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"Warning" light in dash stays on


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I just bought a 2001 Executive. I noticed a red "warning" light was always on. The previous owner said it had been on for years and nobody knew why.
The owners manual eluded to a possible low fluid condition but I find everything is full. Anyone have this light on their rig?
My coach has a Cummins ISM 500 and I can't identify a troubleshooting method to zero in the cause of the light.
I checked for DTCs and there are none. I checked the wiring diagram and see that the "warning" light is triggered by the engine ECM.
The coach runs well. I drove it home 350 miles no issues.
Thanks in advance.

PXL_20210811_131445678.jpg

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3 minutes ago, JohnnyDiesel said:
I just bought a 2001 Executive. I noticed a red "warning" light was always on. The previous owner said it had been on for years and nobody knew why.
The owners manual eluded to a possible low fluid condition but I find everything is full. Anyone have this light on their rig?
My coach has a Cummins ISM 500 and I can't identify a troubleshooting method to zero in the cause of the light.
I checked for DTCs and there are none. I checked the wiring diagram and see that the "warning" light is triggered by the engine ECM.
The coach runs well. I drove it home 350 miles no issues.
Thanks in advance.

PXL_20210811_131445678.jpg

Code for my ISM 500 showed a bad 

For mine

Barometric pressure sensor. 

And an updated wiring harness.

$260 diagnosis and installation 

Took 20 minutes.

More power certanly 

 

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7 minutes ago, John Haggard said:

Code for my ISM 500 showed a bad 

For mine

Barometric pressure sensor. 

And an updated wiring harness.

$260 diagnosis and installation 

Took 20 minutes.

More power certanly 

 

Thanks John, interesting. Do you know the fault code number and the new part number by chance?

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45 minutes ago, JohnnyDiesel said:

Thanks John, interesting. Do you know the fault code number and the new part number by chance?

Sorry

No

A certified Cummins service center just east of Morgantown West Virginia  Down a hill below a pilot station. On the old state route 

 

Cost to Checked for codes, $60. Erased the 1. Code and replaced the harness and Barometric pressure sensore.

Total bill listed above.

 

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John, 

That is interesting information.  My 2001 HR Endeavor has the same "warning" light and on occasion it will flicker or stay on for a short period of time like when driving up a steep hill.  I thought it was also connected to fluid levels such as coolant and hydro.  One time I found the coolant a bit low, topped it off and problem solved.  However you now have me thinking it could be a bad Barometric Pressure sensor....which somehow relates to "engine power"???

At times, I feel my 330hp engine should have more power, so I am wondering if I should have this checked?  I will be passing thru Morgantown, WV in Sept on my wat to Colorado/South Dakota, so maybe I should swing in there and see if they can diagnose?

What wiring harness was upgraded/replaced?

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6 minutes ago, GoSkeeterPopGo said:

John, 

That is interesting information.  My 2001 HR Endeavor has the same "warning" light and on occasion it will flicker or stay on for a short period of time like when driving up a steep hill.  I thought it was also connected to fluid levels such as coolant and hydro.  One time I found the coolant a bit low, topped it off and problem solved.  However you now have me thinking it could be a bad Barometric Pressure sensor....which somehow relates to "engine power"???

At times, I feel my 330hp engine should have more power, so I am wondering if I should have this checked?  I will be passing thru Morgantown, WV in Sept on my wat to Colorado/South Dakota, so maybe I should swing in there and see if they can diagnose?

What wiring harness was upgraded/replaced?

That wiring wire harness was a recall from Cummins years ago. 

It attached in line to the Barometric pressure sensor .

It's a long time family Cummins service center that takes walk ins 

Off I-68 behind Pilot on the North side 

They said before they ran the codes that the light could indicate any one or more of 100 issues.

Fortunately 

This was a simple fix. 

