Serving the Phoenix metro and surrounding areas

Know Before It Fails. Fix Before It Costs.

We go beyond basic scans. Our complete engine checks give you a clear picture of performance, wear, and potential failures so you can plan smarter, prevent downtime, and extend vehicle life. Fast, expert, and built around your fleet’s bottom line.

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Know What’s Wrong. Fix It Before It Gets Worse

Not Sure What That Engine Light Really Means?

Your truck’s throwing a code. Performance is down. You’re choosing between guessing and gambling, or wasting time in the shop without answers.

Here’s what that usually leads to:

  • Wasted hours chasing the wrong fix

  • Breakdowns that could’ve been prevented

  • Mounting repair costs from avoidable damage

KTS Diesel’s Complete Engine Diagnosis cuts through the noise fast, with expert insight and real answers, so you know exactly what’s wrong and what to do next.

Our skilled diesel mechanics handle engine diagnostics, repairs, and overhauls quickly, whether on-site or in-shop. With parts readily available and streamlined processes, we reduce downtime and control costs. Our preventive maintenance keeps your fleet running smoothly. We don’t just fix trucks; we keep you moving.

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Mobile & In-Shop Engine Diagnostics You Can Trust

  • Full System Scan – $145

    Complete diagnostic across engine, transmission, aftertreatment, and maintenance systems.

  • Professional Fault Code Readout
    A certified diesel tech will explain what the codes mean and what to do next.

  • Clear, Honest Estimate
    Know exactly what repairs and costs are needed, no pressure.

  • Maintenance Alert? We’ve Got You Covered
    If it’s routine, we’ll help you plan the maintenance to stay on schedule.

Limited-Time Offer*: In-Shop Computer Service

  • In-shop computer scan: Get a free computer scan when estimated repairs are approved within 5 business days. $145 value.

    * Offer valid in-shop only for the first 30 days. Cannot be combined with another offer.

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Smarter Diagnostics. Fewer Breakdowns.

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Comprehensive System Check.

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Expert Insight, Not Just Codes.

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$45 Toward Repairs.

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complete engine diagnosis: your questions answered

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complete engine diagnosis: your questions answered *

  • We run a full system scan across engine, transmission, aftertreatment, and maintenance systems. You’ll get a detailed, expert assessment of your truck’s condition, no guesswork.

  • We offer both. Choose what works best: mobile diagnostics at your location or fast in-shop service at ours. Either way, we keep disruption to a minimum.

  • We’ll let you know right away and help you plan routine service before it turns into a bigger problem, saving time and money down the line.

  • Accurate diagnostics lead to faster repairs and better planning. We help you act early, prevent major failures, and keep trucks in rotation.

  • Absolutely. KTS Diesel specializes in fleet management for operations with 3 or more trucks. Our diagnostic services, workflows, and support systems are built to meet the demands of busy fleet managers who need fast answers, reliable service, and minimal downtime across multiple vehicles. We’re not just a repair shop, we’re your fleet partner.