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#BS-1999-PONBON-6AC4

1999 Pontiac Bonneville

Based on reports from 176 owners and 4 recalls for this exact model.

Complaints
176
Crashes
9
Fires
9
Recalls
4
TSBs
60
🟡

Preliminary Verdict

Think Twice

Based on 176 complaints, 9 crashes, 9 fires, and 4 recalls.

See full verdict with buy/skip conditions

Top reported problems

1

head gasket failure

1 complaints • Severity 10/10

$X,XXX
2

engine failure

1 complaints • Severity 10/10

$X,XXX
3

transmission failure

1 complaints • Severity 8/10

$X,XXX

Preview: What's in your full report

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Mechanic Inspection Checklist

!Check the Engine And Engine Cooling:engine:gasolineHIGH

18 owners reported engine and engine cooling:engine:gasoline issues — failures commonly reported around 70K miles.

!Inspect the Engine And Engine Cooling:engineMED
Look for symptoms of wear and premature failure
+ 6 more items in full checklistUnlock

Failure Timeline by Mileage

4
0–30K
20
30–60K
19
60–90K
12
90–120K
11
120–150K
3
150K+

Peak failure range: 30–60K miles (20 reports) • Median: 70K miles

Full report: which components fail at each mileageUnlock

30,000-Mile Cost Projection

Best Case

$X,XXX

Most Likely

$X,XXX

Worst Case

$X,XXX

Top cost driver: Engine And Engine Cooling:engine:gasoline (18 reports).

Includes fuel costs, common repairs, and recall riskUnlock

Also in your report

Owner Intelligence

AI-synthesized themes from real complaints

Buyer Lot Checklist

Questions, test drive checks, walk-away triggers

Negotiation Talking Points

Data-backed dollar deductions

Buy / Skip Verdict

Final recommendation with conditions

10 sections total in the full reportUnlock all

Where the complaints fall

Engine And Engine Cooling:engine:gasoline18 (10%)
Engine And Engine Cooling:engine13 (7%)
Engine13 (7%)
Fuel System9 (5%)
Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe7 (4%)
Electrical System:ignition6 (3%)
Power Train:automatic Transmission6 (3%)
Engine And Engine Cooling:cooling System6 (3%)

1999 Pontiac Bonneville: Known Issues & Problem Areas

Engine And Engine Cooling:engine:gasoline Issues

Engine And Engine Cooling:engine:gasoline complaints account for 10% of all reports filed for the 1999 Pontiac Bonneville, with 18 owners filing complaints with NHTSA. The median mileage at time of complaint is 70,096 miles, suggesting issues tend to surface around the 70K-mile mark.

Engine And Engine Cooling:engine Issues

Engine And Engine Cooling:engine complaints account for 7% of all reports filed for the 1999 Pontiac Bonneville, with 13 owners filing complaints with NHTSA. Owners should pay attention to engine and engine cooling:engine-related symptoms during test drives and pre-purchase inspections.

Engine Issues

Engine complaints account for 7% of all reports filed for the 1999 Pontiac Bonneville, with 13 owners filing complaints with NHTSA. Owners should pay attention to engine-related symptoms during test drives and pre-purchase inspections.

Fuel System Issues

Fuel System complaints account for 5% of all reports filed for the 1999 Pontiac Bonneville, with 9 owners filing complaints with NHTSA. Owners should pay attention to fuel system-related symptoms during test drives and pre-purchase inspections.

Data sourced from NHTSA owner complaints and community reports. The full report analyzes severity, repair costs, and failure patterns for each category.

Complaint trend by year

25
00
28
01
17
02
21
03
27
04
6
05
8
06
2
07
5
08
3
09
1
10
8
11
2
13
4
14
3
16

Complaints filed with NHTSA by year for the 1999 Pontiac Bonneville. Recent trend: stable.

Don't negotiate blind — know what this car costs to own

Repair costs • Negotiation scripts • Mechanic checklist • Buy/skip verdict

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Recall History (4 recalls)

04V090000Jun 2004

FUEL SYSTEM, GASOLINE:DELIVERY

ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH 3800 V6 (L36) ENGINES AND CERTAIN DELPHI FUEL PRESSURE REGULATORS, THE REGULATORS HAVE A MUCH HIGHER THAN USUAL RATE OF FUEL LEAKS. A LEAK CAN ALLOW FUEL TO ENTER THE INTAKE MANIFOLD THROUGH A VACUUM LINE. IF THE ENGINE DOES NOT START WHEN CRANKED, THE FUEL FROM THE LEAKING REGULATOR AND A MISTIMED SPARK CAN CAUSE A BACKFIRE.

