---
title: "CAP City Diesel Inspections — Clean Truck Check, Auburn, CA"
description: "CAP City Diesel Inspections in Auburn, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing…"
url: "https://ctcfinder.com/tester/cap-city-diesel-inspections-auburn/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# CAP City Diesel Inspections

Clean Truck Check tester in Auburn, CA (Placer County).

> CTC Finder is an independent directory, not affiliated with CARB. Tester data: CARB Clean Truck Check public tester list, last checked November 1, 2026. Confirm services, hours and prices with the tester.

| Field | Value |
|---|---|
| Location | 2945 Bell Rd, Auburn, CA 95603 |
| County | Placer County |
| Phone | (916) 538-7777 |
| Website | carbdieseltest.com |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks CAP City Diesel Inspections can test

| Your vehicle | Test required | This tester |
|---|---|---|
| Diesel, model year 2013 or newer | OBD scan | Yes |
| Alternative fuel (natural gas, propane), 2018 or newer | OBD scan | Yes |
| Diesel, model year 2012 or older (no OBD) | Smoke opacity test (SAE J1667) plus visual inspection | Yes |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

## Clean Truck Check testers in Placer County

CAP City Diesel Inspections is one of 39 testing businesses in Placer County on CARB's public tester list. 36 of them offer mobile testing and 22 do smoke opacity tests. In Auburn itself there are 7 listed businesses, 7 of them mobile.

## When your truck is due

Most trucks test twice a year, on a schedule tied to the DMV registration expiration date. CARB says OBD trucks move to four tests a year beginning October 2027. California-registered (non-commercial) motorhomes and agricultural vehicles test once a year. See the [deadline guide](https://ctcfinder.com/guide/deadlines-2026-2027/). You can test up to 90 days before a deadline. Free email reminders: https://ctcfinder.com/reminders/

## Frequently asked questions

### Does CAP City Diesel Inspections offer mobile Clean Truck Check testing?

Yes. CAP City Diesel Inspections says on CARB's tester list that it offers mobile testing, so it can come to your yard or job site. Ask about a trip fee when you call.

### Can CAP City Diesel Inspections test a 2012 or older diesel truck?

Yes. CAP City Diesel Inspections lists smoke opacity testing, the test CARB requires for diesel trucks of model year 2012 and older (no OBD). See [OBD vs smoke opacity](https://ctcfinder.com/guide/obd-vs-smoke-opacity-test/).

### How much does CAP City Diesel Inspections charge for a Clean Truck Check?

CAP City Diesel Inspections has not published prices with us; call (916) 538-7777 for a quote. Published California prices are usually $50–$135 per vehicle for an OBD test and $190–$200 for a smoke opacity test, plus CARB's annual fee ($32.13 in 2026). See the [cost guide](https://ctcfinder.com/guide/cost/).

### Is CAP City Diesel Inspections a CARB-credentialed tester?

CAP City Diesel Inspections appears on CARB's public Clean Truck Check tester list, last checked November 1, 2026. Only credentialed testers can submit results to CARB; after the test, confirm the passing result shows for your vehicle in CTC-VIS.

## Other testers nearby

- **[CARB Compliant Mobile Testing](https://ctcfinder.com/tester/carb-compliant-mobile-testing-auburn/)** — 11590 Stonebrook Dr, Auburn, CA 95603 — (916) 572-4917 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Juan Renderos](https://ctcfinder.com/tester/juan-renderos-auburn/)** — Auburn, CA 95603 — (949) 547-2585 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Lightfoot Mobile Truck Emissions](https://ctcfinder.com/tester/lightfoot-mobile-truck-emissions-auburn/)** — 12345 Hyde Park Ln, Auburn, CA 95603 — (916) 849-0426 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Motorhome/Truck test](https://ctcfinder.com/tester/motorhome-truck-test-newcastle/)** — Newcastle, CA 95658 — (916) 243-5089 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Samuel Nikoto- TRUCK, BUS, RV Mobile Testing](https://ctcfinder.com/tester/samuel-nikoto-truck-bus-rv-mobile-testing-newcastle/)** — Newcastle, CA 95658 — (916) 538-7777 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Allen l Chitty](https://ctcfinder.com/tester/allen-l-chitty-auburn/)** — Auburn, CA 95602 — (916) 225-0454 — 6 mi. Services: mobile testing, OBD testing, motorhome testing.