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Old 02-11-2016, 08:17 PM   #1
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Location: Tri Cities Washington
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Diagnostic Trouble Code and Gas Cap

We've just purchased a 2003 Allegro Bay motorhome on a W22 Workhorse / Chevy Chassis. When starting from cold I got a reduced power light along with a service engine soon alarm. After warming the engine a bit and shutting down then restarting, the reduced power light was gone and the engine ran well. I plugged into the OBDII port and found a code P1518. It is a manufacturer specific code so my book doesn't list it. Can anybody tell me the definition of the code?

At our first fueling I found the coach has the wrong gas cap and is not sealing the filler neck. I'm hoping this is the cause of the fault code. I'll have to find a replacement cap tomorrow. Does anybody know a part number or other application I can use to get the right cap?

I've come to this forum for help with our previous RVs, and the help is very much appreciated.


2003 Allegro Bay 36DB, Workhorse W22 Chassis
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Old 02-11-2016, 08:43 PM   #2
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Google search of irv2.com finds a whole bunch of information on that code.

It's not the gas cap, it's a throttle code, that's why it reduced the power.


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Old 02-13-2016, 06:25 PM   #3
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You were right tderonne. After locating the throttle actuator control module, I pulled one of the multi-pin connectors, rinsed it with a spray of electronic cleaner and reconnected. The reduced power and the service engine soon lights are gone. Thanks for the help.
2003 Allegro Bay 36DB, Workhorse W22 Chassis
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Old 02-13-2016, 10:07 PM   #4
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re: locating a new gas cap; take yours to a auto parts store and tell them you want a new one to replace it. NAPA, O'Rilleys, etc.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"
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Old 02-13-2016, 10:29 PM   #5
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A little bit of advice for a new owner. I've had my W22 since new and have put 80,000 miles on it.

I'd suggest you clean your MAF sensor, replace the air filter, spark plugs and spark plug wires.

You may also have a problem with your dash gauges built by Actia. Occasionally when you are driving all the dash lights will come on along with the loud alarm and all the gauges will peg.

That will last about 5 seconds and then everything will return to normal.

It is a problem with the Actia gauge and you will learn to ignore it after it scares the heck out of you a couple times.

Other than that you will be very happy with the power from the 8.1.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
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Old 02-14-2016, 07:47 AM   #6
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I had the exact same issue. Went to Napa and matched the cap, cleared the code and only to find it would return. Sometimes in 50 miles, sometimes just at start up. I had changed all sensors nothing helped. I called and got a Fleetwood gas cap from Ultra RV products. It solved the problem, they match cap with the year and model of coach. I compared the caps after the fix to see if I could see a difference. The over the counter cap from Napa has a O ring seal [gasket] for tank, the Fleetwood cap has a flat round seal which extends further outward on the cap and giving it a good seal. It was costly but it solved the issue and it [limp mode] has never returned as well as no codes. Good luck with yours, let us know your fix.

Bruce & Nancy
FMCA F280542
2004 Bounder 35E
US Navy Vet.
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