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Electrical systemPart report

2004 Hummer H2 Electrical system Problems

Complaints
14about this part
Share
24%of 59 total for the year
Median mileage
98,720miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 14 complaints about the electrical system of the 2004 Hummer H2, 24% of the 59 complaints for this model year. Where a mileage was given, the median is 98,720 miles. 1 a fire, according to the filers.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“I am having a problem with my Hummer 2004. The lock light comes on and my Hummer will not start. This is so horrible the problem started about 3 months ago. Everytime that light comes on I have to waite 15to 25 minutes for it to start again.”

NHTSA complaint #11139109, filed 2018-10, 165,975 miles

“As I was driving on I 5 in oregon I experienced a complete failure of the electrical system and brake systems. The vehicle was on cruise control and when I disengaged it all of the safety warning light appeared on the dashboard. I pressed on the brakes and they were a complete failure also. At this time the dashboard lights and controls went off and I loss power. I was able to get to the side of the road when I noticed smoke coming from under the hood. I got my daughter out of the vehicle to a safe distance and opened the hood and the main fuse relay panel was fully engulfed in fire. …”

NHTSA complaint #11022893, filed 2017-09, 111,644 miles

“I own a 2004 Hummer H2. It currently has 50k miles on it and has been garage kept and well maintained since I purchased it. Recently, while driving I noted that my speedometer seemed to be inaccurate. I was on a major highway, yet cars were flying around me and cutting me off. I looked at my speedometer again and it read 65 so I continued about my business while other motorists were still passing me by and cutting me off. When I got home and pulled the H2 into the garage, I realized the speedometer was still reading 65 and I was parked. …”

NHTSA complaint #10299968, filed 2010-01, 50,000 miles

“Odometer Fraud. The contact purchased a 2004 Hummer H2. The contact discovered a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of purchase, the vehicle mileage was 200,000. It was later discovered that the mileage on the Title was 210,000. Additionally, the contact stated she felt pressured to purchase the vehicle, signed the contract, and was unable to recoup the funds.”

NHTSA complaint #11717047, filed 2026-02, 210,000 miles

“Whole cluster lights up on car door locks don't work radio won't go off air bag lights on all brake lights on , this was going down a city street driving”

NHTSA complaint #11180590, filed 2019-02, 122,000 miles

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
2008229%
2007327%
2006418%
20052734%
20041424%
20032417%

Other parts of the 2004 Hummer H2

Brakes
14 complaintsVisibility (wipers, defrost, mirrors)
13 complaintsSteering
6 complaintsAir bags
3 complaintsBody and structure
3 complaintsSuspension
3 complaintsElectronic stability control
2 complaintsEngine
2 complaintsOther or unknown
2 complaintsTransmission and drivetrain
2 complaintsEngine cooling
1 complaintsEquipment
1 complaints

← All problems reported for the 2004 Hummer H2

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology