2001 Hummer Model Year changes.

One of the most visible changes for the 2001 model year is the larger mirrors first seen on the 2000 Slantback. They offer enhanced visibility and are heated. 17" alloy wheels were offered for the first time in '01 and the Monsoon radio was available in Open Top models for the first time. The 6.5L engine supply from AM General's new manufacturing subsidiary, General Engine Products LLC, began showing up in Hummers mid year 2001 and are distinguished by a change in the 4th digit of the VIN from "Z" to "F". A welcome change for long time Hummer owners was a substantial upgrade to the Idler and Pitman arms. Many older Hummers have upgraded to these much improved components. Other changes included armrests on the rear seats, new door armrests and a revised dash layout.

Powertrain and Identification Information. VIN 10th Digit designating year = "1" Engine: 6.5L Turbo Diesel 195 H.P. 430 lb. ft. VIN 4th digit ="Z" or "F" designating General Engine Products as the manufacturer (later production). 4L80E Electronic 4 speed Automatic Transmission. VIN 5th digit ="A" Top Speed 83+ mph. 869 '01 models built.

Significant changes for 2001. Heavy duty Idler and Pitman Arms. New Tan Seat fabric. New Seals in Geared Hubs. New Door Armrests. New Beltline Window seals. New Seat Pedestals.  Monsoon stereo with overhead speakers now available in Open Top models.  Optional 17" Alloy wheels available. 16.5" Alloy wheel discontinued. Armrests added to the rear seats for increased passenger comfort. New larger heated power mirrors with convex insert available. Dash layout enhanced for better visibility of gauges. New Color: Ocean Blue Metallic. W8 "Gloss White" Discontinued. November 2001 Introduction of the "K" Series for fleet and government applications. New Engine Assembly Manufactured by General Engine Products LLC. Enhanced engine block- Turbo Diesel Engines with block castings before May 1999 are susceptible to #8 cylinder cracks. Most frequently the first symptom of a cylinder crack is coolant being forced out of the cooling system causing the "check coolant" light to illuminate. Many engines have been replaced with blocks of the same design. Even though the enhanced blocks were first produced in May 1999 it took some time before they made their way through the system and into Hummers as either original equipment or for replacement. Even Hummers produced in 2000 are likely to have the pre-May 1999 block casting. There is a casting number on the right rear of the block under the cylinder head which should be E_99 (May 1999) or later. Unfortunately the codes changed through the years so identifying the enhanced blocks is even more difficult. Later blocks also use metric bolts to attach the bell housing but it is unclear whether this clearly identifies an enhanced block. Although enhanced blocks were installed in Hummers produced before the engine manufacturer change to General Engine Products (GEP), the easiest way to make sure a Hummer left the factory with an enhanced block is to check the 4th digit of the VIN on 2001 and later 6.5L turbo diesels. If the 4th digit is an "F" the engine was produced by GEP and is sure to have the enhanced block from the factory.

New Dash.

Open Top Monsoon.

17" Wheel.

Rear Armrests.

Heated Mirrors.

'01 Specifications, options & Prices:

Available colors:

Ocean Blue. New Color for '01.

Pewter Metallic.

Competition Yellow.

Candy Apple Red.

Black. (B9)

Bright White. (W14)

Woodland Green. ('00 shown)

Silver Metallic. (S15) ('00 with '01 wheels shown)

Mesa Dusk. ('99 shown)

Body Styles Available in '01:

HMCS. 4-Passenger Wagon

HMC4. 4-Passenger Hard Top (last year).

HMCO. 4-Passenger Full Door Open Top.

XLC2. 2-Passenger Hard Top Enlarged Cab. (last year). '95 shown.

TOTAL PRODUCTION COUNT BY MODEL AND COLOR. "X" Colors are "Experimental" or special order, often seen as production colors in later years.

COLOR FULL DOOR OPEN TOP (HMCO) WAGON (HMCS) HARD TOP (HMC4) 2-Passenger Fleet (KSC2) 2-PASS. ENLARGED CAB (XLC2) TOTAL B9 (Gloss Black) 64 125 20 1 210 C22 (Mesa Dusk) 6 15 1 22 G23 (Woodland Green) 21 24 1 46 L24 (Ocean Blue Metallic) 45 32 2 79 P33 (Pewter) 53 99 12 164 R19 (Candy Apple Red) 40 37 8 1 86 R37 1 1 R7 (Gloss Red) 1 1 1 3 S15 (Silver) 15 27 4 46 W14 (Bright White) 36 60 8 104 W41 1 1 Y20 (Competition Yellow) 58 33 6 1 98 X02 (Safety Green) 1 1 X21 (Safety Green) 2 2 X40 (Marine Corp Red) 6 6 Tan Interior 83 110 19 212 Gray Interior 255 344 52 1 5 657 Cloth 259 424 58 3 744 Military 1 1 Vinyl 79 30 13 2 124 TOTAL 338 454 71 1 5 869

© Copyright 2004 Jim Lynch.