RV Generator Repair Houston: Onan, Cummins & Mobile RV Generator Service

Most RV generators don’t die on the open road. They die in the driveway. A coach sits through a Houston summer with half a tank of E10 gasoline, nobody runs the Onan for three months, and the first time you hit the start switch before a trip to Galveston it cranks, coughs and quits. If that sounds familiar, you need RV generator repair in Houston, and you need someone who works on RV generators specifically, not just RVs in general.

Our editorial team built this guide from the 15 RV generator repair shops and mobile RV technicians in the Repairior Houston directory. We checked each against its public listing and website and read through what customers actually say about generator work. Below you’ll find who to call, what the common failures are, what repairs usually cost, and when a mobile tech makes more sense than towing the coach to a shop.

15 RV Generator Repair Companies in Houston, TX

The list starts with shops that do the heavier generator work, including factory Cummins service, then moves to full-service RV repair centers and finishes with mobile technicians who come to your storage lot, driveway or RV park.

See every RV generator repair company in Houston, TX →

Compare Houston RV Generator Repair Options

The right call depends on three things: whether the generator is still under warranty, whether it is gas, diesel or propane, and whether your RV can be moved. This table sorts the 15 companies by what they do best, based on their listings and customer reviews.

Company	Type	Best for	Area
Cummins Sales and Service	Factory shop	Cummins Onan generators, diesel pushers, coach engine work	North Loop East, Houston
Power Field Services	Generator shop	Onan power units, motorhome generator and warranty repairs	Dickinson, Bay Area
Houston RV Repair	Full-service RV shop	Generators plus AC, roofs, slides; warranty claims handled	North Freeway, north Houston
Channelview Supply	RV parts store and service	Generator repairs with parts on the shelf	Channelview, east Houston
Houston RV Service & Maintenance	RV service shop	Generator issues, oil changes, quick turnaround	Spring
C & D RV Service Center	RV shop	Generators on gas coaches and mobile business vans	Pasadena
Space City RV Repair	Mobile	Generator diagnostics and repair on site	Pearland, south Houston
Katy RV Repair	Shop + mobile	Same-day visits, shop backup for bigger jobs	Katy, west Houston
Mobile RV Tex of Houston	Mobile	Warranty claims, on-site diagnosis and parts ordering	Katy to Lake Conroe
Armadillo Mobile RV	Mobile	Repairs and dealer-recommended warranty inspections, 7 days	Katy, west Houston
B&B RV Pros	Mobile	Generator troubleshooting started from photos	Sugar Land, southwest Houston
Houston Mobile RV	Mobile	Pre-trip, front-to-back maintenance checks	League City, Bay Area
Native Embrace RV Mobile Repair	Mobile, 24 hours	Electrical and power problems	Spring, The Woodlands
Angel’s Mobile RV Repair	Mobile	Fast response, AC and plumbing alongside power issues	North Houston
TX RV Repair Shop	RV shop	General RV systems before trips or storage	Spring

Shop or mobile tech?

A mobile technician is usually the faster, cheaper first call for a generator that won’t start, surges or shuts down after a few minutes. Those problems are fuel and ignition issues in most cases, and a tech can test them in your driveway. A shop is the better choice when the generator needs to come out of the compartment, when it’s a diesel unit, when a factory warranty claim is involved, or when the repair needs a load bank test to prove the fix. Many Houston owners start mobile and only tow if the tech says the unit has to be pulled.

Common RV Generator Problems We See in Houston

Talk to enough Houston RV techs and the same handful of failures come up again and again. Heat, humidity and long storage periods drive almost all of them.

1. Cranks but won’t start, or starts and dies

This is the big one. Gasoline with ethanol starts to break down within a few months, leaving varnish in the tiny jets of the carburetor. Houston heat speeds that up. Typical fixes are a carburetor clean or replacement, a new fuel filter and, sometimes, a fuel pump. On Onan units the controller will often blink a fault code. Code 36, for example, means the engine stopped without being told to, which very often traces back to fuel starvation.

2. Generator runs but won’t start off the RV tank when fuel is low

Not every no-start is a failure. The generator’s fuel pickup in most motorhome tanks sits higher than the engine’s pickup, so the generator stops drawing fuel at about a quarter tank. That’s by design, so you can’t run the tank dry while camping. Fill up before calling for service.

