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2003 GMC Truck Envoy 2WD

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Envoy 2WD.

The 2003 GMC Envoy 2WD specifies a 7-quart fill of 5W-30 API oil and carries a distinctive reliability profile: it logged 640 owner complaints — the peak across the 1995–2009 model run — with the gasoline fuel system ranking as the leading complaint category and eight recalls issued. That total dwarfs the 1995 model’s single complaint, anchoring the 2003 as the most complaint-heavy year in the nameplate’s history. For a researcher, the concentration of fuel-system reports and recall activity marks this model year as one demanding thorough verification of recall completion and service history before acquisition.

Model year2008 2005 2003

Quick specs

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

Engine oil capacity7 qtOEM · verified

Engine oil type5W-30 APIOEM · verified

Lug nut torque100 ft-lbsOEM · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 78 · 600 CCA battery, OE oil filter 12731179. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known. 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 78 · 600 CCAOEM · verified

Tire sizeENVOY, TRAILBLAZER LS 4WD P245-70R16;BLAZER P235-75R15OEM · verified

Wheel / rim7-J, 7-J, 7-J inOEM · verified

OE service part numbers OEM · verified

Engine oil filter	12731179
Engine air filter	19239713
Fuel filter	19368932 discontinued
Spark plug	12681663
Battery	88866121 alt 88866305
Front wiper blades	15214346
Serpentine belt	12593774
Thermostat	12561155 alt 12620112

Service quick specs OEM factory data

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

This engine holds 7 qt of 5W-30 API engine oil, 75W-90 · GL-5 in the differential. Torque lug nuts to 100 ft-lbs, the oil drain plug to 19.0 ft-lbs. The firing order is 1-8-4-3-6-5-7-2. Note the cylinder-head bolts finish on a torque angle (torque-to-yield) — they stretch permanently and should be replaced, not reused, during any head service.

Lubricants & capacities

Differential Gear Oil	75W-90 · GL-5
Differential Gear Oil Capacity	4.0 qt
Engine Oil	5W-30 · API
Engine Oil Capacity	7 qt

Engine torques

Intake Manifold to Engine Bolts	7.4 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	15 ft-lbs
Intake Manifold to Engine Bolts	7.4 ft-lbs
Intake Manifold to Engine Bolts	7.4 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Oil Pan Drain Plug	19.0 ft-lbs
Engine Valve Cover Bolts	9.0 ft-lbs

Chassis torques

Lug Nuts	100 ft-lbs
Front Wheel Hub	103 ft-lbs

Ignition

Cylinder Firing Order	1-5-3-6-2-4
Cylinder Firing Order	1-5-3-6-2-4
Cylinder Firing Order	1-8-4-3-6-5-7-2
Spark Plug Manufacturer	AC Delco
Spark Plug Type	AC 41-981
Spark Plug Gap	0.050 in
Spark Plug Torque	13.0 ft-lbs
Spark Plug Manufacturer	AC Delco

Battery & A/C

Refrigerant	R134a
Oil Group	PAG
Oil Type	46
Standard BCI Group Number	78
Standard BCI Cranking Performance	600 cca
Standard BCI Group Number	78
Standard BCI Cranking Performance	600 cca

Service checks

Pressure Test	15 psi
Radiator Cap Pressure Relief	15 psi
Thermostat Opening Temperature	188-206 °F
Pressure Test	15 psi
Radiator Cap Pressure Relief	15 psi
Thermostat Opening Temperature	188-206 °F
Fuel Pump Pressure Minimum	50.0 psi
Fuel Pump Pressure Maximum	57.0 psi

Brakes

Brake Application	WITH FOUR WHEEL DISC / WITH STANDARD
Torque to Knuckle	77 ft-lbs / 52 ft-lbs / 38 ft-lbs
Minimum Pad Thickness	Front: 0.030; Rear: 0.030 specification
Brake Application	WITH FOUR WHEEL DISC / WITH STANDARD
Rotor Max Parallel Variation	0.001 in
Rotor Runout Limit	0.002 in
Rotor Nominal Thickness From	1.14 in / 0.787 in / 1.03 in
Rotor Nominal Thickness To	1.14 in / 0.787 in / 1.03 in

