San Marcos,
where we dispatch.
Spot-On Automotive Diagnostics dispatches mobile module programming, ADAS calibration, key & immobilizer services, electrical diagnostics, and diesel work to repair shops, body shops, transmission shops, and dealerships in San Marcos, Texas. San Marcos is beyond our 20-mile included travel radius; a $2.50/mi round-trip charge applies. Remote J2534 programming and mail-in bench service may be more economical at this distance.
On-site programming at your bay.
San Marcos is approximately 55 miles north of our San Antonio shop along I-35. We do dispatch to San Marcos for partner shops, but at this distance the trip charge becomes significant — remote J2534 or mail-in bench is often the more economical choice for single-job work.
Lower cost, faster turnaround for most jobs.
Remote J2534 programming through your shop's pass-thru device or compatible Autel MaxiSys avoids the trip charge entirely. We connect from our shop and run the full OEM toolchain through your equipment. Mail-in bench service handles boot-mode reads, BMW DME ISN retrieval, Mercedes 722.9 TCM cloning, FRM data recovery, and other procedures that can't go through the OBD port. Ship the module, we work it, ship it back.
The jobs that justify the trip.
Multi-module work that would take a half-day or more of remote-session time, ADAS calibration requiring on-site target setup, and high-stakes work where being physically present in the bay matters. Call (210) 439-7905 — we'll tell you straight up whether dispatch or remote makes more sense for your specific job.
Vehicle owners in San Marcos
Vehicle owners in San Marcos are welcome too — in-shop, by appointment, at 4715 N Stahl Park, Suite 105, San Antonio, TX 78217. We do not dispatch mobile service to vehicle owners. From San Marcos the shop is a run south on I-35; book first so the right OEM tooling is set up when you arrive.
Do you do module programming in San Marcos?
Yes. Module programming is the primary service we deliver to San Marcos shops, whether by dispatch or by remote session: ECM, PCM, TCM, BCM, ABS, SRS/airbag, instrument cluster, and body-controller programming, plus variant coding, cloning, virginizing, and software corrections. The OEM application is used every time — ISTA, XENTRY, ODIS, PIWIS, Pathfinder, FDRS, GDS2, wiTECH, GTS+, HDS — and security-gated steps run under our NASTF VSP registration.
Is San Marcos inside the 20-mile travel radius?
No. San Marcos is beyond our 20-mile included travel radius; a $2.50/mi round-trip charge applies. At this distance most shops choose remote J2534 programming or mail-in bench service; mobile dispatch is available and quoted per mile. The trip charge is stated as its own line before we roll, and San Marcos shops that stack several vehicles onto one visit divide that single charge across them.
Can a vehicle owner in San Marcos book?
Yes — in-shop, by appointment, at 4715 N Stahl Park, Suite 105, San Antonio, TX 78217. San Marcos owners drive in for diagnostics, module programming, key and immobilizer service, and ADAS calibration. We do not dispatch mobile service to vehicle owners; mobile dispatch is reserved for repair shops, body shops, transmission shops, and dealerships, and the trip charge is never quoted to an owner.
What if my shop is too far for dispatch?
That is the normal situation for San Marcos, and it is why remote J2534 programming is our first suggestion there: we run the OEM session from our shop through your J2534 pass-thru or compatible Autel tool with no trip charge and no downtime waiting on a truck. Mail-in bench covers anything that has to come out of the vehicle — boot-mode reads, EEPROM repair, cloning, TCM unlocks, BMW DME ISN, the Mercedes ESL emulator. Both lanes serve the US and Canada.
Dispatch us to your San Marcos bay.
Call with the OEM, module, and fault codes. Same-day service may be available depending on platform, schedule, parts, and security requirements.