GMC TruckSonoma 2WD2003Overview/gmc-truck/sonoma-2wd/2003/base/

2003 GMC Truck Sonoma 2WD

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

The 2003 GMC Sonoma 2WD is a two-wheel-drive pickup truck in GMC's Sonoma lineup, a model line defined by its straightforward mechanical layout. Service specifications for this model year call for a 4.5-quart oil capacity and 5W-30 API viscosity, reflecting the conventional maintenance profile of the vehicle. On the reliability side, the 2003 has logged 40 total owner complaints with the powertrain emerging as the top complaint area, paired with a single recall on record. For researchers building a reliability history of the nameplate, this profile positions the 2003 as a usable baseline — neither a standout problem year nor an exceptionally clean one — against which adjacent model years can be measured.

Model year200320001996

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 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 75 · 525 CCA battery, OE oil filter 12731175. 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 75 · 525 CCAOEM · verified
Tire sizeP235-55R16OEM · verified
Wheel / rim7-J inOEM · verified

OE service part numbers OEM · verified

Engine oil filter12731175 alt 19210286
Engine air filter25170512 alt 19259086
Fuel filter15077584 alt 25168594
Spark plug19238463 alt 12681665
Front wiper blades15757007 alt 15757008
Serpentine belt12576453 alt 19355374
Thermostat24577299 alt 12632948

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, 80W-90 · GL-5 in the differential, DOT 3 brake fluid. Torque lug nuts to 100 ft-lbs, the oil drain plug to 18.0 ft-lbs. The firing order is 1-6-5-4-3-2. 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

Brake FluidDOT 3
Differential Gear Oil80W-90 · GL-5
Differential Gear Oil Capacity3.6 qt
Engine Oil5W-30 · API
Engine Oil Capacity4.5 qt
Engine Oil5W-30 · API
Engine Oil Capacity5 qt

Engine torques

Crankshaft Pulley and/or Damper Bolts77 ft-lbs
Crankshaft Pulley and/or Damper Bolts70 ft-lbs
Cylinder Head StepsApply sealant GM P/N 12346004
Intake Manifold to Engine Bolts17.0 ft-lbs
Exhaust Manifold to Cylinder Head Bolts10.0 ft-lbs
Engine Oil Pan Drain Plug33.0 ft-lbs
Engine Oil Pan Drain Plug18.0 ft-lbs
Engine Valve Cover Bolts8.85 ft-lbs

Chassis torques

Leaf Spring to Axle (U-bolts)89.0 ft-lbs
Leaf Spring to Chassis Bracket89.0 ft-lbs
Leaf Spring to Rear Shackle89.0 ft-lbs
Leaf Spring Rear Shackle to Chassis Bracket89.0 ft-lbs
Lug Nuts100 ft-lbs
Front Wheel Hub103 ft-lbs

Ignition

Cylinder Firing Order1-6-5-4-3-2
Cylinder Firing Order1-3-4-2
Cylinder Firing Order1-6-5-4-3-2
Spark Plug ManufacturerAC Delco
Spark Plug Gap0.060 in
Spark Plug Torque11-14 ft-lbs
Spark Plug ManufacturerAC Delco
Spark Plug TypeAC 41-948

Battery & A/C

RefrigerantR134a
Refrigerant Capacity1.75 lbs
Oil GroupPAG
Oil Type46
Oil Capacity2.2 L
RefrigerantR134a
Refrigerant Capacity1.75-2.00 lbs
Oil GroupPAG

Service checks

Pressure Test15 psi
Radiator Cap Pressure Relief15 psi
Thermostat Opening Temperature188-206 °F
Fuel Pump Pressure Minimum62.0 psi
Key ON Engine OFF (KOEO)56-62
RPM46-59 @ Idle rpm
Fuel Pump Pressure Minimum62.0 psi
Key ON Engine OFF (KOEO)55-62

Brakes

Brake ApplicationWITH FOUR WHEEL DISC / WITH STANDARD
Torque to Knuckle77 ft-lbs / 52 ft-lbs / 38 ft-lbs
Minimum Pad ThicknessFront: 0.030; Rear: 0.030 specification
Brake ApplicationWITH FOUR WHEEL DISC / WITH STANDARD
Rotor Max Parallel Variation0.001 in
Rotor Runout Limit0.002 in
Rotor Nominal Thickness From1.14 in / 0.787 in / 1.03 in
Rotor Nominal Thickness To1.14 in / 0.787 in / 1.03 in

Multi-step torque procedures OEM · verified

Cylinder Head — tightening sequence 4 stages
1all bolts22 ft. lbs
2long bolts75 degrees
3medium bolts65 degrees
455
Cylinder Head — tightening sequence 1 stages
1short bolts43 ft. lbs
Exhaust Manifold to Cylinder Head Bolts — tightening sequence 1 stages
122.0

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 7,500 mi; 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.

At 7,500 miDrive Axle Assembly (drain & refill)
Every 7,500 miAxle Shaft Oil Seal (inspect) · CV Joint Boot (inspect) · Differential (inspect fluid level) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate)
At 15,000 miEngine Air Filter Element (inspect)
Every 30,000 miEngine Air Filter Element (replace) · Engine Air Filter Element (inspect) · Wheel Bearing (repack)
Every 50,000 miTransmission Fluid & Filter (replace)
Every 90,000 miFuel Filter (replace)
Every 100,000 miPCV Valve (inspect) · Spark Plug Wires (inspect) · Spark Plugs (replace)
At 150,000 miAccessory 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 Sonoma 2WD top in one area — the power train, 5 of 40 reports (12%), well ahead of the next concern. None of this vehicle's 1 recall campaigns target the power train, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 3 of the reports describe a crash and 1 a fire — a small share of the total, but worth weighing against the power train 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.

1
Open recalls
NHTSA campaigns
0
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
40
Owner complaints
3 involved a crash · 1 a fire

Owner complaints filed with NHTSA, by component

All 40 complaints on record, top 8 components.

Power Train5
Latches/Locks/Linkages4
Structure4
Seats3
Visibility3
Equipment3
Service Brakes, Hydraulic2
Fuel System, Gasoline2

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 1 of 1 campaigns on record for this vehicle.

04V132000Equipment:Other:LabelsReported 18/03/2004

CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 208, "OCCUPANT CRASH PROTECTION." Remedy: OWNERS WILL BE PROVIDED WITH CORRECT LABELS AND INSTALLATION INSTRUCTIONS. OWNER NOTIFICATION BEGAN ON JUNE 4, 2004. OWNERS SHOULD CONTACT CHEVROLET AT 1-800-630-2438 OR GMC AT…

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 Sonoma 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.

Reference guides

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

Frequently asked

How much oil does the 2003 Sonoma 2WD take?

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

Does the 2003 Sonoma 2WD have open recalls?

NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.