| 5.1.2003 | Daytona Test | 61 | #WP0ZZZ99Z2S692088 | van Merksteijn / Brugman / Munsterhuis | System Force Motorsport | 25th |
| 5.1.2003 | Daytona Test | 68 | #WP0ZZZ99Z2S692062 | Michaelian / Valentine / Hessert / Hessert, III | The Racers Group | 26th |
| 5.1.2003 | Daytona Test | 99 | #WP0ZZZ99Z2S692102 | Greenberg / Nelson / Brensinger / Hamblin / Pobst | NETTTS Racing | 28th |
| 26.1.2003 | Mil Milhas Brasileiras | 9 | #WP0ZZZ99Z1S692082 | Hoffmann / Nabuco / Etchenique / Negrão | Pirelli/Medley | 1st |
| 2.2.2003 | 24 h Daytona | 43 | #WP0ZZZ99Z2S692065 | Baron / Hindery / Lieb / Petty | Orbit Racing | 6th |
| 2.2.2003 | 24 h Daytona | 44 | #WP0ZZZ99Z2S692066 | Fitzgerald / Matos / Policastro / Policastro, Jr. | Orbit Racing | 19th |
| 2.2.2003 | 24 h Daytona | 49 | #WP0ZZZ99Z1S692071 | Orlandi / Merendino / Clark / Atapattu | Pit Bull/MAC Racing | 17th |
| 2.2.2003 | 24 h Daytona | 57 | #WP0ZZZ99Z2S692067 | Caffi / Rosa / Chiesa / Rosa | Seikel Motorsport | 38th |
| 2.2.2003 | 24 h Daytona | 61 | #WP0ZZZ99Z2S692088 | van Merksteijn / Brugman / Munsterhuis / Jacobsen | System Force Motorsports | DNS |
| 2.2.2003 | 24 h Daytona | 66 | #WP0ZZZ99Z3S692061 | Buckler / Schrom / Bernhard / Bergmeister | The Racer's Group | 1st |
| 2.2.2003 | 24 h Daytona | 67 | #WP0ZZZ99Z2S692109 | Davis / Julien / Nastasi / Lacey | The Racer's Group | 35th |
| 2.2.2003 | 24 h Daytona | 68 | #WP0ZZZ99Z2S692062 | Michaelian / Valentine / Hessert, III / Hessert | The Racer's Group | 22nd |
| 2.2.2003 | 24 h Daytona | 98 | #WP0ZZZ99Z2S692100 | Maassen / Snow / Luhr / Schumacher | Schumacher Racing | 36th |
| 2.2.2003 | 24 h Daytona | 99 | #WP0ZZZ99Z2S692102 | Hamblin / Brensinger / Nelson / Greenberg | NETTTS Racing | 29th |
| 1.3.2003 | 250 mile Homestead | 43 | #WP0ZZZ99Z2S692065 | Baron / Hindery | Orbit Racing | DNA |
| 1.3.2003 | 250 mile Homestead | 44 | #WP0ZZZ99Z2S692066 | Policastro, Jr. / Policastro | Orbit Racing | DNA |
| 1.3.2003 | 250 mile Homestead | 66 | #WP0ZZZ99Z3S692061 | Buckler / Valentine | The Racers Group | 5th |
| 1.3.2003 | 250 mile Homestead | 67 | #WP0ZZZ99Z2S692109 | Lacey / Julien | The Racers Group | DNA |
| 1.3.2003 | 250 mile Homestead | 68 | #WP0ZZZ99Z2S692062 | Michaelian / Valentine | The Racers Group | DNA |
| 1.3.2003 | 250 mile Homestead | 84 | #WP0ZZZ99Z1S692067 | Mortimer / Hupfer | Acme Motorsport | DNS |
| 1.3.2003 | 250 mile Homestead | 98 | #WP0ZZZ99Z2S692100 | Schumacher / Snow | Schumacher Racing | DNA |
| 1.3.2003 | 250 mile Homestead | 99 | #WP0ZZZ99Z2S692102 | Nelson / Greenberg | NETTTS Racing | DNA |
