Diesel Zone Diagnostics

Diesel Zone Diagnostics We now offer complete auto repair for all makes and models.

Locally owned and operated Diesel Zone Diagnostics was founded on the basis of providing cost-effective, top quality mobile truck repair in Rowland Heights and the neighboring communities. We’ve since expanded to be able to provide professional auto repair and maintenance in our full service car shop for all makes and models of light, medium and heavy duty vehicles. Yet, we remain committed to off

ering expert roadside and on-site maintenance for trucks and heavy equipment. We believe in the power of exceptional customer service and aim to combine honesty and quality work ethic with modern diagnostic and repair techniques to keep our customers happy and their vehicles healthy. Whether you need routine auto maintenance for your daily driver or require complicated fleet vehicle services or semi truck repair and diesel engine diagnostics, our certified technicians are here to help. Give our Rowland Heights auto shop a call or stop by to learn more about our dedication to quality or to schedule an appointment. As a local car repair center, the team at Diesel Zone Diagnostics takes pride in helping our friends and neighbors in Rowland Heights, Diamond Bar, Hacienda Heights and the surrounding California communities with their automotive service needs. We’ve invested in the latest computer aided diagnostic tools to ensure we’re able to provide fast and effective repair and maintenance for all makes and models of import and domestic cars, trucks, vans, SUVs, big rigs and heavy equipment. With mobile repair trucks outfitted with all the tools necessary to keep your rigs running right, you can count on us for quality care in our facility or at your location with on-site heavy equipment repair in Los Angeles County. Give Diesel Zone Diagnostics a call at (323) 990-8059 to learn more about our services or to request an estimate for the cost of auto repair in Rowland Heights.

Road Call β€” Trailer Losing Air Pressure 🚨Driver called with an air leak on the trailer.Found multiple bad brake air cham...
03/15/2026

Road Call β€” Trailer Losing Air Pressure 🚨

Driver called with an air leak on the trailer.
Found multiple bad brake air chambers leaking air, which can cause brake issues and put the trailer out of service fast.

Replaced the faulty chambers on site, checked the air system, and got the unit back on the road safely.

Air leaks may seem small, but they can lead to:
βœ” DOT violations
βœ” Brake problems
βœ” Downtime on the road
βœ” Failed inspections

We handle roadside repairs, trailer service, and BIT / DOT inspections.

Diesel Zone Diagnostics
Mobile Fleet Maintenance
Serving Southern California


truckrepair heavyduty dotinspection
bitinspection logistics truckinglife preventivemaintenance

🚨 Re**er Trailer Fuel Tank Leak – Replaced Before It Became a Bigger ProblemA fleet reached out after discovering a leak...
03/05/2026

🚨 Re**er Trailer Fuel Tank Leak – Replaced Before It Became a Bigger Problem

A fleet reached out after discovering a leaking fuel tank on their re**er trailer. Issues like this can quickly lead to fuel loss, environmental concerns, and unnecessary downtime.

πŸ”§ Diagnosis: Fuel tank leak
πŸ›  Repair: Removed the damaged tank and installed a new re**er fuel tank assembly
βœ… Result: Trailer back in service and ready to keep loads cold and moving

At Diesel Zone Diagnostics, we help fleets stay operational with fast, on-site mobile repairs and inspections.

πŸ“ Serving the Greater Los Angeles Area
βœ” Trailer Repairs
βœ” Re**er Fuel System Repairs
βœ” BIT Inspections
βœ” Federal Annual Inspections
βœ” Mobile Fleet Maintenance

If your fleet needs reliable service without the hassle of sending equipment to the shop, we bring the repair to you.

**erTrailer FleetService RefrigeratedTransport DieselMechanic TruckFleet DOTCompliance LogisticsFleet TransportationIndustry

🚨 ABS light on a trailer? That’s not something a fleet can ignore.A customer called us out after their trailer ABS syste...
03/04/2026

🚨 ABS light on a trailer? That’s not something a fleet can ignore.

A customer called us out after their trailer ABS system stopped functioning. After a full diagnostic, we traced the issue to a faulty ABS valve assembly.

βœ” Diagnosed the issue
βœ” Replaced the ABS valve
βœ” Restored proper braking system function

Now the trailer is back on the road safely and DOT compliant.

Small issues like this can turn into downtime, violations, or safety risks if they’re ignored.

That’s why Diesel Zone Diagnostics provides on-site trailer diagnostics and repairs, helping fleets stay operational without the hassle of sending equipment to a shop.

πŸ“ Serving the Greater Los Angeles Area
πŸš› Mobile Trailer Repair & Fleet Maintenance




DieselMechanic
MobileFleetService
DOTCompliance
TruckMaintenance
TrailerMaintenance
LogisticsIndustry
TransportationIndustry
DieselTechnician
CommercialTrucking
DieselZoneDiagnostics

Before ➑️ AfterHub and brake repair completed on-site today.Removed damaged components, replaced bearings and hardware, ...
03/03/2026

Before ➑️ After

Hub and brake repair completed on-site today.
Removed damaged components, replaced bearings and hardware, and reassembled with new brake shoes and hub assembly.

Back on the road safely. βœ”οΈ

At Diesel Zone Diagnostics, we bring the shop to your fleet to minimize downtime and keep your equipment moving.

πŸ“ Serving the Greater Los Angeles Area
πŸ”§ Mobile Fleet Maintenance

FleetManager OnSiteRepair HeavyDuty DOTCompliance

03/29/2024
03/28/2024
Women πŸ’ͺ🏿
03/08/2024

Women πŸ’ͺ🏿

Gearing up ⬆️ πŸ†
03/06/2024

Gearing up ⬆️ πŸ†

Another πŸ‘†πŸ½πŸ†
03/04/2024

Another πŸ‘†πŸ½πŸ†

02/28/2024

We use only the best πŸ†

Address

18201 Colima Road
Rowland Heights, CA
91748

Opening Hours

Monday 7am - 5pm
Tuesday 7am - 5pm
Wednesday 7am - 5pm
Thursday 7am - 5pm
Friday 7am - 5pm
Saturday 8am - 1pm

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