3. Surging, hunting or low voltage

If the lights pulse or the air conditioner struggles, the engine may be running rough from a partly blocked carburetor, or the generator end may have worn brushes or a failing voltage regulator. A tech checks output voltage and frequency under load to tell which.

4. Shuts down when the AC kicks on

Running two roof AC units in August is the hardest work an RV generator ever does. Overloads, dirty air filters, low oil and overheating from blocked cooling airflow all show up here. A soft start on the AC compressor can help a marginal generator carry the load.

5. Battery and starting problems

Many RV generators crank from the house battery bank. Weak batteries, corroded cables or a bad start relay look like a generator fault but cost much less to fix.

6. Exhaust, rodent and storage damage

Coaches stored outdoors around Houston attract mud daubers and rodents. Nests in the air intake or chewed wiring in the generator compartment are common findings after storage.

How Much Does RV Generator Repair Cost in Houston?

Prices vary with the brand, whether it’s gas, diesel or LP, and whether the tech comes to you. These are typical ranges based on published national averages and what Houston RV owners report. Use them to sanity-check quotes, not as a price list.

Repair	Typical cost	Notes
Mobile service call / diagnosis	$100–$200	Often credited toward the repair
Oil, filter and spark plug service	$120–$250	More for diesel units
Carburetor cleaning	$250–$450	Labor-heavy on tight compartments
Carburetor replacement	$350–$650	Often the better value on badly varnished units
Fuel pump or fuel filter replacement	$150–$400	Includes parts
Brushes, voltage regulator or control board	$250–$900	Depends heavily on model
Generator removal for shop repair	$300–$800+	Varies by coach design
New Onan QG 4000–7000 class generator, installed	$4,000–$9,000+	Diesel units cost more

Repair or replace?

Repair almost always wins on a generator with modest hours that simply sat too long. Replacement starts to make sense when an older unit needs a major engine repair, when the generator end has failed, or when the total repair estimate reaches about half the price of a new unit. Ask the shop for the hour meter reading and a written breakdown before you decide.

Onan, Cummins, Generac and Diesel RV Generators

Most motorhomes in Houston carry a Cummins Onan generator, from the small Microlite and QG 2800 units on Class C rigs to QG 5500 and 7000 units on Class A gas coaches and Quiet Diesel units on pushers. Generac and Champion units show up too, especially on toy haulers and fifth wheels with built-in generators.

• Onan gas units: any competent RV tech can handle fuel, carburetor and ignition work. Cummins Sales and Service and Power Field Services are good choices for deeper repairs and warranty questions.
• Diesel generators: diesel units need injector, glow plug and fuel system knowledge. Cummins Sales and Service handles Cummins diesel engines and generators and lists motorhome service among its work.
• Propane (LP) generators: common on fifth wheels and toy haulers. Regulator and fuel lockoff problems are typical, and they need a tech comfortable with LP systems.
• Portable generators carried in the bed or on a rack: these are better handled by a small engine shop. See our portable generator repair Houston guide.

Warranty and Insurance Tips

Before paying out of pocket, check three things:

1. The generator’s own warranty. Generator warranties are separate from the RV’s warranty and often run longer. Have the model and serial number from the generator nameplate ready.
2. An extended service contract. Many RV extended warranties cover generators, but they usually require pre-authorization before the work starts. Houston RV Repair and Mobile RV Tex of Houston both mention handling warranty claims for customers.
3. Maintenance records. A claim can be denied if the generator was never exercised or serviced. Keep receipts and an hour log.

How to Keep Your RV Generator Running in the Houston Climate

Almost every tech we’ve read about gives the same advice, and it is mostly free:

1. Exercise it monthly. Cummins Onan recommends running the generator at least 2 hours a month with a load of at least half its rated output. Turn on the roof AC, not just a few lights.
2. Treat the fuel. Add fuel stabilizer before storage, and if you can find it, use ethanol-free gas in a coach that sits.
3. Change oil by hours, not years. Follow the manual’s interval (commonly every 150 hours or once a season for gas Onan units) and use the grade it specifies for hot weather.
4. Keep the compartment clean. Clear leaves, wasp nests and mud from the intake and cooling path before summer trips.
5. Check batteries before hurricane season. If you plan to use the coach as backup shelter during an outage, test the generator under full load in May.

How to Get Free RV Generator Repair Quotes in Houston

1. Write down the generator brand, model and hours from the nameplate and hour meter.
2. Note exactly what happens: no crank, cranks but no start, starts then stops, surging, or no power to the coach. Include any blinking fault code.
3. Take a short video of the start attempt and photos of the compartment. B&B RV Pros, for one, is known for starting diagnosis from photos.
4. Send one request through Repairior’s free quote form to reach several Houston RV generator techs at once.
5. Compare the trip charge, diagnostic fee, parts and labor, and ask whether the diagnosis fee is credited toward the repair.

RV Generator Repair Houston: Frequently Asked Questions

Who repairs RV generators in Houston?

Houston has factory service (Cummins Sales and Service), generator-focused shops (Power Field Services), full-service RV centers (Houston RV Repair, Channelview Supply, Houston RV Service & Maintenance, C & D RV Service Center) and many mobile RV techs who come to you, including Space City RV, Mobile RV Tex of Houston, Armadillo Mobile RV and B&B RV Pros.

How much does it cost to fix an RV generator?

Simple repairs such as a fuel filter, spark plug or carburetor cleaning usually cost about $150–$450. Carburetor replacement often runs $350–$650, and electrical repairs on the generator end can reach $900 or more. A new installed Onan unit typically costs $4,000–$9,000+.

Is there mobile RV generator repair near me in Houston?

Yes. Mobile technicians cover most of the metro: Space City RV (Pearland), Mobile RV Tex and Armadillo (Katy), B&B RV Pros (Sugar Land), Houston Mobile RV (League City), Native Embrace (Spring) and Angel’s Mobile RV (north Houston).

Why won’t my Onan RV generator start?

The most common causes are stale fuel varnishing the carburetor, a fuel level below the generator’s pickup (about a quarter tank), a weak battery, low oil shutdown and a clogged fuel filter. A blinking fault code on the start switch points the tech in the right direction.

How often should an RV generator be serviced?

Run it under load about 2 hours every month and service it according to the manual, typically an oil change around every 150 hours or yearly for gas units, plus air filter and spark plug checks.

Can a Cummins dealer work on my Onan RV generator?

Yes. Onan is a Cummins brand, and Cummins Sales and Service in Houston lists Cummins Onan generator work and motorhome service.

Should I repair or replace an old RV generator?

Repair if the engine is healthy and the problem is fuel, ignition or a control part. Consider replacement when a high-hour unit needs a major engine or generator-end repair costing about half the price of a new one.

Related Houston Generator Guides

• Generator Repair Houston: all generator types and costs
• Portable Generator Repair Houston
• Generator Maintenance Houston
• Emergency Generator Repair Houston
• Mobile generator repair in Houston

Conclusion

Most RV generator trouble in Houston comes down to fuel that sat too long and a generator that didn’t get exercised. The fixes are usually affordable when you catch them early.

• Call a mobile RV tech first for no-start, surging and shutdown problems.
• Use a shop or factory service for diesel units, warranty claims and anything that needs the generator pulled.
• Check warranty and extended service contract coverage before you approve work.
• Run the generator under load every month and treat fuel before storage.
• Compare at least two written estimates through the free quote form.

About This Guide

Editorial policy

This guide was researched and written by the Repairior Editorial Team. Every company listed comes from our Houston directory, and descriptions are limited to facts from each business’s own listing, website and public customer reviews. Businesses cannot pay to be included or ranked in this article.

Content transparency

Cost ranges are typical estimates, not quotes. Prices, warranty terms and services change, so confirm details directly with the company before booking. Repairior earns revenue from optional business plans, which have no effect on which companies appear here.

About the author

Quesnel S is part of the Repairior Editorial Team, which covers local repair services across Houston and other US cities. We review business websites, service areas and customer feedback, and talk through common failures with the trades, to help owners find dependable technicians and compare free quotes.

Helpful official resources: Cummins Onan RV generators, Cummins sales and service locator and the RV Industry Association.