Multi-step torque procedures OEM · verified

Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages

110 ft. lbs., step 2: 180

110 ft. lbs

Cylinder Head — tightening sequence 2 stages

Prep bolts 1-14:

1	22 ft. lbs.	22 ft. lbs
2	155 degrees; bolt 15:	155 degrees
1	62 in. lbs.	62 in
2	120 degrees; bolts 16-17:	120 degrees
1	62 in. lbs.	62 in
2	60

Cylinder Head — tightening sequence 5 stages

1	M11 bolts	22 ft. lbs
2	M11 bolts-90 degrees	90 degrees
3	M11 bolts 1-8	90 degrees
4	M11 bolts 9 and 10	50 degrees
5	22

Cylinder Head — tightening sequence 1 stages

M11 bolts

22 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 7,500 mi	Axle Shaft Oil Seal (inspect) · CV Joint Boot (inspect) · Differential (inspect fluid level) · Tire & Wheel Assembly (rotate)
Every 30,000 mi	Engine Air Filter Element (replace) · Fuel Filter (replace)
Every 50,000 mi	Transfer Case Assembly (drain & refill)
Every 100,000 mi	PCV Valve (inspect) · Spark Plug Wires (inspect) · Spark Plugs (replace) · Transmission Fluid & Filter (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 2003 GMC Truck Envoy 2WD top in one area — the fuel system, gasoline, 100 of 640 reports (16%), well ahead of the next concern. None of this vehicle's 8 recall campaigns target the fuel system, gasoline, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 54 of the reports describe a crash and 11 a fire — a small share of the total, but worth weighing against the fuel system, gasoline 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

640

Owner complaints

54 involved a crash · 11 a fire

Owner complaints by model year NHTSA · this generation & adjacent

’95 ’96 ’97 ’98 ’99 ’00 ’01 ’02’03’04 ’05 ’06 ’07 ’08 ’09

Owner complaints filed with NHTSA, by component

All 640 complaints on record, top 8 components.

Fuel System, Gasoline100

Electrical System85

Power Train42

Visibility40

Structure34

Fuel/Propulsion System32

Air Bags30

Exterior Lighting26

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 8 campaigns on record for this vehicle.

07E014000Exterior Lighting:HeadlightsReported 26/02/2007

CERTAIN MAXZONE HEADLIGHT ASSEMBLIES, DEPO BRAND, P/NO 335-1120L-AS, SOLD FOR USE AS AFTERMARKET EQUIPMENT FOR THE ABOVE LISTED PASSENGER VEHICLES. DURING PRODUCTION THE LAMP HOUSING SHAPE DEFORMED DISTORTING THE… Remedy: MAXZONE WILL NOTIFY OWNERS AND OFFER REIMBURSEMENT FOR ANY NONCOMPLIANT HEADLIGHTS. THE RECALL BEGAN ON FEBRUARY 16, 2007. OWNERS MAY CONTACT MAXZONE AT 909-822-3288.

05V198000Exterior Lighting:Turn SignalReported 05/05/2005

ON CERTAIN TRUCKS AND SPORT UTILITY VEHICLES, THE DRIVER WISHING TO SIGNAL A TURN BY MOVING THE DIRECTIONAL SIGNAL LEVER, (UP OR DOWN) MAY CAUSE THE FRONT MARKER/TURN LIGHTS AND REAR TURN LIGHTS TO FLASH IN A MANNER… Remedy: DEALERS WILL REPLACE THE SUSPECT FLASHER MODULES WITH A NEW FLASHER MODULE DESIGNED WITH SEALED RELAYS AND MORE DURABLE CONTACT MATERIAL INSIDE OF THE RELAYS FREE OF CHARGE. THE…

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 Envoy 2WD. 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 78 battery Vehicles taking 7 qt Engine oil filter 12731179 Engine air filter 19239713 Fuel filter 19368932 Spark plug 12681663

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

How much oil does the 2003 Envoy 2WD take?

7 qt of 5W-30 API, per the factory manual.

Does the 2003 Envoy 2WD have open recalls?

NHTSA lists 8 recall campaign(s) for this model year. Check your specific vehicle by VIN.