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350 platform

2006 Isuzu I

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2006 I.

Body TRUCKTransmission Automatic 4-spd

The 2006 Isuzu I stands as a full-size pickup built on the robust 350 chassis, pairing its truck-based durability with a four-speed automatic transmission and a powertrain calibrated to deliver a measured 15 mpg in the city and 22 mpg on the highway. With just 11 owner complaints logged for the model year, its reliability record remains notably sparse, though the electrical system emerged as the primary point of concern among those few issues. Those three official recalls underscore the importance of verifying service history, yet the low volume of reported problems suggests this iteration of the I occupies a relatively stable position in the nameplate’s later years—neither the most troubled nor entirely trouble-free, but a pragmatic choice for buyers prioritizing simplicity and proven mechanicals.

Model year2008 2007 2006

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Lug nut torque100 ft-lbsOEM · verified

EPA fuel economy15/22/17 mpgEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 86 · 640 CCA battery, OE oil filter 8890173420. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 86 · 640 CCAOEM · verified

Tire sizeP265-75R15OEM · verified

Wheel / rimN/A inOEM · verified

OE service part numbers OEM · verified

Engine oil filter	8890173420
Engine air filter	8152024080
Spark plug	8126816630
Front wiper blades	8889582240 alt 8889582220
Serpentine belt	8125937770 alt 8126116360
Thermostat	8125611550 alt 8126223160

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic 4-spd

Ratings & economy EPA / vPIC

EPA city / highway / combined	15 / 22 / 17 mpg
Drivetrain	Rear-Wheel Drive
Recommended fuel	Regular Gasoline

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine SYNTHETIC · 75W-90 in the differential, GM Part No. 12377967 brake fluid. Torque lug nuts to 100 ft-lbs, the oil drain plug to 19.0 ft-lbs. The firing order is 1-3-5-4-2.

Lubricants & capacities

Automatic Transmission Fluid	ATF
Automatic Transmission Fluid Capacity	5
Brake Fluid	GM Part No. 12377967
Differential Gear Oil	SYNTHETIC · 75W-90
Differential Gear Oil Capacity	3.5 Pints,
Engine Coolant	DEX-COOL OR EQUIVALENT
Power Steering Fluid	GM PART NO. 89021184 OR EQUIVALENT
Transfer Case Fluid	GM PART NO. 12345349 OR EQUIVALENT

Engine torques

Camshaft Bearing/Carrier Cap Bolts or Studs	9 ft-lbs
Intake Manifold to Engine Bolts	7.4 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	15 ft-lbs
Engine Oil Pan Drain Plug	19.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs	7 ft-lbs

Chassis torques

Leaf Spring to Axle (U-bolts)	56.0 ft-lbs
Leaf Spring to Rear Shackle	63.0 ft-lbs
Leaf Spring Rear Shackle to Chassis Bracket	63.0 ft-lbs
Lug Nuts	100 ft-lbs
Transfer Case Fill Plug	29.0 ft-lbs
Transfer Case Drain Plug	29.0 ft-lbs
Front Wheel Hub	191 ft-lbs

Ignition

Cylinder Firing Order	1-3-5-4-2
Cylinder Firing Order	1-3-5-4-2
Spark Plug Gap	0.040 in
Spark Plug Torque	13.0 ft-lbs

Battery & A/C

Refrigerant	R134a
Refrigerant Capacity	1.60 lbs
Oil Group	PAG
Oil Type	46
Oil Capacity	4.00 oz
Standard BCI Group Number	86
Standard BCI Cranking Performance	640 cca

Service checks

Pressure Test	15 psi
Radiator Cap Pressure Relief	15 psi
Thermostat Opening Temperature	194-225 °F
Key ON Engine OFF (KOEO)	50-57
Engine Compression	215
Engine Compression	145 psi
Engine Oil Pressure	12 psi
Engine Oil Pressure RPM	1200 rpm

Brakes

Torque Caliper to Bracket	29 ft-lbs
Torque to Knuckle	129 ft-lbs
Minimum Pad Thickness	0.070 in
Minimum Shoe Thickness	0.030 in
Rotor Max Parallel Variation	0.002 in
Rotor Runout Limit	0.002 in
Rotor Nominal Thickness From	1.062 in
Rotor Nominal Thickness To	1.062 in

