Finding the true cause of a transmission problem is just as important as repairing it. Modern automatic gearboxes combine mechanical precision, advanced hydraulics and complex electronics - and without the right equipment and experience, identifying the exact fault is slow, expensive and often wrong.
With more than 30 years of hands-on industry experience, our specialists in Varna combine dedicated diagnostic systems with something no tool replaces: the specialist’s practical experience and judgment on a real road test. Every repair decision we recommend is based on clear, verified data - based on measured findings.
The same symptom can have different causes - from worn clutches and aging solenoids to a damaged torque converter or a failing control module (TCM). Replacing parts until the problem disappears is the most expensive diagnostic method ever invented. That is why:
We use dedicated diagnostic systems covering all major transmission brands and models, and we keep our equipment current.
We maintain licensed software for a range of vehicle brands. The available programming, adaptation and calibration functions are confirmed per vehicle and module.
We combine computer diagnostics with mechanical inspection - and hydraulic pressure testing where necessary - because many mechanical and hydraulic problems do not generate a specific fault code, or the stored code indicates the consequence rather than the root cause.
We diagnose before we repair - so you pay for the repair you actually need. The findings go straight into a clear plan, whether that is a fluid service, a valve body repair or a complete transmission repair.
Computer testing is essential - but real diagnostics comes from experience and the road.
Our Comprehensive Diagnostic goes far beyond connecting a tool:
When the vehicle is safe to drive, we perform a road test under suitable conditions to reproduce the symptom - the route and duration are determined by the specialist.
Our specialists check for unusual noises and vibrations, assess shift patterns, and analyse live diagnostic data in real time.
Joining the road test is possible by prior arrangement and when conditions allow - our expert explains the symptoms in plain language.
A full test can take up to an hour - because the fault that appears only warm, only uphill or only in traffic is precisely the one worth finding.
Technology plus human expertise finds the problems no diagnostic tool can reveal on its own.
Full computer diagnostics - analysis of fault codes, parameters, commanded values and the functional tests available for the specific vehicle.
Hydraulic pressure analysis for valve body and pump performance - where needed and applicable to the unit; and when the valve body itself is the suspect, our Hydra-Test valve body bench tests supported models against master data.
Mechanical inspection for wear and damage - including what the drained fluid and pan magnet reveal.
Live data monitoring under different temperature and load conditions.
Adaptation resets, coding and software operations - performed when the procedure for the specific unit requires them or when the repair does, including after a fluid service.
We operate specialized bench equipment for testing certain Mercedes-Benz 7G-Tronic (722.9) VGS / TCM modules - 2nd and 3rd generation.
The bench allows us to:
Perform bench diagnostics on the module without installing it back into the car - the scope of the test depends on the generation and module number.
Simulate defined input signals and operating modes, including RPM changes - assisting the detection of certain speed sensor, position sensor and computer faults.
Reduce diagnostic time from days of test driving to a single bench session - you can also send us the unit by courier and receive the test findings without the car ever leaving your city.
Today the Mercedes bench is part of our multi-brand diagnostic setup - browse our Mercedes-Benz transmission parts catalog for the repair side of the same story.
You know the cost before we begin.
Prices are final and include VAT.
Diagnostic tool connection, check of stored and active fault codes in the TCM, printed or emailed fault report.
Computer test scanning, live data analysis, extended road testing under multiple conditions and accessible visual inspection, with a detailed report and recommended solutions. Additional fluid draining or bench tests are priced separately when needed.
Do not risk unnecessary repairs - start with a precise, professional diagnosis.
The basic electronic diagnostic takes about 30 minutes. The comprehensive diagnostic with road testing takes up to 1-2 hours depending on the vehicle and its condition.
If a warning light just came on and the car drives normally, start with the basic scan. If the problem is behavioral - slipping, jerking, noises, symptoms that come and go - choose the comprehensive: those faults rarely store a code, and finding them is exactly what the road test is for.
Because it includes up to an hour of expert labor: an extended road test under suitable conditions, real-time data monitoring by a specialist and physical inspection - work that finds the faults no scanner shows.
Yes, by prior arrangement and when conditions allow. Our expert explains the symptoms in real time, so you leave understanding your transmission, not just holding a report.
Yes, sure: detected fault codes, live data findings when available - a document you can use anywhere, though the repair itself is naturally something we would be glad to do.
You pay only the fixed diagnostic fee. If no specific fault is identified during testing, no repair will be recommended at that stage. This does not necessarily rule out an intermittent or developing issue, so we may advise monitoring the vehicle and returning if the symptoms persist, change or become more frequent.