CARB Compliance Testing for Commercial Diesel Fleets
Professional compliance testing for Class 6, 7, and 8 diesel trucks serving Phoenix, Chandler, and surrounding Arizona fleet operations.
Testing appointments are for compliant, test-ready vehicles only. This is a compliance testing service only, not a diagnostic or repair appointment.
partnering with the brands you trust
Do Not Schedule Testing for Trucks With Active Issues
Active check engine lights
Active emissions faults
DEF or DPF warnings
Derate conditions
Active fault codes
Known emissions-related problems
Incomplete repairs
Repairs must be completed before scheduling a testing appointment.
What “Test-Ready” Means
Before scheduling, vehicles should meet the following conditions:
No active check engine light
No active emissions codes
No derates
Running properly
Repairs already completed
Vehicle driven after repairs
Ready for compliance testing
Testing appointments are for compliant, test-ready vehicles only.
Credentialed Clean Truck Check Testing Provider
KTS Diesel provides official Clean Truck Check testing for commercial diesel vehicles operating out of Phoenix and Chandler.
Our role is straightforward:
Perform compliance testing
Submit testing results properly
Provide efficient fleet testing support
We are not performing diagnostics or repairs during testing appointments.
Testing appointments include:
Clean Truck Check testing
Commercial diesel emissions compliance testing
Fleet testing support
Compliance result submission
Compliance Testing Only
What This Service Does NOT Include
Diagnostics
Troubleshooting
Repairs during testing
Fault code analysis
Emissions system repairs
Attempting to “help pass” failing trucks
We do not guarantee passing results.
What This Service Does NOT Include
Diagnostics
Troubleshooting
Repairs during testing
Fault code analysis
Emissions system repairs
Attempting to “help pass” failing trucks
We do not guarantee passing results.
Carb Testing Service: What You Need to Know
Carb Testing Service: What You Need to Know
-
CARB testing helps verify that diesel trucks and emissions systems are operating within required emissions standards. It focuses on components such as the DPF, DEF, SCR, sensors, and aftertreatment systems that affect emissions performance and road readiness.
-
Emissions-related issues can quickly lead to downtime, failed inspections, warning lights, derates, and expensive repairs. Regular testing helps fleets identify problems early before they impact operations.
-
KTS Diesel works on commercial diesel fleets including:
Class 6 trucks
Class 7 trucks
Class 8 semi trucks
Box trucks
Day cabs
Sleeper trucks
Fleet service vehicles
We support fleets operating throughout Phoenix, Chandler, and surrounding areas.
-
If your truck is showing any of the following symptoms, emissions diagnostics may be needed:
Check engine light
DPF warning light
Frequent regens
Loss of power
DEF system faults
Derate conditions
Poor fuel efficiency
Excessive smoke or emissions-related fault codes
-
KTS Diesel provides:
Diesel emissions diagnostics
DPF diagnostics and repair
Forced regens
DEF system diagnostics
SCR system troubleshooting
Fault code diagnostics
Sensor testing
Aftertreatment repairs
Preventive fleet inspections
Mobile and in-shop service
-
Fleet managers choose KTS because we understand that downtime affects scheduling, deliveries, drivers, and revenue.
Our team focuses on:
Fast turnaround
Accurate diagnostics
Clear communication
Fleet-focused service
Mobile support available
Preventive maintenance mindset
Keeping trucks on the road
-
Whether you manage a small fleet or multiple commercial trucks, KTS Diesel helps keep your vehicles compliant, operational, and ready for the road.