Multi-step torque procedures OEM · verified

Leaf Spring to Chassis Bracket — tightening sequence 1 stages

Connecting Rod (Large End) Bearings — tightening sequence 1 stages

18 ft. lbs., Step 2: 110

18 ft. lbs

Engine Flywheel Bolts — tightening sequence 1 stages

30 ft. lbs., Step 2: 45

30 ft. lbs

Main Bearings — tightening sequence 1 stages

18 ft. lbs., Step 2: 180

18 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 100,000 mi; coolant at 150,000 mi. The big-interval services (at 150,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 25,000 mi	Exhaust System (Complete) (inspect) · Fuel System (inspect)
Every 50,000 mi	Engine Air Filter Element (replace)
Every 100,000 mi	Spark Plugs (replace)
At 150,000 mi	Accessory Drive Belt (inspect) · Engine Coolant System (drain, flush & refill)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

Owner complaints about the 2006 Isuzu I lead in one area — the electrical system, 2 of 11 reports (18%), well ahead of the next concern. None of this vehicle's 2 recall campaigns target the electrical system, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 0 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the electrical system pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.

Open recalls

NHTSA campaigns

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

0 involved a crash · 0 a fire

NHTSA crash-test rating federal NCAP · out of 5 stars

Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 11 complaints on record, top 8 components.

Electrical System2

Exterior Lighting,Unknown Or Other1

Fuel/Propulsion System1

Exterior Lighting1

Electrical System,Air Bags,Seat Belts1

Electrical System,Exterior Lighting,Unknown Or Other1

Service Brakes, Hydraulic,Exterior Lighting1

Engine & Engine Cooling1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 2 campaigns on record for this vehicle.

06V139000Exterior Lighting:Brake Lights:SwitchReported 27/04/2006

CERTAIN PICKUP TRUCKS MAY EXPERIENCE THE PERMANENT LOSS OF BRAKE LAMP FUNCTION OR BRAKE LAMPS THAT ARE ILLUMINATED AT ALL TIMES. THE CENTER HIGH-MOUNTED STOP LAMP (CHMSL) IS AFFECTED IN BOTH INSTANCES. ALSO, IF… Remedy: DEALERS WILL REPLACE THE BRAKE LAMP SWITCH ASSEMBLY. THE RECALL BEGAN ON DECEMBER 5, 2006. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438; GMC AT 1-866-996-9463 OR ISUZU AT…

09V310000Exterior Lighting:Brake Lights:SwitchReported 29/07/2009

GM IS RECALLING 185,903 MODEL YEAR 2004-2009 COLORADO, GMC MODEL YEAR 2009-2004 CANYON, MODEL YEAR 2006 I-280, I-350, MODEL YEAR 2007-2008 I-290, AND I-370, PASSENGER VEHICLES ORIGINALLY SOLD IN OR CURRENTLY REGISTERED… Remedy: DEALERS WILL INSPECT AND REPLACE THE NECESSARY COMPONENTS AS SPECIFIED IN THE RECALL BULLETIN FREE OF CHARGE. GM ANTICIPATES THAT PARTS WILL BE AVAILABLE BY JUNE 2010. A SPECIAL…

Technical service bulletins NHTSA · verified

Showing 5 of 42 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
IB13-R-001G	2023-05-08	Unknown Or Other	This bulletin outlines the procedures for using the Alpine Exchange Program (the…
WB13-X-001B	2022-08-30	Equipment	Isuzu Commercial Truck of America, Inc. (ICTA) is providing the following procedural…
WB13-X-001A	2022-08-02	Equipment	Isuzu Commercial Truck of America, Inc. (ICTA) is providing the following procedural…
IB09-X-002B	2022-07-20	Equipment	The following is a list of the Isuzu-recommended Threebond product part numbers…
IB09-X-004C	2022-07-20	Engine And Engine Cooling	The Isuzu Commercial Truck of America (ICTA) Service Technical Assistance Center (TAC)…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420

Catalyst system efficiency below threshold — Bank 1

P0300

Random / multiple cylinder misfire detected

P0171

System too lean — Bank 1

P0455

Evaporative emission system leak detected — large leak

P0128

Coolant thermostat below regulating temperature

P0442

Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN

Decode a VIN to confirm the transmission and build data for a specific I. OEM

Build data

Plant, GVWR class, engine and body data for any 17-character VIN.

Recalls

Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Group 86 battery 350-platform vehicles Engine oil filter 8890173420 Engine air filter 8152024080 Spark plug 8126816630 Front wiper blades 8889582240

Reference guides

Cross-vehicle references for the kinds of data on this page.

Vehicle recalls & TSBs OBD-II trouble codes Torque specifications Maintenance schedules Fluid capacities & specs

Frequently asked

Does the 2006 I have open recalls?

NHTSA lists 3 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the I get?

EPA figures are 15 city / 22 highway / 17 combined mpg.