| 7.3.2003 | FIA GT Test Barcelona | 56 | #WP0ZZZ99Z3S692070 | Dziurka / Dobrzanski | Alda Motorsport | 14th |
| 7.3.2003 | FIA GT Test Barcelona | - | #WP0ZZZ99Z1S692078 | Ortelli / Lieb | Freisinger Motorsport | 7th |
| 7.3.2003 | FIA GT Test Barcelona | - | #WP0ZZZ99Z2S692071 | Longin / Gardel | Freisinger Motorsport | 9th |
| 7.3.2003 | FIA GT Test Barcelona | - | #WP0ZZZ99Z1S692086 | Sumpter / Jordan | Team Eurotech | 12th |
| 15.3.2003 | 12 h Sebring | 03 | #WP0ZZZ99Z1S692068 | Foster / Nyberg / Skelton | Hyper Sport | 38th |
| 15.3.2003 | 12 h Sebring | 21 | #WP0ZZZ99Z1S692081 | Perrier / Barretto / Neugarten | Perspective Racing | DNA |
| 15.3.2003 | 12 h Sebring | 23 | #WP0ZZZ99Z3S692072 | Maassen / Luhr | Alex Job Racing | 10th |
| 15.3.2003 | 12 h Sebring | 24 | #WP0ZZZ99Z3S692071 | Bernhard / Bergmeister | Alex Job Racing | 17th |
| 15.3.2003 | 12 h Sebring | 31 | #WP0ZZZ99Z1S692062 | Mowlem / Jönsson / Stanton | White Lightning | 11th |
| 15.3.2003 | 12 h Sebring | 32 | | Jesús Diez de Villarroel | Ayrton Intermotor | DNA |
| 15.3.2003 | 12 h Sebring | 33 | #WP0ZZZ99Z2S692064 | Pumpelly / Lally / Ivankovich | ZIP Racing | 23rd |
| 15.3.2003 | 12 h Sebring | 39 | #WP0ZZZ99Z3S692062 | Assentato / Longhi / Sherman | ZIP Racing | DNS |
| 15.3.2003 | 12 h Sebring | 42 | #WP0ZZZ99Z3S692063 | Policastro / Policastro, Jr. / Fitzgerald | Orbit Racing | 22nd |
| 15.3.2003 | 12 h Sebring | 43 | #WP0ZZZ99Z2S692065 | Lieb / Baron | Orbit Racing | 51st |
| 15.3.2003 | 12 h Sebring | 52 | #WP0ZZZ99Z1S692079 | Collin / Lloyd / Shep | Seikel Motorsport | 29th |
| 15.3.2003 | 12 h Sebring | 53 | #WP0ZZZ99Z2S692067 | Caffi / Rosa / Chiesa | Seikel Motorsport | 14th |
| 15.3.2003 | 12 h Sebring | 66 | #WP0ZZZ99Z3S692061 | Buckler / Pace / Salazar | The Racer's Group | 21st |
| 15.3.2003 | 12 h Sebring | 67 | #WP0ZZZ99Z2S692109 | Schrom / Ehret / Rice | The Racer's Group | 24th |
| 15.3.2003 | 12 h Sebring | 68 | #WP0ZZZ99Z2S692062b | Wagner / Bunting / Gleason | The Racer's Group | 19th |
| 15.3.2003 | 12 h Sebring | 79 | #WP0ZZZ99Z2S692063 | Murry / Cunningham | J-3 Racing | 46th |
| 30.3.2003 | GT Aida | 26 | | Yamaji / Nishizawa | Team Taisan Advan | 15th |
| 30.3.2003 | Italian GT Imola | 53 | | Valli / Wolff | Autorlando Sport | 4th/5th |
| 30.3.2003 | Italian GT Imola | 54 | #WP0ZZZ99Z2S692097? | Meddi / de Micheli | Autorlando Sport | 16th/12th |
| 30.3.2003 | Italian GT Imola | 55 | | Bianchini / Medici | Newman Motorsport | 17th/13th |
| 30.3.2003 | Italian GT Imola | 56 | | Drudi / Gabellini | Newman Motorsport | 6th/4th |
| 30.3.2003 | Italian GT Imola | 62 | | Riccitelli / Busnelli | Ebimotors | 1st/2nd |
