Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 07-05-2022, 08:29 AM   #1
Junior Member
Join Date: Feb 2017
Posts: 8
ONAN 5500 Running Issue

Running down the road the other day and fired up the onan 5500 gas generator. Started fine and ran for approximatly 20 minutes then cut off. No Problem

Today at RV Park TUrned off pedistal
Started right up and ran for 20 minutes and died
....Oil Check good ... plenty of fuel.
After around 30 minutes i was able to restart

Any sugesstions as to the cause and remedy?
ucaatexas is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-05-2022, 08:49 AM   #2
Senior Member
Diesel-Lover's Avatar
Join Date: Nov 2002
Location: OH
Posts: 816
IF fuel levels are within the drinking straw range and you have eliminated that, then perhaps it is a heat related issue, as in the generator getting too hot to keep running, so it shuts itself down?

I had a fuel level in the main tank issue in one of my RVs and finally figured out that the generator did not run past 3/4 full RV tank! Went to Camping World they just pushed the straw down farther into the tank and all was well to the 50 percent fuel in the tank level. Once out in Canyon lands (105 plus temps) the generator kept cutting out and that was heat related as per the neighbor who suggested I run it with the compartment door open next time, and well it worked!
RUSTIC is good.
Kudos to those who make Local, State & Federal Parks & Campgrounds possible and to those picking up the slack by Providing Private Campgrounds.
Diesel-Lover is offline   Reply With Quote
Old 07-05-2022, 08:49 AM   #3
Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 5,108
There is another discussion which mentions this in the "MH General Discussions" room you might want to check out.
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
LETMGROW is offline   Reply With Quote
Old 07-05-2022, 08:51 AM   #4
Community Moderator
Join Date: Aug 2018
Location: Full timing
Posts: 3,259
Originally Posted by ucaatexas View Post
Running down the road the other day and fired up the onan 5500 gas generator. Started fine and ran for approximatly 20 minutes then cut off. No Problem

Today at RV Park TUrned off pedistal
Started right up and ran for 20 minutes and died
....Oil Check good ... plenty of fuel.
After around 30 minutes i was able to restart

Any sugesstions as to the cause and remedy?
Did the generator give any codes? If so, what was the code?

Look here for your manual:
2018 Road Warrior 427/2016 golf cart (gas) sold
2013 Can Am Spyder RT Limited
2017 Ram 3500 w/Aisin w/4:10
2 Dachshunds DJ (RIP 9-12-19) & Joey (RIP 5-14-21)
hamm2018 is offline   Reply With Quote
Old 07-05-2022, 03:39 PM   #5
Senior Member
NXR's Avatar
Join Date: Mar 2019
Posts: 3,611
The next time it shuts down, go outside and pull the generator cover off. There is a light on the switch. It will blink out a code if the generator detected a fault.

From the Onan service manual:

The genset controller provides extensive diagnostics by causing the status indicator light on the Control Switch to blink in coded fashion. Following a fault shutdown, the indicator light will repeatedly blink 2, 3 or 4 blinks at a time.

• Two blinks indicates a low oil pressure fault.

• Three blinks indicates a service fault. Press Stop once to cause the two-digit, second-level fault code to blink. (Pressing Stop again will stop the blinking.)

The two-digit code consists of 1, 2, 3, 4 or 5 blinks, a brief pause, and then 1 to 9 blinks. The first set of blinks represents the tens digit and the second set of blinks the units digit of the fault code number.

For example, Fault Code No. 36 appears as:

blink-blink-blink — pause — blink-blink-blink-blink-blink-blink — long pause — repeat

• Four blinks indicates that cranking exceeded 30 seconds without the engine starting.

• Note: Fault Code Nos. 3 and 4 are first level faults. Avoid interpreting them as second-level

Fault Code Nos. 33 and 44, which have purposely not been assigned as fault codes.

• Fault Code 36 means "I shut down but I have no idea why!". That means none of the monitored conditions, such as low oil pressure, caused the shutdown. It can be just fuel starvation.

Restoring Fault Code Blinking – The fault code stops blinking after five minutes (15 minutes, Series HGJAA & HGJAD). Press Stop three times within five seconds to restore blinking. Note that the last fault logged will blink even after the condition that caused the shutdown has been corrected."

Hmmm, that last sentence says a fault code may still be blinking, doesn't it?

Onan Generator Fault Code List
Code 2 - Low Oil Pressure
Code 3 - Service Check
Code 4 - Over Crank
Code 12 - Over Voltage
Code 13 - Under Voltage
Code 14 - Over Frequency
Code 15 - Under Frequency
Code 19 - Governor Actuator Overload
Code 23 - Low Oil Pressure Cutoff Switch
Code 27 - Voltage Sense Error
Code 29 - High Battery Voltage
Code 31 – Overspeed
Code 32 - Low Cranking Speed
Code 35 - Control Card Failure
Code 36 - Engine Stopped
Code 37 - Invalid Generator Set Configuration
Code 38 - Over Current (Field Overload)
Code 41 - Generator Rotor
Code 42 – Processor
Code 43 - Processor Fault Code.
Code 45 - Speed Sense
Code 47 – Ignition
Code 48 - Generator Field Sense
Code 51 – Processor
Code 52 - Fuel Injector
Code 54 - MAT Sender
Code 56 - MAP Sender
Code 57 - Over Prime
Code 58 - Exhaust Gas Temperature Shutdown
Code 81 - Exhaust Gas Temperature Sensor Open
Code 82 - Exhaust Gas Temperature Shorted
2020 Forest River Georgetown GT5 34H5
NXR is offline   Reply With Quote
Old 07-05-2022, 04:22 PM   #6
Junior Member
Join Date: Jan 2022
Posts: 18
Gary2220 is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
RV Onan 5500 QG generator will not stay running DAPeters General Discussion 20 10-13-2019 08:16 PM
Onan 5500 won’t stay running Jenkins Toy Haulers Discussion 2 08-20-2019 12:14 PM
Onan 5500 not running 2 a/c in TH Rcmike Winnebago Industries Owner's Forum 12 10-21-2016 08:46 PM
Onan 5500 Generator won't stay running DLMCGOV RV Systems & Appliances 6 08-01-2016 08:48 PM
Onan QG 5500 Quit Running GreggTracy RV Systems & Appliances 16 07-21-2013 09:28 PM

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 02:34 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.