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I also have 2001 executive with the 500 hp Cummins with the warning light on, had it in the shop they checked the codes found nothing. Test drove the coach no change they said they would continue to try and track down the cause but we’re not hopeful and I was already at 1000 bucks , so I said I was good. Since then have driven cross country and back with no problems. That’s my 2 cents

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9 minutes ago, Hancoman said:

I also have 2001 executive with the 500 hp Cummins with the warning light on, had it in the shop they checked the codes found nothing. Test drove the coach no change they said they would continue to try and track down the cause but we’re not hopeful and I was already at 1000 bucks , so I said I was good. Since then have driven cross country and back with no problems. That’s my 2 cents

So what did they do for $1,000  if there were no codes 🤔 ???

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There were codes that they were chasing down, it’s been a year so I can’t remember what they were, I have the paper work in the coach but it is in the storage lot. It is very hot and smokey in Seattle so I am staying put for a couple days I will look ln a couple days

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2 minutes ago, Hancoman said:

There were codes that they were chasing down, it’s been a year so I can’t remember what they were, I have the paper work in the coach but it is in the storage lot. It is very hot and smokey in Seattle so I am staying put for a couple days I will look ln a couple days

So could they erase the codes and turn the light off 🤔 ?

Most Cummins technicians can. 

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12 hours ago, Hancoman said:

There were codes that they were chasing down, it’s been a year so I can’t remember what they were, I have the paper work in the coach but it is in the storage lot. It is very hot and smokey in Seattle so I am staying put for a couple days I will look ln a couple days

Thanks Tom, I'll wait for your update.

John

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33 minutes ago, Chuck B said:

The warning light is on for a reason.  Ignoring it will only mean a lighter wallet down the road.  Chuck B 2004 Windsor

Not necessarily 

Not always 

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I have a 04 Executive also with ISM 500. My warning light have been come on and off now for 2 years since I own the coach. It was doing the same for previous owner. I also don't have a code. I know on a car there are soft code and hard code. Soft code you can see it on the scanner but will not turn on the check engine light. On the other hand hard code will set the check engine light. Been looking for the issue and still haven't found it. I don't have any doubt that the coach will take me to where ever I want to go.

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11 minutes ago, planodp said:

I have a 04 Executive also with ISM 500. My warning light have been come on and off now for 2 years since I own the coach. It was doing the same for previous owner. I also don't have a code. I know on a car there are soft code and hard code. Soft code you can see it on the scanner but will not turn on the check engine light. On the other hand hard code will set the check engine light. Been looking for the issue and still haven't found it. I don't have any doubt that the coach will take me to where ever I want to go.

Many owners will tell you that a bad or contaminated low coolant indicator will send a code.

Even though the coolant is and was adequate. 

Now that's one case where you could drive for years without issues.

I do hate to have a dash light on.

But with the Barometric pressure sensor bad 👎 , and everything up to snuff.

And running good. 

It took me 18 months to get into the correct shop with the right tech.

He did tell me, realy that I may notice a little more power at high altitudes climbing hills.

But many choose not to spend the $$$s

To install the new sensor. 

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As someone noted, the Warning light comes on for a large number of (often not related) reasons.  In my 2000 Dynasty ISC-350, the warning light had been on for years.  I have the Silverleaf VMS-PC and its diagnostics reported "Power supply voltage invalid".  A Cummins tech could not read any code.  Several years later, the ECM shut down and coach had to be towed to replace the ECM.  It turned out the "Power supply voltage invalid" was correct.  It was referring to the internal power supply of the ECM, but Cummins could not read a code.  Once the ECM was replaced, the warning light extinguished.

I wish I could have gotten an answer from Cummins before the ECM crapped out totally.  Even though the VMS-PC picked up the code, their system does not correspond one-to-one with Cummins fault codes.

I have also seen the warning light come on momentarily under full throttle when fuel filters were just beginning to clog, and stay on permanently when the electrode in the coolant tank became corroded.  There are so many reasons for it to come on that if you can't get the code read, it does not tell you much.  It can be signaling something very serious...or not.

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