| 30.3.2003 | Italian GT Imola | 63 | | Pichler / Sangiuolo | Mac Racing | 10th/15th |
| 6.4.2003 | 500 km Barcelona | 50 | #WP0ZZZ99Z3S692073 | Lieb / Maassen | Freisinger Motorsport | DNF |
| 6.4.2003 | 500 km Barcelona | 51 | #WP0ZZZ99Z2S692071 | Gardel / Longin | Freisinger Motorsport | DNF |
| 6.4.2003 | 500 km Barcelona | 56 | #WP0ZZZ99Z3S692070 | Dziurka / Dobrzanski | Alda Motorsport | 21st |
| 6.4.2003 | 500 km Barcelona | 63 | #WP0ZZZ99Z3S692075 | Gutiérrez / Villalba | Motor Competicion | 24th |
| 6.4.2003 | 500 km Barcelona | 64 | #WP0ZZZ99Z1S692090 | Premoli / Barbaro / De Castro | AB Motorsport | 22nd |
| 6.4.2003 | 500 km Barcelona | 74 | #WP0ZZZ99Z1S692086 | Sumpter / Jordan | Team Eurotech | 18th |
| 6.4.2003 | 500 km Barcelona | 77 | #WP0ZZZ99Z1S692088 | Vasiliev / Fomenko | RWS Yukos Motorsport | 16th |
| 13.4.2003 | Belcar Zolder NRF | 31 | #WP0ZZZ99Z2S692073 | Dujardyn / Goossens | RTM Racing | DNF |
| 13.4.2003 | Belcar Zolder NRF | 34 | | Menten / van Hooydonk | AD Sport | DNF |
| 13.4.2003 | Belcar Zolder NRF | 36 | | Thiers / Thiers | Russell Racing | 5th |
| 13.4.2003 | Belcar Zolder NRF | 40 | #WP0ZZZ99Z3S692068 | Lefort / Lambert | Ice Pol Racing Team | DNF |
| 13.4.2003 | Italian GT Mugello | 53 | | Valli / Wolff | Autorlando Sport | 17th/8th |
| 13.4.2003 | Italian GT Mugello | 54 | #WP0ZZZ99Z2S692097? | Meddi / Blancardi | Autorlando Sport | 10th/DNF |
| 13.4.2003 | Italian GT Mugello | 55 | | Bianchini / Medici | Newman Motorsport | 11th/7th |
| 13.4.2003 | Italian GT Mugello | 56 | | Drudi / Gabellini | Newman Motorsport | 3rd/4th |
| 13.4.2003 | Italian GT Mugello | 62 | | Riccitelli / Busnelli | Ebimotors | 2nd/DNF |
| 21.4.2003 | FFSA GT Nogaro | 25 | | Ruffier / Miloé | Ruffier Racing | 13th/12th |
| 21.4.2003 | FFSA GT Nogaro | 26 | | Miloé / Hugot | Ruffier Racing | 33rd/34th |
| 21.4.2003 | FFSA GT Nogaro | 29 | | Bornhauser / Thévenin | V B M | 11th/13th |
| 21.4.2003 | FFSA GT Nogaro | 30 | | Brocard / Desbruères | Kalliste | - |
| 21.4.2003 | FFSA GT Nogaro | 36 | | Marques / Roux | Scorp Motorsport | 17th/16th |
| 27.4.2003 | Spanish GT Albacete | 9 | | Caternet / Maury-Laribiére | Noel Del Bello Racing | 11th/12th |
| 27.4.2003 | Spanish GT Albacete | 10 | | Villalba Ruiz / Gutiérrez | Motor Competicion | 3rd/9th |
| 27.4.2003 | Spanish GT Albacete | 12 | | Pais Do Amaral / Couceiro | ASM Team Beta | 4th/3rd |
| 27.4.2003 | Belcar Zolder WSN | 31 | #WP0ZZZ99Z2S692073 | Penders / Goossens | RTM Racing | DNF |
| 27.4.2003 | Belcar Zolder WSN | 34 | | Menten / Maes | AD Sport | DNF |
