JohnnyDiesel Posted August 12, 2021 Share Posted August 12, 2021 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. Link to comment Share on other sites More sharing options...
John Haggard Posted August 12, 2021 Share Posted August 12, 2021 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. 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 Link to comment Share on other sites More sharing options...
JohnnyDiesel Posted August 12, 2021 Author Share Posted August 12, 2021 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? Link to comment Share on other sites More sharing options...
John Haggard Posted August 12, 2021 Share Posted August 12, 2021 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. Link to comment Share on other sites More sharing options...
GoSkeeterPopGo Posted August 12, 2021 Share Posted August 12, 2021 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? Link to comment Share on other sites More sharing options...
John Haggard Posted August 12, 2021 Share Posted August 12, 2021 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. Link to comment Share on other sites More sharing options...
ko7pjim Posted August 12, 2021 Share Posted August 12, 2021 On my 2004 Camelot it was low coolant. The coolant purge tank leaks a bit and needs to be replaced. Link to comment Share on other sites More sharing options...
Hancoman Posted August 13, 2021 Share Posted August 13, 2021 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 Link to comment Share on other sites More sharing options...
John Haggard Posted August 13, 2021 Share Posted August 13, 2021 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 🤔 ??? Link to comment Share on other sites More sharing options...
Hancoman Posted August 13, 2021 Share Posted August 13, 2021 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 Link to comment Share on other sites More sharing options...
John Haggard Posted August 13, 2021 Share Posted August 13, 2021 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. Link to comment Share on other sites More sharing options...
Hancoman Posted August 13, 2021 Share Posted August 13, 2021 They did not turn the light out. Was not a Cummins shop but they did have the computer program for the codes. I eventually will have the light turned off Link to comment Share on other sites More sharing options...
JohnnyDiesel Posted August 13, 2021 Author Share Posted August 13, 2021 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 Link to comment Share on other sites More sharing options...
Chuck B 2004 Windsor Posted August 13, 2021 Share Posted August 13, 2021 The warning light is on for a reason. Ignoring it will only mean a lighter wallet down the road. Chuck B 2004 Windsor Link to comment Share on other sites More sharing options...
John Haggard Posted August 13, 2021 Share Posted August 13, 2021 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 Link to comment Share on other sites More sharing options...
Chuck B 2004 Windsor Posted August 13, 2021 Share Posted August 13, 2021 But, what about "If So"? Your Choice Chuck B 2004 Windsor Link to comment Share on other sites More sharing options...
John Haggard Posted August 13, 2021 Share Posted August 13, 2021 22 minutes ago, Chuck B said: But, what about "If So"? Your Choice Chuck B 2004 Windsor You stated an always, absolute failure down the road . That's not true. Link to comment Share on other sites More sharing options...
planodp Posted August 14, 2021 Share Posted August 14, 2021 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. Link to comment Share on other sites More sharing options...
John Haggard Posted August 14, 2021 Share Posted August 14, 2021 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. Link to comment Share on other sites More sharing options...
vanwill52 Posted August 14, 2021 Share Posted August 14, 2021 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. 2 Link to comment Share on other sites More sharing options...
Chuck B 2004 Windsor Posted August 14, 2021 Share Posted August 14, 2021 Hi John H, interesting. Chuck B 2004 Windsor Link to comment Share on other sites More sharing options...
JohnnyDiesel Posted September 2, 2021 Author Share Posted September 2, 2021 Thanks for all your input. Trouble turned out to be the barometric pressure sensor. Put in the updated version and voila, warning light is OUT! Link to comment Share on other sites More sharing options...
CLIFF918 Posted March 25, 2022 Share Posted March 25, 2022 On 9/2/2021 at 5:28 PM, JohnnyDiesel said: Thanks for all your input. Trouble turned out to be the barometric pressure sensor. Put in the updated version and voila, warning light is OUT! Johnny; I have a similar, if not the same, problem. My low coolant light has been on since I bought the coach and previous (original) owner said it has been on for years with no issues. I don't like things that don't work and should, especially warning lights. The surge tank was in questionable condition, not leaking yet, so I purchased and installed a new aluminum tank and new sensor. I also replaced the two 5/16 lines that go into the top of the tank they were not in good condition at all. All other rubber lines, hoses are good. The low coolant light is still on @#$#. I see where you replaced a Barometric sensor and your light went out. I have a 2002 Diplomat with the ISC 8.3. If this is the same where do I look for the barometric sensor?? Thanks in advance Cliff Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now