09E012000May 2009

EXTERIOR LIGHTING

SABERSPORT IS RECALLING 16,270 COMBINATION CORNER AND BUMPER LAMP ASSEMBLIES OF VARIOUS PART NUMBERS SOLD FOR USE AS AFTERMARKET EQUIPMENT FOR VARIOUS PASSENGER VEHICLES. THESE HEADLAMPS FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THESE LAMPS DO NOT CONTAIN THE REQUIRED AMBER SIDE REFLECTORS.

99V072000May 1999

WHEELS

VEHICLE DESCRIPTION: PASSENGER VEHICLES EQUIPPED WITH CHROME PLATED ALUMINUM WHEELS. SOME OF THESE WHEELS HAVE A MOUNTING SURFACE THAT WAS NOT MACHINED CORRECTLY, CAUSING THE WHEEL STUDS TO BREAK.

99V089000May 1999

POWER TRAIN:AUTOMATIC TRANSMISSION

VEHICLE DESCRIPTION: PASSENGER VEHICLES EQUIPPED WITH 4T65E AUTOMATIC TRANSMISSIONS. THESE VEHICLES FAIL TO CONFORM TO THE REQUIREMENTS OF FMVSS NO. 102, "TRANSMISSION SHIFT LEVER SEQUENCE." A RETAINING CLIP, WHICH SECURES THE MANUAL VALVE TO THE LINKAGE OF THE TRANSMISSION DETENT LEVER, CAN BECOME LOOSE UNDER A COMBINATION OF POSSIBLE DRIVER SHIFTING MANEUVERS AND ALLOW THE LINK TO BECOME DISCONNECTED FROM THE MANUAL VALVE.

Recall severity analysis & seller scripts

The full report rates each recall's severity and gives you scripts for asking the seller about recall completion.

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The worst model year for the Pontiac Bonneville is the 2000 — worth knowing if you're cross-shopping years. The biggest problem area is windows / windshield.

1999 Pontiac Bonneville vs. Class Average (Large Cars)

This vehicle

176

Class avg

249

Complaint volume is roughly in line with other large cars vehicles from 1999.

Complaint counts correlate with sales volume — popular vehicles naturally generate more reports. The full report normalizes for this.

About this data

NHTSA Complaints

Federal database of owner-filed safety complaints. 176 records for this vehicle.

NHTSA Recalls

Manufacturer-issued safety recalls. 4 recalls found for this vehicle.

Repair Cost Data

Real-world repair costs from owner reports and independent databases.

Other Pontiac Bonneville Model Years

20052004200320022001200019991998199719961995199419931992199119901989198819871986198519841983198219811980197919781977197619751974197319721971197019691968196719661965
View all Pontiac Bonneville years →

1999 Pontiac Bonneville: Frequently Asked Questions

What is the most common problem with the 1999 Pontiac Bonneville?
The most commonly reported issue with the 1999 Pontiac Bonneville is related to the engine and engine cooling:engine:gasoline, with 18 complaints filed with NHTSA.
Is the 1999 Pontiac Bonneville reliable?
The 1999 Pontiac Bonneville has 176 complaints, 9 crash reports, and 9 fire reports filed with NHTSA. The full report analyzes whether these numbers indicate real risk or are proportional to the vehicle’s popularity.
How much does it cost to fix 1999 Pontiac Bonneville problems?
Repair costs vary by issue. The full BumperScan report includes detailed repair cost estimates (low/median/high) for every major issue, plus a 30,000-mile total cost of ownership projection.
Does the 1999 Pontiac Bonneville have any recalls?
Yes, the 1999 Pontiac Bonneville has 4 recalls on record. The full report includes recall severity analysis and scripts for asking the seller about recall completion.
What mileage do Pontiac Bonneville problems start?
Based on 69 complaints with mileage data, the median mileage at time of complaint is 70,096 miles. The highest concentration of reported issues occurs in the 30–60K mile range. The full report breaks down exactly which components fail at each mileage bracket.
What’s in the full report?
10 sections of AI analysis: severity-ranked issues, component scores (0-100), 30K-mile cost projection, failure timeline by mileage, recall details with seller scripts, owner sentiment analysis, mechanic checklist, buyer lot checklist, negotiation ammo with dollar figures, and a buy/skip verdict.
How is this different from free NHTSA data?
NHTSA gives you raw complaint text. BumperScan cross-references 2.1M+ complaints with community repair cost data, EPA fuel data, and recall records — then uses AI to synthesize it into actionable advice with dollar figures.
How is this different from Carfax?
Carfax is VIN-specific history ($45/report). BumperScan is model-level reliability intelligence — what problems this car is known for, what they cost, and whether you should buy it. Complementary, not competing.
What if the report isn’t useful?
100% money-back guarantee. If the report doesn’t help you make a more informed decision, we’ll refund you — no questions asked.
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10 sections of AI analysis based on 176 owner reports. Know before you buy.

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