| 27.4.2003 | Belcar Zolder WSN | 36 | | Thiers / Thiers | Russell Racing | 6th |
| 27.4.2003 | Belcar Zolder WSN | 40 | #WP0ZZZ99Z3S692068 | Lefort / Lambert | Ice Pol Racing Team | 23rd |
| 27.4.2003 | 500 km Magny-Cours | 50 | #WP0ZZZ99Z3S692073 | Lieb / Ortelli | Freisinger Motorsport | 7th |
| 27.4.2003 | 500 km Magny-Cours | 51 | #WP0ZZZ99Z2S692071 | Longin / Gardel | Freisinger Motorsport | 10th |
| 27.4.2003 | 500 km Magny-Cours | 56 | #WP0ZZZ99Z3S692070 | Dziurka / Dobrzanski | Alda Motorsport | 17th |
| 27.4.2003 | 500 km Magny-Cours | 64 | #WP0ZZZ99Z1S692090 | Premoli / De Castro / Barbaro | AB Motorsport | DNF |
| 27.4.2003 | 500 km Magny-Cours | 65 | #WP0ZZZ99Z2S692069 | Campbell / Desbruères | Protonic Desbrueres | 20th |
| 27.4.2003 | 500 km Magny-Cours | 74 | #WP0ZZZ99Z1S692086 | Jordan / Sumpter | Team Eurotech | 13th |
| 27.4.2003 | 500 km Magny-Cours | 77 | #WP0ZZZ99Z1S692088 | Vasiliev / Fomenko | RWS Yukos Motorsport | 16th |
| 3.5.2003 | 250 mile Phoenix | 67 | | Lacey / Julien | The Racer's Group | DNA |
| 3.5.2003 | 250 mile Phoenix | 84 | #WP0ZZZ99Z1S692067 | Mortimer / Hupfer | Acme Motorsports | DNA |
| 3.5.2003 | 250 mile Phoenix | 99 | #WP0ZZZ99Z2S692102 | Greenberg / Nelson | NETTTS Racing | DNA |
| 4.5.2003 | SM GTR Falkenberg | 1 | | Nyström / Gustavsson | Podium Racing | 1st/1st |
| 4.5.2003 | SM GTR Falkenberg | 6 | #WP0ZZZ99Z1S692102 | Bernard Löhr | Team Löhr Racing | NC/3rd |
| 4.5.2003 | 500 km Fuji | 26 | | Yamaji / Nishizawa | Team Taisan Advan | 12th |
| 4.5.2003 | Euro GT Nürburgring | 51 | | Charles Brugman | Team Lammertink | 6th/7th |
| 4.5.2003 | Le Mans Test | 74 | #WP0ZZZ99Z2S692085 | Franchitti / Ruffier / Thévenin | Luc Alphand Aventures | 50th |
| 4.5.2003 | Le Mans Test | 75 | #WP0ZZZ99Z1S692081 | Khan / Neugarten / Smith | Thierry Perrier | 42nd |
| 4.5.2003 | Le Mans Test | 77 | #WP0ZZZ99Z2S692068 | Atsushi Yogo | Team Taisan Advan | 47th |
| 4.5.2003 | Le Mans Test | 81 | #WP0ZZZ99Z3S692076 | Buckler / Bergmeister / Bernhard | The Racers Group/Kevin A. Buckler | 34th |
| 4.5.2003 | Le Mans Test | 82 | #WP0ZZZ99Z2S692109 | Daniels / Ehret / Gröbl | The Racers Group/Kevin A. Buckler | 52nd |
| 4.5.2003 | Le Mans Test | 83 | #WP0ZZZ99Z1S692079 | Shep / Burgess / Lloyd | Seikel Motorsport | 44th |
| 4.5.2003 | Le Mans Test | 84 | #WP0ZZZ99Z1S692070 | Ickx / Bourdais / Bervillé | T2M-Motorsport | 49th |
| 4.5.2003 | Le Mans Test | 87 | #WP0ZZZ99Z3S692065 | Hindery / Baron / Lieb | Orbit | 38th |
| 4.5.2003 | Le Mans Test | 93 | #WP0ZZZ99Z32692079 | Maassen / Collard / Luhr / Petersen | Alex Job Racing | 37th |