Why Am I Paying For Diagnostics? | Tapp's Garage

There is a huge difference between our Techs giving you an estimate for visible or known repairs versus our Techs diagnosing a difficult, technical or intermittent issue. Accurate diagnosis of your vehicle’s troubles is imperative for precise estimates and to be able to provide economical, accurate and lasting repairs, but it can frequently take a lot of time and resources to get there. These resources we may need to invest are expensive, so we thought we’d explain the need for and the expense of technical diagnostic procedures.

In some cases, diagnosing a problem can be straightforward and there may be minimal
expense when coming to an answer. Other times, problems are complex, may only appear
under certain conditions, only appear intermittently, or may be caused by multiple interacting
systems. The time has passed when someone with basic knowledge and a few
tools can properly diagnose or repair your vehicle. Today’s technical problems require
the attention of highly trained and experienced Technicians, along with the use of proprietary
equipment and data resources. Difficult problems on late model computer-controlled
vehicles often require more time for diagnostic procedures than the actual repair
time needed to correct them.
If your “Check Engine” light comes on and warns of problems with the engine
management, body control, or other computer control systems, code retrieval will reveal
trouble codes (if stored), but these codes offer no specific information about causes or
corrections and may not reveal the existence of multiple problems. In some cases there
will be no codes or the symptoms may be intermittent. These “no code”, “intermittent”
complaints will challenge even the best of the best tools and technicians. Many shops do not have the information, equipment or trained personnel to perform proper diagnosis, repair or verification. They will retrieve a trouble code from the vehicle and then replace likely parts until they might stumble on a fix (all at the
client’s expense). Simply “throwing parts at cars” will never fix certain types of problems; corroded connectors, broken wires inside harnesses, high resistance pathways or poor grounds, or a series of problems, nor prevent repetitive failures if underlying causes are not determined. We will pull trouble codes for free if requested, but we can’t move from trouble code information to professional guaranteed repair without diagnosis
and repair verification.
Maintaining the ability to accurately diagnose technical problems is expensive. Aside
from the labor costs of experienced ASE Certified Technicians, diagnostic equipment
and data access are costly. There is a world of difference between a code reader and a
manufacturer-specific diagnostic scanner that can access and record multiple live data
streams. Even a good generic diagnostic scanner is expensive, but the manufacturer-specific
diagnostic tools we require are $3000 to $9000 each and require thousands of dollars
in yearly updates. Like many shops, we could choose not to do technical work. We
could just do the profitable easy stuff but that is neither our mission statement nor
why people use our service. We won’t just take profit from basic repairs and maintenance
services, and then when presented a real problem say “Oh sorry we can’t do that”
and send clients to seek help elsewhere, or worse yet pretend to be qualified, stumble
around and guess what might be wrong and replace parts in hopes of figuring out what
is wrong at our client’s expense.
No one likes to pay diagnostic charges. We understand it is frustrating to hear that we
need to charge for time to determine the cause and correction for your vehicle’s problem
to even give an accurate estimate for repair. We spend roughly 30% of our total available
time on some form of diagnostic evaluation, and the expense of proprietary equipment
and experienced personnel represents major overhead. Not billing for diagnostic
time would quickly force us to change our professional methods. We prefer to stay
equipped, well staffed, capable and honest and to bill our time out fairly and accurately.

This article should give some feel for why diagnostic time is both necessary and a value
to our clients. If you ever have any questions about diagnostic charges or any other
subject, please feel free to speak with one of our Service Advisors who would be happy to help.


Dwyer, Tom (2011). Why do we charge for diagnostic time? Retrieved on November 30, 2012 from http://tomdwyer.com/2011/uncategorized/shop-talk-why-do-we-charge-for-diagnostic-time/

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