Diesel Only — MS · TN · AR

RV & Motorhome Emergency Service

Diesel Doc provides 24/7 mobile emergency service and on-site mechanical repairs exclusively for Class A diesel-pusher and Super C motorhomes across North Mississippi, Greater Memphis, and Eastern Arkansas. Our mobile technicians travel directly to your campsite, state park, RV resort, storage facility, or highway breakdown location in fully equipped service trucks. We diagnose and repair diesel engines, Spartan and Freightliner chassis, Cummins Onan generators, cooling packages, air suspensions, and hydraulic leveling slide-outs on-site without expensive heavy-wrecker towing, so the trip doesn’t end at a repair shop.

CALL NOW FOR EMERGENCY ASSISTANCE  (901) 258-1528

Other Services

From Quick Fixes To Full Repairs

What Does Diesel Doc’s RV & Motorhome Emergency Service Cover?

Diesel Doc provides complete on-site diagnosis and mechanical repair for the heavy-duty diesel propulsion, chassis, pneumatic, hydraulic, and auxiliary power systems of motorized RVs. We do not service internal living-quarter residential appliances (such as stoves or refrigerators); our focus is entirely on the mechanical, electrical, and powertrain systems that drive and level the coach.

Diesel Powertrain Diagnostics & Performance

On-site troubleshooting of check engine lights, loss of power, fuel starvation, and emission derate codes on Cummins and Caterpillar pusher engines.

Onan Diesel Generator Repair

Diagnostics and servicing for Cummins Onan QuietDiesel and Power Tech generator sets, resolving no-start faults, fuel delivery problems, glow plug issues, and flashing fault codes.

Hydraulic Leveling Jacks & Room Slide-Outs

Emergency repair of stuck slide-out rooms and failed automatic hydraulic leveling jacks (HWH, Lippert/LCI, Equalizer Systems) that prevent the coach from traveling.

Chassis Air Suspension & Compressed Air Systems

Repair of air ride dump valves, ride height control valves, punctured air bags, air governor lines, and compressed air leaks affecting coach braking and stability.

Rear-Engine Cooling Systems & Overheating

Remediation of split radiator hoses, serpentine and water pump belt failures, failed hydraulic fan motors, and coolant leaks common on long mountain or highway grades.

High-Amp 12V Electrical & House Battery Charging

Troubleshooting heavy-duty engine alternators, dual-battery isolator solenoids, starter motors, and commercial chassis battery banks.

Emergency Roadside Services

Fuel delivery for empty or air-locked fuel systems, heavy-duty 12V jump-starts, and lockouts.

Systems

What Diesel Motorhome Systems Does Diesel Doc Repair On-Site?

Class A Diesel Pusher Engine & ECM Diagnostics

Diesel Doc performs point-of-failure engine diagnostics utilizing OEM electronic scanners for Cummins (ISB, ISC, ISL, L9, X12) and Caterpillar (C7, C9, 3126) motorhome platforms. Technicians connect directly via the round 9-pin J1939 diagnostic port to interrogate fault codes, address high-temperature shutdown warnings, execute DEF/aftertreatment troubleshooting, and clear active derates.

Cummins Onan & Auxiliary Diesel Generators

Generator repairs restore onboard auxiliary power to ensure air conditioning and electrical systems run when disconnected from shore power. We service Cummins Onan QuietDiesel (QD 6000, 8000, 10000, 12500) and commercial generator units. On-site service handles fuel pump replacements, clogged fuel filter swaps, fuel line bleeding, control board code retrieval, and glow plug replacement.

Hydraulic Leveling Jacks & Slide-Out Systems

Hydraulic services resolve stuck slide rooms and retracted/extended jack failures that leave coaches stranded at campgrounds. Technicians troubleshoot Lippert (LCI), HWH, and Power Gear hydraulic pumps, directional control valves, fluid reservoir leaks, blown high-pressure hoses, and electronic control switch failures to restore operation.

Motorhome Chassis, Air Springs & Foundation Brakes

Chassis repairs address air suspension sag, ride height instability, and pneumatic brake issues on custom motorhome platforms. We service Freightliner Custom Chassis (XC-Series), Spartan (Mountain Master, K2, K3), and Roadmaster chassis, replacing ruptured air springs, leveling valves, air dryer cartridges, and foundation air brake valves.

Motorhome Chassis, Air Springs & Foundation Brakes

Chassis repairs address air suspension sag, ride height instability, and pneumatic brake issues on custom motorhome platforms. We service Freightliner Custom Chassis (XC-Series), Spartan (Mountain Master, K2, K3), and Roadmaster chassis, replacing ruptured air springs, leveling valves, air dryer cartridges, and foundation air brake valves.

