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2005 Pontiac G6

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2005 G6.

Body PASSENGER CARTransmission Automatic (S4)

The 2005 Pontiac G6 enters the passenger car segment paired with a four-speed automatic transmission and EPA fuel economy ratings of 19 city, 26 highway, and 21 combined mpg. Yet, its baseline mechanical credentials are heavily weighed down by a problematic reliability record marked by 679 owner complaints predominantly focused on steering issues, alongside six separate recalls. Although it does not represent the absolute nadir of the model's 2003-2014 complaint history—a designation reserved for the 2006 model year with 1,909 complaints, compared to the 2003 low of just one—the 2005 still sits firmly within the G6's most troubled era, signaling substantial long-term ownership risks for researchers to note.

Model year2010 2009 2008 2007 2006 2005

Quick specs

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

Lug nut torque100 ft-lbsOEM · verified

EPA fuel economy19/26/21 mpgEPA · 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 sizeP215-60R16OEM · verified

OE service part numbers OEM · verified

Engine oil filter	12731175
Engine air filter	10366901
Spark plug	12681664
Battery	88861746 alt 88865311
Front wiper blades	15779416 alt 15779415
Serpentine belt	12591059
Thermostat	24507563 alt 10226107

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic (S4)

Dimensions & weight NHTSA vPIC

Overall length	189 in
Overall width	70.5 in
Overall height	57.1 in
Wheelbase	112.2 in
Curb weight	3380 lb
Track (front / rear)	60.2 / 60.6 in
Weight distribution (front / rear)	62/38

Ratings & economy EPA / vPIC

EPA city / highway / combined	19 / 26 / 21 mpg
Drivetrain	Front-Wheel Drive
Passenger volume	96 cu ft
Cargo volume	14 cu ft
Recommended fuel	Regular Gasoline

Service quick specs OEM factory data

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

This engine 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

Automatic Transmission Fluid	ATF
Automatic Transmission Fluid Capacity	7.4
Brake Fluid	DOT 3
Engine Coolant	DEX-COOL OR EQUIVALENT
Power Steering Fluid	ATF

Engine torques

Intake Manifold to Engine Bolts	Upper: 18 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	12 ft-lbs
Engine Oil Pan Drain Plug	18.0 ft-lbs
Engine Valve Cover Bolts	7.4 ft-lbs

Chassis torques

Lug Nuts	100 ft-lbs
Front Wheel Hub	159 ft-lbs

Ignition

Cylinder Firing Order	1-6-5-4-3-2
Spark Plug Manufacturer	AC Delco
Spark Plug Type	41-101
Spark Plug Gap	0.060 in
Spark Plug Torque	11.0 ft-lbs

Battery & A/C

Refrigerant	R134a
Refrigerant Capacity	1.10 lbs
Oil Group	PAG
Oil Type	46
Oil Capacity	5.00 oz
Standard BCI Group Number	75
Standard BCI Cranking Performance	525 cca

Service checks

Pressure Test	15, Pressure should not exceed 20 psi.
Radiator Cap Pressure Relief	15 psi
Thermostat Opening Temperature	185-205 °F
Injector Primary Resistance	11-14 @ 50-95 degreesF ohms
Engine Compression	100
Engine Compression	100 Minimum psi
Engine Oil Pressure	30-45 psi
Engine Oil Pressure RPM	1850 rpm

Brakes

Torque Caliper to Bracket	26 ft-lbs
Torque to Knuckle	85 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 Nominal Thickness From	1.023 in / 0.551 in
Rotor Nominal Thickness To	1.023 in / 0.551 in
Rotor Minimum Machining	0.906 in / 0.472 in

Multi-step torque procedures OEM · verified

Cylinder Head — tightening sequence 2 stages

1	44 ft. lbs.	44 ft. lbs
2	140 degrees	140 degrees

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 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.

The 2005 Pontiac G6 marks the first model year of this generation, and the federal record shows a dramatic spike from negligible pre-2005 complaints (1 in 2003, 2 in 2004) to 679 complaints, 6 recalls, and 4 investigations in its debut year. This places 2005 early in a complaint arc that peaks in 2006 (1,909 complaints, 7 recalls) and then gradually declines through 2010, suggesting the generation had significant teething issues. The top complaint area for 2005 is Steering (363 complaints), and the data also notes 26 crash-related and 4 fire-related complaints, though it does not specify root causes. With 570 TSBs—far fewer than later years like 2008 (1,019) or 2009 (1,046)—the service knowledge base was still developing, meaning fixes for common problems were less established. Given the high initial complaint and recall volume, the 2005 G6 is a poor choice for a used purchase; a later model year (e.g., 2008 or 2009) would offer lower complaint counts and more accumulated service information.

Open recalls

NHTSA campaigns

570

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

679

Owner complaints

26 involved a crash · 4 a fire

Owner complaints by model year NHTSA · this generation & adjacent

’03 ’04’05’06 ’07 ’08 ’09 ’10 ’14

Owner complaints filed with NHTSA, by component

All 679 complaints on record, top 8 components.

Steering363

Exterior Lighting33

Steering,Electrical System25

Power Train17

Fuel/Propulsion System17

Electrical System15

Service Brakes, Hydraulic13

Fuel System, Gasoline11

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 6 campaigns on record for this vehicle.

14V252000Electrical System:WiringReported 14/05/2014

General Motors LLC (GM) is recalling certain model year 2004-2012 Chevrolet Malibu vehicles manufactured May 16, 2003, through October 11, 2012, 2004-2007 Malibu Maxx vehicles manufactured June 25, 2003, through April… Remedy: GM will notify owners, and dealers will attach the wiring harness to the BCM with a spacer, apply dielectric lubricant to both the BCM and harness connector and the BAS and…

14V153000Steering:Electric Power Assist SystemReported 31/03/2014

General Motors LLC (GM) is recalling certain model year 2004-2006 and 2008-2009 Chevrolet Malibu, 2004-2006 Malibu Maxx, 2009-2010 HHR (non-turbo), 2010 Cobalt, 2008-2009 Saturn Aura and 2004-2007 Ion, and 2005-2009… Remedy: GM will notify owners, and dealers will perform one of four bulletins. Parts are not currently available. GM expects to send an interim notification around May 28, 2014. When…

Technical service bulletins NHTSA · verified

Showing 5 of 570 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…
PIT5074R	2025-05-30	Unknown Or Other	This Preliminary Information communication provides information to the technician about…
PIT5074R	2025-05-30	Unknown Or Other	This Preliminary Information communication provides information to the technician about…
PIT5074R	2025-05-30	Unknown Or Other	This Preliminary Information communication provides information to the technician about…
PIP5358D	2025-02-19	Unknown Or Other	This Preliminary Information communication provides information to the technician about…

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 G6. 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 75 battery Engine oil filter 12731175 Engine air filter 10366901 Spark plug 12681664 Battery 88861746

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 2005 G6 have open recalls?

NHTSA lists 6 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the G6 get?

EPA figures are 19 city / 26 highway / 21 combined mpg.