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2003 Chevrolet Express 2WD

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

Body VANTransmission Automatic 4-spd

The 2003 Chevrolet Express 2WD is a van built with a four-speed automatic transmission, and its reference profile centers on a precise set of efficiency and maintenance figures. EPA estimates come in at 15/21/17 mpg, while the oil system is specified at exactly 4.5 quarts of 5W-30 API viscosity. With its documented record resting on these concrete operational specifications, this model year serves as a fixed baseline for researchers comparing data across the Express line.

Quick specs

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

Engine oil capacity4.5 qtOEM · verified

Engine oil type5W-30 APIOEM · verified

Lug nut torque140 ft-lbsOEM · verified

EPA fuel economy15/21/17 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 78 · 600 CCA battery, OE oil filter 12731175. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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

OE service part numbers OEM · verified

Engine oil filter	12731175 alt 25322835
Engine air filter	22909882
Fuel filter	25171792 discontinued
Spark plug	12681665 alt 12621258
Front wiper blades	15214346
Serpentine belt	12576447 alt 12576453
Thermostat	12632948 alt 12551507

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic 4-spd

Dimensions & weight NHTSA vPIC

Overall length	224 in
Overall width	79.5 in
Overall height	81.5 in
Wheelbase	135 in
Curb weight	5218 lb
Track (front / rear)	68.1 / 67.7 in

Ratings & economy EPA / vPIC

EPA city / highway / combined	15 / 21 / 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 holds 4.5 qt of 5W-30 API engine oil, SAE 75W · SYNTHETIC in the differential, DOT 3 brake fluid. Torque lug nuts to 140 ft-lbs, the oil drain plug to 18.0 ft-lbs. The firing order is 1-8-7-2-6-5-4-3. 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

Brake Fluid	DOT 3
Differential Gear Oil	80W-90 · GL-5
Differential Gear Oil Capacity	6.6 qt
Differential Gear Oil	80W-90 · GL-5
Differential Gear Oil Capacity	5.5 qt
Differential Gear Oil	SAE 75W · SYNTHETIC
Differential Gear Oil Capacity	4.4 qt
Engine Coolant	DEX-COOL OR EQUIVALENT

Engine torques

Crankshaft Pulley and/or Damper Bolts	70 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Valve Cover Bolts	9.0 ft-lbs

Chassis torques

Leaf Spring to Axle (U-bolts)	103.0 ft-lbs
Leaf Spring to Chassis Bracket	107.0 ft-lbs
Leaf Spring to Rear Shackle	66.0 ft-lbs
Leaf Spring Rear Shackle to Chassis Bracket	66.0 ft-lbs
Lug Nuts	140 ft-lbs
Transfer Case Fill Plug	18.0 ft-lbs
Transfer Case Drain Plug	18.0 ft-lbs
Front Wheel Hub	155 ft-lbs

Ignition

Cylinder Firing Order	1-6-5-4-3-2
Cylinder Firing Order	1-8-7-2-6-5-4-3
Spark Plug Manufacturer	AC Delco
Spark Plug Gap	0.060 in
Spark Plug Torque	11-14 ft-lbs
Spark Plug Manufacturer	AC Delco
Spark Plug Gap	0.060 in
Spark Plug Torque	11.0 ft-lbs

Battery & A/C

Refrigerant	R134a
Refrigerant Capacity	2.00 lbs
Oil Group	PAG
Oil Type	46
Oil Capacity	8.00 oz
Standard BCI Group Number	78
Standard BCI Cranking Performance	600 cca
Standard BCI Group Number	78

Service checks

Pressure Test	15 psi
Radiator Cap Pressure Relief	15 psi
Thermostat Opening Temperature	188-206 °F
Fuel Pump Pressure Minimum	62.0 psi
Key ON Engine OFF (KOEO)	55-62
RPM	45-59 @ Idle rpm
Fuel Pump Pressure Minimum	62.0 psi
Key ON Engine OFF (KOEO)	55-62

Brakes

Torque Caliper to Bracket	80 ft-lbs / 31 ft-lbs
Torque to Knuckle	129 ft-lbs / 122 ft-lbs
Minimum Pad Thickness	Front: 0.030; Rear: 0.030 specification
Rotor Max Parallel Variation	0.001 in
Rotor Runout Limit	0.002 in
Rotor Minimum Machining	1.102 in
Rotor Discard at or Under	1.083 in

Multi-step torque procedures OEM · verified

Cylinder Head — tightening sequence 4 stages

Prep M11 Bolts 1-10

1	22.0 ft. lbs.	22 ft. lbs
2	90 degrees	90 degrees
3	bolts 1-8 90 degrees	90 degrees
4	bolts 9and10 50 degrees; M8 Bolts	50 degrees
1	22 ft. lbs.	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 15,000 mi	Underbody Splash Shield (inspect)
Every 30,000 mi	Fuel Filter (replace) · Wheel Bearing (repack)
Every 50,000 mi	Transmission Fluid & Filter (replace)
Every 60,000 mi	Fuel Evaporative Emission Control System (inspect)
Every 100,000 mi	Spark Plug Wires (inspect) · 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.

Open recalls

NHTSA campaigns

601

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

127

Owner complaints

0 involved a crash · 0 a fire

No owner complaints on record with NHTSA for this vehicle.

Recalls NHTSA · verified

No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.

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 Express 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 4.5 qt Engine oil filter 12731175 Engine air filter 22909882 Fuel filter 25171792 Spark plug 12681665

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 Express 2WD take?

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

Does the 2003 Express 2WD have open recalls?

NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the Express 2WD get?

EPA figures are 15 city / 21 highway / 17 combined mpg.