Rear-Mounted Cooling Packages & Overheating

Cooling repairs resolve overheating caused by clogged rear radiators, failed hydraulic fan drives, or burst coolant hoses. Because diesel pushers pull road grime through side- and rear-mounted radiator packs, we clear obstructions, replace thermostats, replace belt tensioners, and bleed air-locked cooling systems on-site.

Cummins Onan & Auxiliary Diesel Generators

Generator repairs restore onboard auxiliary power to ensure air conditioning and electrical systems run when disconnected from shore power. We service Cummins Onan QuietDiesel (QD 6000, 8000, 10000, 12500) and commercial generator units. On-site service handles fuel pump replacements, clogged fuel filter swaps, fuel line bleeding, control board code retrieval, and glow plug replacement.

12V Starting, Alternators & Battery Banks

Electrical repairs resolve engine no-starts, parasitic battery draws, and auxiliary charging failures. We diagnose and install high-output Leece-Neville and Delco Remy alternators, replace heavy-duty starters, test chassis-to-house battery isolation relays, and replace deep-cycle Group 31 AGM chassis batteries.

What Types of RVs and Motorhomes Does Diesel Doc Service?

Diesel Doc services diesel-powered motorhomes, specializing in Class A rear-engine diesel pushers and Class Super C commercial chassis platforms.

Types of RVs and Motorhomes Diesel Doc Services

(Please note: Diesel Doc does not service gasoline-powered motorhomes, Ford Triton V10/V8 chassis, tow-behind travel trailers, or fifth wheels.)

Emergency Scenarios

What Situations Qualify as an RV Breakdown Emergency?

An RV emergency is any mechanical, electrical, or pneumatic failure that prevents a motorhome from driving safely or departing a campground, rest area, storage facility, or roadway shoulder. Diesel Doc dispatches emergency response units for:

Engine No-Start or Shutdown in Transit

Dead starter, dead battery banks, fuel delivery loss, or shutdown codes on interstates or ramps.

Leveling Jacks Stuck in the Extended Position

Hydraulic jacks that will not retract, preventing the coach from moving without damaging landing legs.

Slide-Out Rooms Jammed Open

Slide rooms that will not retract flush into the coach sidewall, making highway transit illegal and unsafe.

Pusher Engine Overheating

Sudden coolant loss, blown radiator hoses, or fan motor failure on interstate grades.

Air Suspension Collapse

Air bags failing to inflate, leaving the coach resting on its bump stops with compromised steering and clearance.

Auxiliary Generator Failure in Extreme Heat

Onan generator stalling while boondocking or traveling, knocking out living-area climate control.

Fuel Depletion or Air-Locked Fuel Lines

Motorhomes that have run out of diesel fuel and require pressurized line bleeding.

Scheduled Campground Maintenance vs. Roadside Emergency Dispatch

Diesel Doc supports traveling RV owners and seasonal residents with both urgent roadside dispatch and scheduled campsite repairs:

DIESEL DOC RV SERVICE FRAMEWORK

SCHEDULED RESORT & STORAGE SERVICE

  • Scheduled at campgrounds, RV resorts, and private storage lots
  • Generator oil, fuel & air filter PM
  • Pre-departure chassis inspections
  • Hydraulic slide & jack servicing
  • Book via dispatch phone line

24/7 ROADSIDE EMERGENCY DISPATCH

  • Immediate priority dispatch to interstates, shoulders, and ramps
  • Rapid point-of-failure mechanical repairs to avoid heavy wrecker towing
  • Real-time ETA tracking provided
  • Call (901) 258-1528 for Roadside Hub

When stranded on the interstate or shoulder: Contact our 24/7 Emergency Roadside Assistance Service for priority service.

When experiencing issues with commercial haulers: Access dedicated fleet repair through our Mobile Semi-Truck & Trailer Repair Division.

Diesel Doc

Why Choose Diesel Doc Over an RV Dealership or Heavy Tow?

Diesel Doc brings commercial-grade heavy-duty diesel capabilities directly to your motorhome, eliminating the high costs and weeks-long delays typical of retail RV dealerships.

Chart of Diesel Doc mobile rv and motorhome repair versus a dealership or towing

WHERE WE WORK

Where Does Diesel Doc Provide Mobile RV & Motorhome Repair?

