1991 GMC B6 Medium Duty Problems
Owner-reported complaints filed with NHTSA, grouped by component
Data refreshed
What this page shows
Everything below is an owner-reported complaint submitted to NHTSA about the 1991 GMC B6 Medium Duty, grouped by the component NHTSA recorded on the report. These are not confirmed defects, and they are not recalls. NHTSA does not verify most reports before publishing them, and a category with more reports in it is not evidence that a part is defective.
Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.
Reports by component
Ranked by how many owner reports name each component category
- Engine1100.0%
Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.
Each component in detail
What the reports in each category say, in the owners' own words
Engine
Reports naming the engine itself — including stalling, misfires, oil consumption, cooling and internal engine components.
From owner reports, verbatim
THE VEHICLE EXPERIENCED ENGINE FAILURE FOR THE SECOND TIME. HE STATED THAT THE FIRST TIME WAS 11/99. THE ENGINE HAD 118,000 MILES. HE STATES HE ASKED THE MANUFACTURER FOR ASSISTANCE AND THEY DECLINED BECAUSE OF A TECHNICALITY. HE ALSO STATED THAT THE MANUFACTURE SHOULD REPLACE HIS ENGINE BECAUSE HE SAID THAT WHEN HIS ORIGINAL ENGINE WAS REPLACE THE MECHANIC USED PARTS FROM THE OLD ENGINE. *NLM
Too few reports in this category for a page of its own — they appear in the full complaint list.
Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.
Elsewhere on this vehicle
Data sources
- NHTSA Office of Defects Investigation — owner-reported complaints and the components recorded on them
Data on this page last refreshed .