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2003 GMC Truck Yukon Denali

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Yukon Denali.

Body SUV

The 2003 GMC Yukon Denali is an SUV whose routine service baseline—6 quarts of 5W-30 API engine oil—hints at the mechanical scale beneath its Denali branding. Researchers should note, however, that this model year is defined less by those maintenance details than by its reliability record: 517 owner complaints are on file, with the Electrical System standing out as the top reported problem area. Those 8 recalls reinforce the pattern, making the 2003 Yukon Denali a model year to study chiefly for how electrical and recall issues figure into its long-term ownership story.

Quick specs

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

Engine oil capacity6 qtOEM · verified

Engine oil type5W-30 APIOEM · verified

Lug nut torque140 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 12731172. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known.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 sizeP265-70R16OEM · verified

Wheel / rim7.0 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter	12731172
Engine air filter	22845992 alt 15908916
Fuel filter	25171792 discontinued · alt 25164003
Spark plug	12621258
Front wiper blades	15214346
Serpentine belt	12576447 alt 12637202
Thermostat	12561155 alt 12571261

Service quick specs OEM factory data

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

This engine holds 6 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	SAE 75W · Synthetic
Differential Gear Oil Capacity	3.83 qt
Differential Gear Oil	SAE 75W · Synthetic
Differential Gear Oil	SAE 75W · Synthetic
Differential Gear Oil Capacity	1.83 qt
Engine Coolant	DEX-COOL OR EQUIVALENT
Engine Oil	5W-30 · API

Engine torques

Crankshaft Pulley and/or Damper Bolts	189 ft-lbs
Cylinder Head Steps	Install the NEW cylinder head bolts.
Cylinder Head Steps	Install the NEW cylinder head bolts.
Exhaust Manifold to Cylinder Head Bolts	Bolts: 26 ft-lbs, nuts: 12 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

Chassis torques

Leaf Spring to Chassis Bracket	110.0 ft-lbs
Leaf Spring to Rear Shackle	70.0 ft-lbs
Leaf Spring Rear Shackle to Chassis Bracket	70.0 ft-lbs
Lug Nuts	140 ft-lbs
Front Wheel Hub	177 ft-lbs

Ignition

Cylinder Firing Order	1-8-7-2-6-5-4-3
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	15 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
Oil Group	PAG
Standard BCI Group Number	78
Standard BCI Cranking Performance	600 cca
Optional BCI Group Number	78
Optional BCI Cranking Performance	770 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	62.0 psi
Key ON Engine OFF (KOEO)	55-62

Brakes

Brake Application	WITH RPO JC3, JC4, JH2 / WITH RPO JH6
Torque Caliper to Bracket	80 ft-lbs / 31 ft-lbs
Torque to Knuckle	129 ft-lbs / 122 ft-lbs
Brake Application	WITH RPO JC3, JC4, JH2 / WITH RPO JH6
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
Brake Application	WITH RPO JC3, JC4, JH2 / WITH RPO JH6

Multi-step torque procedures OEM · verified

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 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 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 6 stages

1	22 ft. lbs.	22 ft. lbs
2	22 ft. lbs.	22 ft. lbs
3	120 degrees	120 degrees
4	bolts 1, 2, 3, 6, 7, 8, 9, 10, 11, 14, 16, 17	60 degrees
5	bolts 15, 18	45 degrees
6	turn 30

Intake Manifold to Engine Bolts — tightening sequence 1 stages

3.7 ft. lbs., step 2: 5.9 ft. lbs., step 3: 8.8

3.7 ft. lbs

Intake Manifold to Engine Bolts — tightening sequence 1 stages

7.4

Exhaust Manifold to Cylinder Head Bolts — tightening sequence 1 stages

18.0

Intake Manifold to Engine Bolts — tightening sequence 1 stages

7.4

Exhaust Manifold to Cylinder Head Bolts — tightening sequence 1 stages

15.0

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) · Transmission Fluid & Filter (replace)
Every 60,000 mi	Fuel Evaporative Emission Control System (inspect)
Every 100,000 mi	PCV Valve (inspect) · 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.

Owner complaints about the 2003 GMC Truck Yukon Denali lead in one area — the electrical system, 121 of 517 reports (23%), well ahead of the next concern. None of this vehicle's 1 recall campaigns target the electrical system, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 29 of the reports describe a crash and 4 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

839

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

517

Owner complaints

29 involved a crash · 4 a fire

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

Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 517 complaints on record, top 8 components.

Electrical System121

Service Brakes81

Service Brakes, Hydraulic34

Engine & Engine Cooling21

Steering19

Tires15

Structure13

Visibility13

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 1 of 1 campaigns on record for this vehicle.

06E025000Exterior Lighting:HeadlightsReported 21/03/2006

CERTAIN POLI-AUTO COMBINATION HEADLAMP ASSEMBLIES, P/NOS. 11-728, 11-728D, 11-710, 11-419, 11-713, 11-703, 11-704, 11-708P, 11-735, 11-725, 11-726, 11-716 (P&C), 11-721-1, 11-733, 11-729, 11-730, AND 11-732, SOLD AS… Remedy: POLI-AUTO WILL NOTIFY OWNERS AND OFFER TO REPURCHASE THE HEADLAMPS AT ITS ORIGINAL PURCHASE PRICE. THE RECALL IS EXPECTED TO BEGIN DURING APRIL 2006. OWNERS MAY CONTACT POLI-AUTO…

Technical service bulletins NHTSA · verified

Showing 5 of 839 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
PIP5601C	2025-07-18	Unknown Or Other	This PI communicates the requirement to provide a pico file to receive diagnostic…
23-NA-001	2025-03-28	Electrical System	This service bulletin provides information for dealers/technicians on OnStar Module 2G…
03-06-01-023I	2024-12-17	Engine	This service bulletin explains how to measure for oil consumption and possible reasons…
PIP4723J	2024-10-25	Electrical System	This Preliminary Information communicates to the dealer the process for downloading or…
03-06-01-023H	2024-10-07	Engine	This service bulletin explains how to measure for oil consumption and possible reasons…