Diesel Doc provides mobile service across private RV parks, state campgrounds, storage facilities, and transit corridors in North Mississippi, Greater Memphis, and Eastern Arkansas

Mississippi

North Mississippi

I-55 & I-22 / US-78

Cities

Southaven, Horn Lake, Walls, Hernando, Olive Branch, Coldwater, Senatobia, Holly Springs, Potts Camp, Oxford, New Albany, Batesville

Counties

DeSoto, Marshall, Tate, Tunica, Panola, Lafayette, Union

Tennessee

Greater Memphis

I-40, I-55 & I-240 Loop
I-269 Outer Beltway

Cities

Memphis, Bartlett, Germantown, Collierville, Arlington, Oakland

Counties

Shelby, Tipton, Fayette

Arkansas

West Memphis / Eastern Arkansas

I-40, I-55 & I-555

Cities

West Memphis, Marion, Jonesboro

Counties

Crittenden, Craighead

North Mississippi Corridor

Serving campgrounds, state parks (including Wall Doxey and Sardis Lake areas), storage yards, and transit stops along Interstate 55 and Interstate 22/US-78. Coverage spans Southaven, Horn Lake, Walls, Hernando, Olive Branch, Coldwater, Senatobia, Holly Springs, Potts Camp, Oxford, New Albany, and Batesville across DeSoto, Marshall, Tate, Tunica, Panola, Lafayette, and Union counties.

Greater Memphis Metropolitan Corridor

Direct dispatch to RV parks, resort communities, and highway lanes across Interstate 40, Interstate 55, Interstate 240, and Interstate 269. We service Memphis, Bartlett, Germantown, Collierville, Arlington, and Oakland within Shelby, Tipton, and Fayette counties.

Eastern Arkansas & West Memphis

Mobile RV repair along the Mississippi River bridge approaches on Interstate 40, Interstate 55, and the Interstate 555 spur. Serving West Memphis, Marion, and Jonesboro across Crittenden and Craighead counties.

Our Certifications

  • DOT Certified

  • ASE Medium-Heavy Truck Certifications (Series T)

  • OEM Certification

  • EPA Certification

Questions

Frequently Asked Questions

Diesel Doc repairs diesel engines, Freightliner/Spartan chassis components, air ride suspensions, Cummins Onan diesel generators, hydraulic leveling jacks, slide-out mechanisms, high-output 12V electrical systems, and cooling packages on location.

No. Diesel Doc specializes exclusively in diesel-powered motorhomes, Class A diesel pushers, and Super C commercial chassis platforms. We do not service gas engines (such as Ford Triton V10/V8).

Yes. Our mobile service trucks travel directly to your campsite, state park, RV resort, or storage facility across MS, TN, and AR, performing repairs without moving the coach.

Do not attempt to drive with extended jacks. Call Diesel Doc at (901) 258-1528. Our technicians troubleshoot hydraulic solenoids, release manual bypass valves, repair broken hydraulic lines, and safely retract the leveling system on-site.

Yes. We diagnose hydraulic and mechanical slide mechanisms, repair relief valves and drive motors, and manually override or reset the system so the slide-out seals securely for travel.

The most common causes are fuel starvation (often caused by an RV fuel tank dropping below 1/4 full, which cuts the generator fuel straw), clogged fuel filters, a failed electric lift pump, or air lock in the fuel lines. We carry replacement parts and priming tools to resolve these issues on-site.

Because diesel pushers have rear- or side-mounted radiators close to the pavement, they accumulate oily mist and highway dirt that clogs cooling fins. Overheating is also caused by slipping hydraulic fan drive belts or broken thermostat assemblies, all of which we repair on location.

Yes. Our mobile units carry OEM diagnostic software to scan Cummins and Caterpillar engines, retrieve diagnostic fault codes, diagnose DEF/SCR emissions faults, and clear derates on-site.

We deliver clean ultra-low sulfur diesel directly to your location, fill your supply tank, replace fuel filters if clogged, and manually bleed the fuel rail to start the engine without fuel injection pump damage.

No. Diesel Doc is a mechanical, electrical, chassis, and generator repair service[cite: 6]. We do not service interior residential camper appliances (such as Norcold/Dometic absorption refrigerators, propane stoves, or domestic plumbing).

Cost is determined by the specific repair required, parts, and travel distance[cite: 6]. Diesel Doc provides a clear, upfront estimate covering labor and parts before any mechanical work begins.

Response times depend on your distance from our nearest active mobile technician[cite: 6]. Highway breakdown emergencies are prioritized in our dispatch queue, and a real-time ETA is provided when you call.

Your RV or Motorhome broken down?

Call now. A technician will be routed to your exact location.