Services
CA HD I/M Testing
California Heavy-Duty Inspection and Maintenance (HD I/M) testing for commercial diesel trucks. We perform official smog inspections to keep your fleet compliant with CARB regulations.
Keep Your Trucks CARB Compliant
California's Heavy-Duty Inspection and Maintenance (HD I/M) program requires periodic emissions testing for commercial diesel vehicles operating in the state. Failing to maintain compliance can result in fines, registration holds, and vehicles pulled from service. Our certified technicians perform HD I/M smog inspections efficiently so you can stay on the road and avoid costly penalties.
Credentialed HD I/M Tester
What Our HD I/M Testing Covers
Official HD I/M Smog Inspection
State-certified emissions testing for Class 4–8 diesel trucks required under California's Heavy-Duty Inspection and Maintenance (HD I/M) program.
Opacity / Smoke Test
Exhaust opacity measurement to verify your diesel engine meets California's visible smoke emission limits under loaded and snap-acceleration conditions.
Pre-Test Inspection
Quick pre-inspection to identify obvious issues — DPF condition, exhaust leaks, visible smoke — before the official test so you're not surprised by a failure.
Emission System Check
Verification that required emission control equipment — DPF, EGR, DEF/SCR systems — is present, unmodified, and functioning as required by CARB.
Failure Diagnosis & Repair
If your truck fails the HD I/M test, we diagnose the root cause and perform the necessary repairs to bring it into compliance and pass re-inspection.
Fleet Testing
Scheduled HD I/M testing for fleets of multiple vehicles. We coordinate inspections to minimize downtime and keep your entire operation compliant.
Don't Risk a Failed Inspection
Schedule your CA HD I/M smog test with us. We'll get your truck through inspection quickly — and handle any repairs needed to pass.