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Old 04-27-2015, 08:36 PM   #1
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Location: So Cal
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The good aaaaaand the bad!!!

First the good part, did about 350 miles today, rides and drives as advertised, not at all tired great coach. Very happy!!!!

BUT, I got a check engine light going up hill and the light would go out on the flat and downhill. I checked oil, trans fluid and topped off the coolant. All of the gauges read what I would consider normal. Started it up no light and on the road again! 1/2 hr later same light, driving 65, no loss of power nothing appears to be amiss. Stopped checked coolant all is well back on the road no light. A little later same thing.

I had a similar thing in my old MH and it was about a quart low on coolant and that set off the sensor. I unplugged the connector at the coolant tank and it didn't put the light out. When I plugged t back in I noticed the temp gauge started moving around from about 175 to about the 200 mark. It had been sitting pretty steadily on 200 the whole time and I had taken that to be normal. So now I have a temp gauge that works and a check engine light that comes and goes.

Any suggestions??? Thoughts??? Good wishes???

Did I tell you that I really like this MH

Oh yeah, we're in a KOA in Beaver, UT. Supposed to get to 31 tonight.


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Old 04-27-2015, 10:55 PM   #2
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You don't specify year, make, model, engine make, engine model, electronic injection, etc. I assume it's an Alpine.

On electronic controlled engines, the Check Engine light can simply be a report to say that there was an error in exhaust emission reporting for a period of time. It may also be reporting that because exhaust emissions cannot be correctly read because of a sensor failure, fuel injection is being provided at default values, which may not necessarily provide optimum power or mileage, but will let the engine operate safely until you can have the issue resolved.


Jim & Kate
2016 Creekside 23RKS, 2014 Ram 1500 Eco Diesel
1995 Monaco Dynasty 36', 2005 Honda Pilot
Canada, eh?
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Old 04-27-2015, 11:12 PM   #3
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Since this is the Alpine Coach forum, it is known that the OP owns an Alpine Coach. His previous posts tell us it is a 2005 model.
'99 Alpine Coach
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Old 04-27-2015, 11:23 PM   #4
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What was the check engine light code?
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
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Old 04-28-2015, 07:48 AM   #5
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I have had the same thing - engine light comes on going up hills. I replaced the fuel/water separator filter. The filter was restricting the fuel flow. I suggest you enter your MH info in your profile. Good luck.
2005 38FDTS
2011 Ford Edge
Fredericksburg, TX
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Old 04-28-2015, 08:52 AM   #6
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Ditto! You should notice some slight hesitations at first which gets worse as you keep driving. The greater the load the more hesitations you'll get and eventually start losing power.
Bob Bowers (Surprise, AZ)
2003 Alpine Coach 40' FDTS
2014 Jeep Cherokee Lattitude
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Old 04-28-2015, 04:11 PM   #7
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OK--lots of reasons for check engine light. Believe there is a way to get the Cummins ECM to "blick" the codes but suggest going to Cummins shop so they can scan it. It can gets kind of expensive to diagnose check lights with new parts...
Old Scout
2003 40' MDTS
Garden Ridge, Texas
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Old 04-28-2015, 05:35 PM   #8
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Thanks for all the replies, I've made it from Idaho to Vegas on my way home to CA. I've been dealing with KOA wifi and a lack of computer skill so I haven't gotten around to posting my MH info or updating my profile. I will update things when I get home, but for now:

2005 Alpine


400 Cummins

So far very pleased with the coach, I am really pleased with the operation of the brakes. I like the feel of the hydraulics, maybe its the pedal placement or just the car type feel. Aside from a few check engine light worries it has performed flawlessly. Tomorrow morning we will head out on the last leg of our trip home and then you guys are really in for it!!!

Thanks for all the help so far and I will be back picking your brains before you know it.


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