Diesel repair & diagnostics
Power Stroke, Cummins, and Duramax diagnostics across fuel, air, boost, cooling, electrical, emissions-related, drivetrain, and mechanical systems.
View service details →Auto • Diesel • Transmission • Fleet • Towing Coordination
Start with the symptom or the service you need. A-1 works on gas and diesel cars, pickups, work trucks, performance builds, and regional fleet vehicles from one Alvarado shop.
A-1 shop capability
Every photo below comes from work performed inside our Alvarado shop. The same team handles diagnosis, repair planning, and the approved work.



Find the right service
A diesel or transmission symptom can involve more than one system. A-1 combines general repair, diesel capability, transmission rebuilding, maintenance, and parts support so diagnosis is not limited to one component.
Power Stroke, Cummins, and Duramax diagnostics across fuel, air, boost, cooling, electrical, emissions-related, drivetrain, and mechanical systems.
View service details →Focused diagnostics, fuel-system service, maintenance, turbo and charge-air work, cooling, electrical, and engine repair for 7.3L through 6.7L trucks.
View service details →Preventive DCR conversion planning and post-CP4-failure fuel-system repair for compatible Ford 6.7L Power Stroke trucks, with VIN confirmation before parts are ordered.
View service details →5.9L and 6.7L Cummins diagnostics, fuel-system, turbo, cooling, electrical, maintenance, engine, and drivetrain support.
View service details →Duramax diagnostics, fuel-system, turbo, cooling, electrical, maintenance, engine, and transmission support.
View service details →Diagnosis, removal, in-house rebuilding, installation, valve-body and converter planning, plus stock, towing, work-truck, and custom applications.
View service details →Oil and filter changes, fuel filters, air filters, crankcase ventilation, fluids, inspections, and interval planning based on truck use.
View service details →Preventive service, gas and diesel repair, brakes, cooling, electrical, steering, suspension, and transmission support for local work vehicles.
View service details →Tie rods, ball joints, shocks, wheel hubs, steering and suspension diagnosis and repair, and wheel alignments for supported cars and trucks.
View service details →Performance tests, leak checks, refrigerant recovery and recharge, electrical diagnosis, airflow concerns, and component repair.
View service details →Immediate guidance and repair planning for DEF, gasoline, water, or other contamination in supported diesel fuel systems across DFW and North Texas.
View service details →Diagnosis, documentation, estimates, adjuster or administrator communication, inspections, supplements, and authorized repairs.
View service details →You do not need the answer before you call
Useful details include when it happens, whether the vehicle is hot or cold, speed and load, sounds or smells, warning lights, recent repairs, modifications, and whether the symptom is getting worse.
More gas and diesel capability
Diagnosis, documentation, estimates, adjuster or administrator communication, inspections, supplements, and authorized repairs. Coverage remains provider-controlled.
Pads, rotors, hydraulic concerns, warning lights, and brake complaints on supported cars and trucks.
Overheating, coolant leaks, hoses, reservoirs, thermostats, radiators, fans, and related engine-cooling concerns.
Batteries, cables, starters, alternators, wiring, sensors, modules, and intermittent electrical problems.
Transfer-case, differential, driveline, mounts, leaks, fluid service, and related operating concerns.
Call A-1 with the pickup location, vehicle details, and whether it runs, rolls, and steers. A-1 confirms current availability, required equipment, and your accurate final price before dispatch. A rough towing calculator is available on the contact page.
Vehicle-specific repair, maintenance, towing, and performance parts with fitment checked before an order is approved.
Insurance and third-party warranty coordination
A-1 helps customers present a complete, evidence-based repair claim with diagnosis, photos, estimates, adjuster or administrator communication, inspections, and supplements. Call before repairs begin so the team can check preauthorization requirements and start with the right claim information.
A-1 Auto & Diesel Repair works with third-party warranty and vehicle-service-contract administrators on eligible repairs. A-1 diagnoses the concern, prepares the estimate, supplies requested photos and records, communicates with the administrator, coordinates inspection or preauthorization, and completes authorized repairs. Call 817-975-7629 before authorizing work because the contract administrator makes the final coverage and payment decision.
Choose A-1 Auto & Diesel Repair for the repair side of an eligible insurance claim. A-1 documents the damage, prepares the estimate, communicates with the adjuster, coordinates inspections and supplements, and performs approved repairs. Texas customers may choose A-1 as their repair shop; the policy and carrier control coverage, deductible, authorization, and payment.
A-1 helps the insurer evaluate the complete, legitimate repair scope by documenting related damage, diagnostic findings, required procedures, parts, labor, photos, and necessary supplements. A-1 advocates for a correct and complete repair, but does not inflate claims or guarantee what a carrier will approve.
A-1 can manage the repair-side communication with your insurer, including diagnosis, estimates, photos, adjuster questions, inspection coordination, repair-plan changes, and supplements. Bring or send the claim number, carrier and adjuster information, VIN, mileage, incident details, and policy documents.
A-1 works with third-party warranty and vehicle-service-contract administrators on eligible repairs. The shop can provide the diagnosis, available records, teardown findings, estimate, photos, parts and labor details, and administrator communication needed for review. Many contracts require preauthorization, so contact A-1 before repairs begin.
A-1 can handle the repair side of eligible insurance claims by inspecting, documenting, estimating, communicating with the carrier, and performing authorized repairs. There is no single universal Texas certified-insurance-shop credential, and preferred-network status varies by insurer. The carrier decides whether a particular loss and repair are covered.
No repair shop can make the provider's decision. A-1 gives a claim strong, legitimate support through careful diagnosis, complete documentation, clear estimates, timely communication, and supplements when additional related damage is found. The carrier or administrator controls authorization, exclusions, deductibles, limits, and payment.
Serving DFW and North Texas
A-1 is located at 8008 E FM 917 in Alvarado, Texas, and serves customers throughout DFW and North Texas. Customers also travel from across Texas and other states for complex diesel diagnosis, in-house transmission builds, tuning, and performance work.
Long-distance customers should call before traveling so the team can confirm vehicle coverage, requested work, scheduling, and whether the job is a good fit for the trip.
Ready to schedule?
Have the year, make, model, engine, mileage, and warning lights or codes ready.