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Limp mode 2019 aspec

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Old 07-23-2018, 06:21 AM
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Limp mode 2019 aspec

I was driving on the highway about 75mph and I was trying to pass someone. Then my engine cutout and the engine light came on. I was unable to accelerate I believe itís called ďlimpĒ mode. I had to pull over, shut the car off and turn it back on and everything is fine.

Has as anyone had this issue? I use premium gas, and the car has 1500 miles on it.
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Old 07-23-2018, 08:56 AM
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High pressure fuel pump? Let us know if you get it diagnosed. Thanks
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Old 07-23-2018, 10:56 AM
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This is where an ODB2 scanner would be nice to have.
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Old 07-23-2018, 05:39 PM
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Which ODB2 scanner would be recommended for the new RDX?
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Old 07-24-2018, 09:10 AM
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I usually can use my navi screen to drill down see the code for my 1st Gen RDX the last time I went into limp mode (failed i-Vtec solenoid, fixed under powertrain warranty)
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Old 07-24-2018, 09:26 AM
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Originally Posted by windycitycy View Post
Which ODB2 scanner would be recommended for the new RDX?
any scanner will work.
cheapie ones from harbor freight work.

OBDII bluetooth dongles also work...which then you can pair to a device and read the info with an accompanying app
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Old 07-31-2018, 02:41 PM
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Acura had the car for 4 days, no codes when the hook the ODB2 scanner and there were no codes. they called a couple of other dealers and acura support to see if its a common problem or its a freak thing. They had another 19 RDX that had the same limp mode issue and they determined that it was there was a bad plug, which they checked on my car. so i basically got a 4 day car wash.

the 18 RDX loaner felt like a $40K CRV compared to the 19 RDX
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Old 07-31-2018, 04:51 PM
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At least they were able to fix it without an engineer's help. I couldn't imagine driving a 2nd a 2nd gen rdx after experiencing the 3g lol.
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Old 07-31-2018, 07:37 PM
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Originally Posted by 2019aspec View Post
the 18 RDX loaner felt like a $40K CRV compared to the 19 RDX
Tell us more. Less power? Firm ride?
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Old 07-31-2018, 08:03 PM
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The 2018 trunk seemed smaller since I load it up for weekend trips and I couldnt hold as much, handling was decent but might have been because the car didnít accelerate as quickly

One thing better in the 18 was the trans shifted smoother. Iím used to driving stick so smoothness wasnít a priority.

They definitely did a total redesign on the the interrior for 2019, all for the better. I never considered an RDX until I saw the 19. Hopefully it lasts. I have 184k on a 2011 outback and 142k on an 09 MDX both had normal maintenance and no major problems
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Old 07-31-2018, 08:54 PM
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Originally Posted by 2019aspec View Post
Acura had the car for 4 days, no codes when the hook the ODB2 scanner and there were no codes. they called a couple of other dealers and acura support to see if its a common problem or its a freak thing. They had another 19 RDX that had the same limp mode issue and they determined that it was there was a bad plug, which they checked on my car. so i basically got a 4 day car wash.

the 18 RDX loaner felt like a $40K CRV compared to the 19 RDX
You do know that the Gen 2 RDX was basically a well dressed CR-V with the Accords bigger engine, not the Accordís smaller one. Although the Gen 3 RDX also sports the Accordís bigger engine, it is entirely on itís own architecture.
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Old 08-08-2018, 08:20 PM
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Sorry to resurrect this thread, but.....

i had had this experience tonight. I have had the car a little over a week, about 800 mile s so far. I turned right on red and someone was headed my way pretty quick. I gunned the engine and thought I saw a little black smoke out the back. Next thing I knew there was no acceleration and the check engine light was flashing. I got to where I could pull over safely, turned the car off, let it set a minute, then started back up. Ran fine after that.

A couple of things I noticed. The RPMs seemed to be above 6000 and it was almost like I tried the hard acceleration etween shifts. I was in sport mode when this happened.

My dealer is about 150miles away, so I am just going to watch what is happening.

Just wanted to let folks here know in case it happens some more.

Billy

Forgot to mention, I have a SH AWD, Advance.

Last edited by billyt1963; 08-08-2018 at 08:22 PM. Reason: More information
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Old 08-10-2018, 09:19 AM
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let us know if they find anything, i was also in sport mode when it happened. i didn't notice any smoke, but i'm in NJ and the air is always off color...i've put 2000 miles on since it happened and so far so good.
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Old 08-10-2018, 09:41 AM
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who was that guy that was infamously familiar with the TLX and limp mode?


Yeah, buy a bluetooth scanner on amazon and pair it to your phone...
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Old 08-10-2018, 01:36 PM
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Originally Posted by billyt1963 View Post
A couple of things I noticed. The RPMs seemed to be above 6000 and it was almost like I tried the hard acceleration etween shifts. I was in sport mode when this happened.
Then Id suggest it was probably an over rev situation and the temp limp mode was a result. If it didnt stay in limp more and/or didnt show any codes Id also suspect it wasnt anything major. Limp mode is often in place so you dont do any damage by over revving or over boosting the engine.

I have an OBD reader and I havent noticed anything odd during normal driving. I would also be curious to see if the ECU limits boost under certain circumstances like many past turbo cars I have owned does. Some of them would limit boost if the car wasnt up to operating temps or low on gas.

