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Johnny's AutomotiveJohnny's Automotive
Haines City, FL

Computer Diagnostics at our Haines City shop

Bring it to our Haines City shop and we'll handle the computer diagnostics. Here's where to find us, when we're open, and how to book a time.

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Haines City, FL31600 U.S. 27Book a time online
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Where to find our Haines City shop

Address, hours, and directions for the shop that handles your computer diagnostics.

Address

31600 U.S. 27
Haines City, FL 33844

Shop phone

(863) 422-2995

Hours

Mon to Fri, 7:30 AM to 5:30 PM

Monday
7:30 AM to 5:30 PM
Tuesday
7:30 AM to 5:30 PM
Wednesday
7:30 AM to 5:30 PM
Thursday
7:30 AM to 5:30 PM
Friday
7:30 AM to 5:30 PM
Saturday
Closed
Sunday
Closed

Recent Computer Diagnostics Work in Haines City

Real jobs completed by our team in the Haines City area

Our team

Our Team

September 2026

Service 4WD Message and Check Engine Light Both On

What the customer reported

The vehicle owner reported that the check engine or service engine light was on and that Svc 4WD was on.

What we found and did

The technician at our Haines City shop started with a diagnosis of the engine concern, including testing and inspection of the vehicle system involved. The repair then included a dtcm module from dealer stock. The technician also ran the module programming and re-learn so the new part was set up for the vehicle.

Recent Computer Diagnostics jobs at our Haines City shop

  • 2016 Ford F-150, Check Engine LightOctober 2026
  • 2015 Chevrolet Silverado 1500, No Start DiagnosisOctober 2026
  • 2016 Hyundai Genesis, Check Engine LightOctober 2026
  • 2015 Jeep Patriot, Vibration DiagnosisOctober 2026
  • 2007 Cadillac Escalade, Check Engine LightOctober 2026
  • 2002 Ford Windstar, Vehicle InspectionOctober 2026
  • 2019 GMC Sierra 1500, No Start DiagnosisSeptember 2026
  • 2024 Chevrolet Traverse, Overheating DiagnosisSeptember 2026
  • 2018 Kia Sorento, Fluid Leak DiagnosisSeptember 2026
  • 2018 Chevrolet Equinox, Check Engine LightSeptember 2026
FAQ

Computer Diagnostics in Haines City: questions answered

Answered by our licensed technicians serving Haines City.

Why do you charge for diagnosis when the parts store reads codes for free?

Because they're two different things. Reading a code takes a few seconds and tells you which system reported a fault. Finding the cause takes a technician, a lift, live data, and testing to prove which part in that system actually failed. That's the work you're paying for, and it's the part that keeps you from buying components that don't fix the car. Bring us the code you already have. It gives us a head start.

Does the diagnostic fee go toward the repair if I have you do the work?

That depends on the job, and the service advisor will lay it out at the counter before anything starts, so there are no surprises on the invoice. The bigger point is what the fee gets you either way: a confirmed cause with photos, and a quote based on the actual problem instead of a guess. Ask us when you drop the car off and we'll tell you exactly how it works for your repair.

How long does diagnosis take?

It depends on the symptom. Something that's failing right now in front of the technician can be pinned down quickly. An intermittent problem, a wiring fault, or a noise that only shows up cold takes longer, because we have to recreate the condition before we can test anything. We'll give you a time estimate up front and call you if what we find changes it. We'd rather tell you it's going to take a while than hand you a fast answer that's wrong.

What if you can't find the problem?

We'll tell you that plainly instead of picking a part and hoping. Usually it means the fault is intermittent and hasn't shown itself yet, and the next step is either leaving the car with us longer or bringing it back when the symptom is happening. You'll get everything we ruled out and how we ruled it out, which is real information even when it isn't the answer you wanted. If a job is beyond what we can test here, we'll say so rather than run up your bill.

Can you diagnose something another shop already worked on?

Yes, and we get that call a lot. We start from the car in front of us rather than from what's already been replaced, because assuming an earlier repair was right is how the same wrong answer gets repeated. Bring your paperwork if you have it. Knowing what's already been done and what changed afterward is genuinely useful. You'll get the same thing anyone else gets: a named cause, photos, and a quote, and no pressure about where you have the work done.

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ASE Certified Technicians

ASE certified techs working on your vehicle

Flexible Drop-Off Hours

Convenient service options

20+ Years

2 decades of trusted service