle malfunctioning.
Regardless, I do not often operate the vehicle's internal electronics in this mode, so this could not have been the reason behind the vehicle malfunctioning.
Sorry about the condescending tone too.
05-08-2021, 06:55 PM
#11
Hello all,
Owner of a 2021 RDX Advanced, leased. After about 5 months of driving, with only 2,000 miles on the odometer, while I was idling at a store, all of my vehicle's warning lights came on advising on a dealership inspections. At this point, all of the vehicle's systems did not work. Upon bringing the vehicle into the dealership, first, as I expected, I was accused of using the vehicle in accessory mode. After I advised that this was not the case, they inspected it and pulled "DTC C0044-F0 Master Cylinder Pressure Sensor failure." They then replaced the sensor and sent me on my way. Around 700 miles later, the issue comes right back.
Here's the kicker.
They give me a loaner and the loaner lights up the same way, Lol. Now, because the loaner's warning lights lit up: (ABS, ACC, elec parking brake, AWD etc,) when I speak with the dealership over the phone, they're like, "Oh then it must be user behavior." I then instantly realize they must not read these forums because after looking, this appears to be an issue as far back as 2015 according to some forums.
Now, however, the only thing I can think of that may or may not have to do with these lights coming on, and I could be wrong considering the first instance was a sensor failure, is the idling. The dealership seemed to be more concerned about the vehicle potentially being on in accessory mode (which is obviously not the case because this would obviously cause a dead battery pretty quickly,) but they did not seem too concerned about me idling the engine for 30 minutes to an hour. After doing some research online, I found, and correct me if I am wrong, excessive idling can potentially cause battery voltage issues and in turn, subsequent error codes. At the same time, I am a bit doubtful that this is the issue because I am sure many of you have idled for a time and never experienced these issues. Additionally, since the pressure senseor valve was the result of the first error code, vehicle idling could not have been the culprit.
As of now, I am still waiting to hear back with results, and the loner, after driving a few miles, has cleared the codes by itself. I should also note, during the second instance, the codes cleared by the time I went to the dealership. In the first instance, they cleared and then came back after a while.
Any ideas? Or, am I on my way to lemon city? I have had a CR-V and Civic, and I have never experienced anything near as critical as this.
Thank you,
Owner of a 2021 RDX Advanced, leased. After about 5 months of driving, with only 2,000 miles on the odometer, while I was idling at a store, all of my vehicle's warning lights came on advising on a dealership inspections. At this point, all of the vehicle's systems did not work. Upon bringing the vehicle into the dealership, first, as I expected, I was accused of using the vehicle in accessory mode. After I advised that this was not the case, they inspected it and pulled "DTC C0044-F0 Master Cylinder Pressure Sensor failure." They then replaced the sensor and sent me on my way. Around 700 miles later, the issue comes right back.
Here's the kicker.
They give me a loaner and the loaner lights up the same way, Lol. Now, because the loaner's warning lights lit up: (ABS, ACC, elec parking brake, AWD etc,) when I speak with the dealership over the phone, they're like, "Oh then it must be user behavior." I then instantly realize they must not read these forums because after looking, this appears to be an issue as far back as 2015 according to some forums.
Now, however, the only thing I can think of that may or may not have to do with these lights coming on, and I could be wrong considering the first instance was a sensor failure, is the idling. The dealership seemed to be more concerned about the vehicle potentially being on in accessory mode (which is obviously not the case because this would obviously cause a dead battery pretty quickly,) but they did not seem too concerned about me idling the engine for 30 minutes to an hour. After doing some research online, I found, and correct me if I am wrong, excessive idling can potentially cause battery voltage issues and in turn, subsequent error codes. At the same time, I am a bit doubtful that this is the issue because I am sure many of you have idled for a time and never experienced these issues. Additionally, since the pressure senseor valve was the result of the first error code, vehicle idling could not have been the culprit.
As of now, I am still waiting to hear back with results, and the loner, after driving a few miles, has cleared the codes by itself. I should also note, during the second instance, the codes cleared by the time I went to the dealership. In the first instance, they cleared and then came back after a while.
Any ideas? Or, am I on my way to lemon city? I have had a CR-V and Civic, and I have never experienced anything near as critical as this.
Thank you,
The following users liked this post:
DMV703 (05-08-2021)
The following users liked this post:
DMV703 (05-09-2021)
05-09-2021, 10:41 AM
#14
I will make sure I do that. That's probably what's happening lol. Thanks for the info. I'm still learning. I had a 2009 Honda Accord Coupe prior to this RDX so I was behind on technology lol
05-09-2021, 08:02 PM
#16
RDX ILX TSX
I just purchased a 2021 Acura RDX advanced and sometimes my car will automatically go into accessory mode (when I press on the pedal And press start engine) for whatever reason. I have to keep pressing start engine more than once (happened twice) to get the car to start. I also notice rough idling (a bit shaky to be a new car). I hope I don’t end up in lemon city myself because with less than 1k miles I already feel uncomfortable although I’m trying to think positive about the car. I’m hoping I just have to get used to this new car and up to date technology in a vehicle. Had I noticed this during my test drive I probably would have went with the Lexus (my 2nd choice).
Hope you enjoy your RDX. I absolutely love mine after 12,000 miles and never get tired of driving it.
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DMV703 (05-09-2021)
05-09-2021, 08:53 PM
#17
Interesting - this also happens with my 2020 Advance and I thought it was just my imagination. Doesn't happen all the time, but randomly during a start-up, I have to keep pressing the brake pedal and then the Start Button until I finally get a spark. I don't have any rough idling that you're experiencing but yeah - the accessory mode issue confuses me. Would be great if someone has an answer for this, or else I will be consulting with my dealer on my next service.
Hope you enjoy your RDX. I absolutely love mine after 12,000 miles and never get tired of driving it.
Hope you enjoy your RDX. I absolutely love mine after 12,000 miles and never get tired of driving it.
Enjoy your new whip! It really is a nice car!
07-12-2022, 02:47 PM
#19
2nd Gear
Join Date: Jun 2022
Age: 54
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Low brake fluid will cause all systems related to it to show failure.
Took mine in today and it was only low brake fluid at 11k miles. All systems tied to the brakes will show failure as a safety precaution. Its a very sensitive system.
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