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General Motors manufactured the Hummer H3 SUV variant from 2005 to 2010 which concluded the Hummer vehicle series after H1 and H2 completion. The Hummer H3 stands as the smallest Hummer model and utilizes the GMT355 platform that powers both the GMC Canyon and Chevrolet Colorado vehicles. Customers had two vehicle options in the Hummer lineup between the H3 SUV with four doors and the H3T pickup truck design. From 2006 to 2007 the vehicle came standard with a 3.5-liter inline-five offering 220 hp before the 3.7-liter inline-five with 242 hp became the default choice for 2007 through 2010. The H3 Alpha came with a 5.3-liter V8 engine delivering 300hp from 2008 to 2010. H3 engines worked with a selection of 5-speed manual or 4-speed automatic transmissions based on the engine type. The H3 showed strong off-road capability through four-wheel-drive mechanisms together with low-range transfer cases in addition to locking differentials and traction control. With its capability to wade through water depths up to 27 inches at 5 mpg the vehicle possessed a maximum ground clearance of 16 inches to conquer challenging landscapes. Even though the H3 was more basic it included heated leather seats and a navigation system as convenience features. Device owners who use original Hummer H3 components will experience factory-standard performance capabilities alongside enduring dependability.
Hummer H3 consolidates common concerns into engine valvetrain, evaporative emissions and electronic throttle control. On the engine, H3 may misfire at idle or cruise and turn the warning lamp on. Worn valve seats leak compression, particularly when restarting a hot engine, and may need replacing the cylinder head on the H3. With a compression test, leak down, and borescope, identify and correct valve seats and seals. In emissions, Hummer vehicles tend to have a light glowing after refilling or on seasonal changes. A damaged/broken EVAP seal, loose or cracked gas cap triggers small leak diagnostics. Visually examine the filler neck, replace the cap, diagnose and delete codes, and reprise the H3 readiness cycle. In throttle control, the H3 shows reduced power with code P2135 and poor response. A faulty throttle position sensor or damaged connector distorts dual tracks correlation. Check five volt references and grounds, repair wiring, then install and verify smooth adaptation of a new sensor. All this makes Hummer drivability more predictable, backs up warranty records, and avoids repeat equipment. Use Hummer service data and end with a clean road test so H3 works properly.