Best GMC Dealerships in Riverside-San Bernardino, Ranked by CarEdge Data

This is the CarEdge Dealer Transparency Index ranking for GMC dealers in the Riverside-San Bernardino metro. We graded every GMC dealer in the area with enough verified out-the-door quotes to score with confidence — using real PDFs, emails, and signed deals, not Google star ratings.

6 GMC dealers in Riverside-San Bernardino cleared the data threshold this quarter. Here’s how they rank.

About the CarEdge Dealer Transparency Index

Most dealer rankings come from Google star ratings and Yelp reviews — easy to game, impossible to verify. The CarEdge Dealer Transparency Index is different. We score every dealer using verified out-the-door quotes: real PDFs, emails, and screenshots from actual transactions.

Each dealer’s transparency score (out of 100) is weighted across four dimensions:

• Fee Transparency (30%) — Is the doc fee reasonable compared to the state average?
• Add-on Behavior (30%) — How often does the dealer bundle add-ons, and at what cost?
• Price Accuracy (30%) — Does the listing price match the actual OTD price?
• Data Quality (10%) — More verified quotes mean higher confidence in the grade.

Grades: A (90–100), B (80–89), C (70–79), D (60–69), F (below 60).

Top 6 GMC Dealers in Riverside-San Bernardino

Ranked by CarEdge transparency score, highest to lowest. Each dealer profile links to the full review with verified out-the-door quotes.

#1 — Simpson Buick Gmc

Grade: A · Score: 100/100 · Buena Park, CA

Simpson Buick Gmc is the top-graded GMC dealer in the Riverside-San Bernardino metro by verified data — A grade, 100/100, based on 4 verified OTD quotes.

• Doc fee: $85 — well below the CA average of $119
• Add-ons: None detected in verified quotes
• Listing accuracy: 7.1% below the advertised listing
• Verified quotes: 4

See full review & verified quotes →

#2 — Hardin Buick Gmc

Grade: A · Score: 91/100 · Anaheim, CA

Hardin Buick Gmc keeps add-ons on just 8% of verified quotes — light for an A-grade dealer.

• Doc fee: $140 — above the CA average of $119
• Add-ons: 8% of quotes, avg $307
• Listing accuracy: 2.1% above the advertised listing
• Verified quotes: 12

See full review & verified quotes →

#3 — Temecula Valley Buick Gmc

Grade: A · Score: 91/100 · Temecula, CA

Temecula Valley Buick Gmc quotes prices within 0.6% of the advertised listing — one of the cleanest pricing patterns on this list.

• Doc fee: $85 — well below the CA average of $119
• Add-ons: 20% of quotes, avg $650
• Listing accuracy: 0.6% above the advertised listing
• Verified quotes: 5

See full review & verified quotes →

#4 — Costa Mesa Gmc

Grade: B · Score: 88/100 · Costa Mesa, CA

Costa Mesa Gmc earns a solid B on verified data — a doc fee at or below the CA average. The one watch-out: add-ons show on 50% of quotes (avg $710).

• Doc fee: $85 — well below the CA average of $119
• Add-ons: 50% of quotes, avg $710
• Listing accuracy: 5.5% below the advertised listing
• Verified quotes: 8

See full review & verified quotes →

#5 — Hatfield Buick Gmc

Grade: B · Score: 87/100 · Redlands, CA

Hatfield Buick Gmc grades a B: a doc fee at or below the CA average, but add-ons show on 33% of quotes (avg $100) — ask for an itemized OTD.

• Doc fee: $85 — well below the CA average of $119
• Add-ons: 33% of quotes, avg $100
• Listing accuracy: 2.3% above the advertised listing
• Verified quotes: 6

See full review & verified quotes →

#6 — Tustin Buick Gmc

Grade: D · Score: 65/100 · Tustin, CA

Tustin Buick Gmc carries the heaviest warnings on this list — add-ons appear on 86% of verified quotes, averaging $4,298, and quoted prices run 7.2% above the advertised listing. Anchor to the OTD, not the sticker.

• Doc fee: $85 — well below the CA average of $119
• Add-ons: 86% of quotes, avg $4,298
• Listing accuracy: 7.2% above the advertised listing
• Verified quotes: 7

See full review & verified quotes →

Limited Data

These GMC dealers in the Riverside-San Bernardino metro have verified OTD data, but not yet enough to assign a confident grade. We’re actively collecting more quotes for these dealers.

• Caposio Buick Gmc (Victorville, CA) — based on 1 verified OTD quote. View dealer page
• Dutton Buick Gmc (Riverside, CA) — based on 1 verified OTD quote. View dealer page
• Boulevard Buick/Gmc (Signal Hill, CA) — based on 3 verified OTD quotes. View dealer page
• Laguna Niguel Gmc (Laguna Niguel, CA) — based on 1 verified OTD quote. View dealer page
• Thorson Buick Gmc (Pasadena, CA) — based on 2 verified OTD quotes. View dealer page
• Cerritos Auto Square (Cerritos, CA) — based on 0 verified OTD quotes. View dealer page
• Mark Christopher Auto Center (Ontario, CA) — based on 0 verified OTD quotes. View dealer page
• Moss Bros. Auto Group (Moreno Valley, CA) — based on 0 verified OTD quotes. View dealer page

Riverside-San Bernardino GMC Dealer Rankings at a Glance

#	Dealer	City	Grade	Score	Doc Fee	Add-Ons	Quotes
1	Simpson Buick Gmc	Buena Park	A	100	$85	$0	4
2	Hardin Buick Gmc	Anaheim	A	91	$140	$307	12
3	Temecula Valley Buick Gmc	Temecula	A	91	$85	$650	5
4	Costa Mesa Gmc	Costa Mesa	B	88	$85	$710	8
5	Hatfield Buick Gmc	Redlands	B	87	$85	$100	6
6	Tustin Buick Gmc	Tustin	D	65	$85	$4,298	7

These rankings are a quarterly snapshot. For the continuously updated list — including dealers rated since this article was published — see the live GMC dealer rankings near Riverside-San Bernardino on the CarEdge Dealer Transparency Index.

Compare GMC Dealers in Other Metros

CarEdge has graded GMC dealers in 27 US metros using verified out-the-door quotes. Compare other markets:

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How to Use This Data When You Shop

1. Get an OTD quote in writing before you visit. Any dealer can send a worksheet by email — if they won’t, that’s a red flag.
2. Ask for a quote with zero add-ons. Everything in the F&I office is optional. Say “please remove all dealer add-ons” and see what the price does.
3. Anchor to the OTD, not the listing. Dealers with a gap between advertised price and final OTD aren’t being straight with you. Don’t negotiate off the listing number.
4. Compare three dealers minimum. Even within the same metro, doc fees, add-on policies, and listing accuracy vary widely. Use this ranking as your shortlist.

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Rankings are generated from the CarEdge Dealer Transparency Index, a public methodology that scores dealers on verified out-the-door quotes — not Google star ratings or paid placements. Data updated quarterly. Last updated: Q3 2026.