Check engine light, engine derate, ABS fault, DOT lighting violation — electrical problems stop your truck just as effectively as mechanical ones. We bring professional J1939 diagnostic equipment and wiring tools to your location in Austin and surrounding Texas, 24/7.
Electrical problems can develop rapidly or appear suddenly. These symptoms mean your truck's electrical system needs attention now.
Check engine or MIL light on — active fault codes requiring diagnosis
Engine entered reduced power (derate) mode
ABS or ATC warning lights illuminated on the dash
No-start condition with batteries that test good
Trailer lights not functioning — 7-pin connection fault
DOT lighting violation — brake lights, markers, clearance lights
Intermittent electrical failures that only occur while driving
We use professional-grade J1939/CAN bus diagnostic scanners that read fault codes across all major commercial truck platforms — not generic OBD readers. Our equipment communicates with the engine ECM, transmission TCM, ABS module, aftertreatment system (DPF/DEF/SCR) and body controller.
Fault codes tell you what failed — circuit testing tells you why. We perform voltage drop tests, resistance measurements and continuity checks to trace wiring problems to the source rather than replacing components that are actually functional.
Engine Derate Warning: Do not assume a derate will clear itself. Derates are the ECM protecting the engine from serious damage. Common causes: DPF soot overload, DEF quality issues, low coolant pressure, high crankcase pressure, and sensor failures. We read the exact fault and advise on the fastest resolution.
A failed brake light, clearance light or marker light is an immediate Out of Service violation. We carry LED replacement lights for the most common semi and trailer configurations and restore DOT compliance on-site. Trailer electrical problems — ABS lights, wiring shorts, 7-pin connector failures — are diagnosed and repaired on location.
Failed sensors that have triggered warning lights can often be replaced on-site without returning to a shop. Common roadside sensor replacements include: coolant temperature, MAP/boost pressure, wheel speed (ABS), exhaust back pressure and NOx sensors.
DOT lighting: brake lights, markers, clearance lights
7-pin trailer connector and pigtail replacement
Fuse and relay diagnosis and replacement
Ground strap inspection and replacement
DPF forced stationary regeneration
Call or WhatsApp right now — a real mechanic answers 24/7. We dispatch immediately anywhere within 30 miles of Hutto, TX.