Billy when this limp mode happened, was the car fueled and up to temps?

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Old 08-10-2018, 03:04 PM
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Originally Posted by MTD View Post
.

Billy when this limp mode happened, was the car fueled and up to temps?
When you say fueled I assume you are asking how much gas in the tank? It was probably between 1/2 to 3/4.
I had just driven about 20-30 minutes, so it should have been sufficiently warmed up.

Something odd I have noticed Since this happened. I donít remember the auto-stop kicking in lately. I am overly sensitive to it now, so I will notice when it does kick in.

Thanks for the explanation. Being new to a turbocharged vehicle, I am sure I am going to have more learning to do.

Billy
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Old Yesterday, 07:21 AM
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I also had this issue accelerating on a highway ramp, I accelerated to get to traffic speed, then engine light flash and limp mode. Pulled over and restart cleared it. I dropped the car to the dealer and they did not get any code. But they are hanging on to the car and asking Acura about it.

Stuck with a 17 TLX loaner, my RDX is so much batter.
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Old Yesterday, 07:29 AM
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Originally Posted by MTD View Post
Then Id suggest it was probably an over rev situation and the temp limp mode was a result. If it didnt stay in limp more and/or didnt show any codes Id also suspect it wasnt anything major. Limp mode is often in place so you dont do any damage by over revving or over boosting the engine.

I have an OBD reader and I havent noticed anything odd during normal driving. I would also be curious to see if the ECU limits boost under certain circumstances like many past turbo cars I have owned does. Some of them would limit boost if the car wasnt up to operating temps or low on gas.

Billy when this limp mode happened, was the car fueled and up to temps?
perhaps the terminology is wrong?
I dont think it's an "over-rev" condition... as that indicates a physical condition of the pistons kissing the valves.

perhaps, "over-boost" would be the more appropriate term?
where there is TOO much air for the turbo...as the condition is ripe for it..."in acceleration"

in any case, an OBDII reader will tell if the car is overboosting..
I doubt the car is limiting boost until it goes into limp mode..

which means something like an overboost condition can trigger the limp mode thus limiting boost...

Last edited by justnspace; Yesterday at 07:32 AM.
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Old Yesterday, 08:00 AM
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Most all of these problems are due to an undercharged battery. Most of these problems happen to newly purchased cars. The cars sit around and are moved around in the dealership without every really being driven. The battery goes slightly low. This is enough to cause all sorts of sensors to malfunction. The solution is very simple. Charge the battery on a slow charger overnight. That's also the reason the vehicle won't set a code. There is no malfunction. The problem is low voltage, which won't set a code. So purchasing an OBDII scanner won't really help in this situation. If you do nothing, the problem tends to go away anyway.
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Old Yesterday, 09:44 AM
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Originally Posted by Crashmaster View Post
Most all of these problems are due to an undercharged battery. Most of these problems happen to newly purchased cars. The cars sit around and are moved around in the dealership without every really being driven. The battery goes slightly low. This is enough to cause all sorts of sensors to malfunction. The solution is very simple. Charge the battery on a slow charger overnight. That's also the reason the vehicle won't set a code. There is no malfunction. The problem is low voltage, which won't set a code. So purchasing an OBDII scanner won't really help in this situation. If you do nothing, the problem tends to go away anyway.
Most of these cars are straight from the factory. This would not be the issue.
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Old Yesterday, 11:15 AM
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Originally Posted by Crashmaster View Post
Most all of these problems are due to an undercharged battery. Most of these problems happen to newly purchased cars. The cars sit around and are moved around in the dealership without every really being driven. The battery goes slightly low. This is enough to cause all sorts of sensors to malfunction. The solution is very simple. Charge the battery on a slow charger overnight. That's also the reason the vehicle won't set a code. There is no malfunction. The problem is low voltage, which won't set a code. So purchasing an OBDII scanner won't really help in this situation. If you do nothing, the problem tends to go away anyway.
My limp mode happened right after I had driven 40 miles to pick someone up and I had ~1000 miles on the odometer. I would assumed the car is all charged up and all break-in by then.
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Old Yesterday, 05:22 PM
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Has anyone that has experience limp mode noticed if you auto idle is still working?

i had limp mode happen a week ago and have not noticed auto idle since. I haven’t done much testing yet, haven’t even told the dealer.

Billy
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Old Yesterday, 05:30 PM
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Auto idle is still working for me.

I just got the car back from service after they worked with it for 3 days. They can't find any code and did a bunch of test after talking to Acura and still come back with nothing. Acura actually told them it's the VSS causing limp which the service manager didn't believe because it's the engine light that was blinking and I had to pull over to get it clear out. All he can do is log this instance in the Acura network. Maybe enough of us report in they will take this seriously.
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Old Yesterday, 06:03 PM
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Auto Idle works for me, but if you figured out how to shut it off permanently, a lot of people would be interested.
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Old Yesterday, 06:20 PM
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Sorry to hear you guys are having this trouble. Does the engine shut down completely, or is it just a brief loss of power?
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Old Yesterday, 06:29 PM
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It is just a loss of power. Car will just go between 30-40 and the check engine light flashes.

I found out after it happened, the owners manual says the check engine light flashes, stop the car for 10 minutes. I stopped for 1 minute tops. Haven't had that trouble again, just no auto idle.

Billy
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