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You’re running a business, not studying CARB regulations. But if your truck isn’t compliant, the DMV blocks your registration. Your truck sits. Your contracts are at risk.
CARB diesel compliance isn’t optional anymore. If you’re operating a 2013 or newer diesel truck over 14,000 pounds in California, you need emissions testing twice a year. Miss it, and you’re looking at fines between $1,000 and $10,000 per day, per vehicle. That’s not a scare tactic—that’s the actual penalty structure.
We handle CARB emissions testing for heavy-duty trucks in Home Gardens and across Riverside County. You bring the truck, we run the OBD test, and you get the documentation you need to stay legal. If your vehicle doesn’t pass or comes back “not ready,” we retest at no charge. You’re not paying twice for the same problem.
This isn’t about upselling you services you don’t need. It’s about keeping your truck on the road and your business moving.
All SMOG Motors is a CARB credentialed testing facility serving Home Gardens, CA and the surrounding Riverside County area. We’re not a mobile operation charging extra fees or cutting corners. We’re a local shop with the equipment, training, and credentials required by the state to perform compliant OBD testing on 2013 and newer diesel engines.
Home Gardens sits in the heart of California’s logistics corridor—55 miles east of Los Angeles, 85 miles north of San Diego. Manufacturing, construction, and freight dominate the local economy here. That means heavy-duty trucks. And heavy-duty trucks mean CARB compliance requirements.
We know what you’re dealing with because we work with truck owners and small fleet operators every day. You’re not getting a sales pitch. You’re getting a clear answer, a fast turnaround, and documentation that holds up when CARB or the DMV comes asking.
You schedule an appointment or stop by with your truck. We verify the year, make, model, and GVWR to confirm it qualifies under the 2013+ and 14,000+ pound requirements. This service doesn’t apply to older trucks or lighter vehicles—so if your truck doesn’t meet those specs, we’ll tell you upfront.
Next, we connect to your truck’s OBD system using CARB certified testing equipment. The test checks emissions data directly from your engine’s onboard diagnostics. We’re looking for readiness monitors, fault codes, and emissions performance. The test takes about 20 to 30 minutes in most cases.
If your truck passes, you get your certificate right away. We submit the results to CARB, and you’re clear for the next testing cycle. If it doesn’t pass or the system shows “not ready,” we’ll explain what’s flagged and retest once you’ve addressed it—no extra testing fee.
You walk out with documentation proving compliance. That’s what stops the DMV from blocking your registration and keeps you off CARB’s enforcement radar.
Ready to get started?
California’s clean truck check program applies to all heavy-duty diesel trucks with a 2013 or newer engine and a gross vehicle weight rating over 14,000 pounds. Right now, you need testing twice a year. By October 2027, that increases to four times a year for OBD-equipped vehicles.
You also owe an annual compliance fee—$31.18 for 2025, $32.13 for 2026. That fee is separate from testing, and it’s non-negotiable. CARB tracks compliance through DMV registration data and roadside monitoring devices. If your truck gets flagged, you receive a Notice to Submit to Testing. You have 30 days to respond. Ignore it, and your registration gets blocked.
This applies whether your truck is registered in California or out of state. If you’re operating in California, you’re subject to California rules. Shippers can also be fined up to $10,000 per year for hiring non-compliant carriers, so this affects your ability to get contracts, not just your ability to register.
Home Gardens is a hub for logistics and freight. Trucks move through here daily, and CARB knows it. Enforcement is active in Riverside County. You don’t want to be the one pulled over or flagged at a weigh station because your compliance lapsed.
No. The current CARB emissions testing requirement only applies to diesel trucks with 2013 or newer engines and a GVWR over 14,000 pounds.
If your truck has a 2012 or older engine, you’re not subject to the semi-annual OBD testing under this program. You may still have other CARB requirements depending on your operation—like the Truck and Bus Regulation—but the twice-yearly clean truck check doesn’t apply.
If you’re not sure what year your engine is, check your vehicle registration or the engine serial number plate. We can also help verify eligibility when you contact us. Don’t assume you need testing just because you drive a heavy-duty truck. The year and weight matter.
Right now, you need CARB emissions testing twice a year if your truck is a 2013 or newer diesel over 14,000 pounds GVWR. That’s the current requirement as of 2025.
Starting in October 2027, the frequency increases to four times per year for OBD-equipped vehicles. CARB is phasing in more frequent testing to tighten emissions monitoring across California’s heavy-duty fleet.
You’ll also need to pay an annual compliance fee and respond within 30 days if you receive a Notice to Submit to Testing from CARB enforcement. Missing a test or ignoring a notice can result in registration blocks and fines starting at $1,000 per day, per vehicle. Set reminders. Track your test dates. This isn’t something you can let slide.
If your truck fails, we’ll explain what triggered the failure—whether it’s a fault code, an emissions reading, or readiness monitors that aren’t set. You’ll need to address the issue before retesting.
In most cases, that means taking your truck to a diesel mechanic to diagnose and repair the problem. Once the repair is done and the system is ready, bring it back. We retest at no additional charge.
If your truck comes back “not ready” instead of failing outright, that means the OBD system hasn’t completed its self-checks yet. You may need to drive the truck through a specific drive cycle to reset the monitors, then return for testing. We’ll walk you through what’s needed. You’re not stuck paying for multiple tests because the system wasn’t ready the first time.
Yes. CARB compliance requirements apply to any heavy-duty diesel truck operating in California, regardless of where it’s registered.
If you’re an out-of-state carrier running loads through California, your 2013+ diesel truck over 14,000 pounds GVWR still needs to meet the state’s emissions testing requirements. CARB uses roadside monitoring and license plate readers to flag high-emitting vehicles, and out-of-state plates don’t exempt you.
You’ll need to complete the same semi-annual testing and pay the same compliance fees as California-registered trucks. If you get a Notice to Submit to Testing, you have 30 days to comply no matter where your truck is registered. We can test your vehicle and provide the documentation you need to stay compliant while operating in California.
Testing costs vary depending on the provider, but you’re typically looking at $50 to $75 per test in the Home Gardens and Riverside County area. That covers the OBD emissions test, the certificate if you pass, and submission of results to CARB.
The annual compliance fee is separate—$31.18 for 2025, increasing to $32.13 for 2026. You pay that directly to CARB, not to the testing facility.
If your truck doesn’t pass or shows “not ready,” we retest at no charge once you’ve addressed the issue. You’re not paying twice for the same test cycle. Some mobile testing services charge more and may not carry proper insurance or credentials. We’re a credentialed facility with certified equipment, so you know the test results will be accepted by CARB and the DMV.
CARB can fine you between $1,000 and $10,000 per day, per vehicle for non-compliance. That’s not a one-time penalty—it’s daily until you’re compliant.
On top of fines, the DMV will block your registration. That means your truck can’t legally operate in California until you complete testing and submit proof of compliance. If you’re under contract or running regular routes, that’s lost income and potentially lost clients.
Shippers can also be fined up to $10,000 per year for hiring non-compliant carriers, so your non-compliance affects your ability to get work. CARB uses roadside emissions devices and automated license plate readers to screen for high-emitting vehicles. If your truck gets flagged, you’ll receive a Notice to Submit to Testing. You have 30 days to respond. Ignoring it doesn’t make it go away—it makes it worse.
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