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1999 Hummer H1Recalls, problems, MPG & safety

NHTSA lists 0 safety recalls and 1 owner complaint for the 1999 Hummer H1. Most complaints involve engine and engine cooling (1).

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Combined MPG
—
No EPA rating found
NHTSA overall
—
Not rated by NCAP
Safety recalls
0campaigns
NHTSA
Owner complaints
1
Top: engine and engine cooling
Fuel cost / yr
—
No EPA estimate
01 —Recalls

Safety recalls

NHTSA campaigns for this model year
0 recalls found in NHTSA data for the 1999 Hummer H1 as of Nov 13, 2026.
Data from NHTSA Recalls API · synced Nov 13, 2026NHTSA vehicle page
02 —Complaints

Owner complaints by component

1 complaints filed with NHTSA · Jul 2005 – Jul 2005
  1. Engine and engine cooling1

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

By model year

Complaints for each H1 model year we’ve synced.

View as table
Model yearNHTSA complaints
19991
20021
20034
Crashes reported
0
Fires reported
0
Injuries reported
0
Deaths reported
0
Data from NHTSA Complaints API · synced Nov 13, 2026NHTSA vehicle page
03 —Common problems

What owners report most

Verbatim excerpts from NHTSA complaints, by component

Engine and engine cooling

1 report
“CONSUMER INQUIRED AS TO WHY THERE WAS NOT A RECALL ON THE DEFECTIVE #8 CYLINDER OF THE 1999 HI HUMMER.*MR THE #8 CYLINDER CRACKED RESULTING IN TOTAL ENGINE FAILURE AT 14000 MILES. *NM”
Owner complaint to NHTSAFiled Jul 13, 2005Engine and engine coolingODI 10129110
Send a problem to a mechanic on findmechanic.ai
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 13, 2026
04 —Safety

NHTSA 5-Star Safety Ratings

New Car Assessment Program
NHTSA has not published 5-Star Safety Ratings for the 1999 Hummer H1 as of Nov 13, 2026.
Data from NHTSA NCAP Safety Ratings API · synced Nov 13, 2026
05 —Maintenance

Maintenance basics

General guidance, not the OEM schedule. Check your owner’s manual.
General guidance
ItemMilesTimeNote
Engine oil & filter5,000–10,000 mi6–12 monthsFollow the oil-life monitor if fitted
Tire rotation5,000–7,500 miEvery oil changeCheck pressure monthly
Engine air filter15,000–30,000 mi1–2 yearsSooner in dusty areas
Cabin air filter15,000–25,000 mi1–2 years
Brake fluid—2–3 yearsAbsorbs moisture over time
Coolant60,000–100,000 mi5–10 yearsLong-life coolants last longer
Spark plugs60,000–100,000 mi—Iridium/platinum plugs at the long end
12V battery—3–5 yearsHeat shortens battery life
  • Engine oil & filter5,000–10,000 mi
    6–12 months
  • Tire rotation5,000–7,500 mi
    Every oil change
  • Engine air filter15,000–30,000 mi
    1–2 years
  • Cabin air filter15,000–25,000 mi
    1–2 years
  • Brake fluid—
    2–3 years
  • Coolant60,000–100,000 mi
    5–10 years
  • Spark plugs60,000–100,000 mi
    —
  • 12V battery—
    3–5 years
Typical intervals for modern cars. Severe service (towing, short trips, extreme heat or cold) shortens them.
07 —FAQ

1999 H1 questions

How many recalls does the 1999 Hummer H1 have?

0 recalls found in NHTSA data as of Nov 13, 2026.

What are the most common 1999 Hummer H1 problems?

Owners filed 1 complaints with NHTSA. The most-cited components are engine and engine cooling (1). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.

Data from NHTSA & EPA · synced Nov 13, 2026