The Astra-H GTC has an attractive range of six petrol engines and four diesel power units with a wide range of power outputs.
| Engine | | Z 14 XEL | Z 14 XEP | Z 16 XEP | Z 18 XE |
| Type | | DOHC | DOHC | DOHC | DOHC |
| Power output | kW | 55 | 66 | 77 | 92 |
| rpm | 5200 | 5600 | 6000 | 5600 |
| Torque | Nm | 120 | 125 | 150 | 170 |
| rpm | 3800 | 4000 | 3900 | 3800 |
| Displacement | cm 3 | 1364 | 1364 | 1598 | 1796 |
| Bore diameter | mm | 73.4 | 73.4 | 79.0 | 80.5 |
| Stroke | mm | 80.6 | 80.6 | 81.5 | 88.2 |
| Compression ratio | | 10.5:1 | 10.5:1 | 10.5:1 | 10.5:1 |
| Valves | per cylinder | 4 | 4 | 4 | 4 |
| Camshaft | Number | 2 | 2 | 2 | 2 |
| Engine management system | | Motronic ME 7.6.1 | Motronic ME 7.6.1 | MT 35 E | Simtec MS 71 |
| Emissions regulations in accordance with | | EURO 4 | EURO 4 | EURO 4 | EURO 4 |
| Transmission | MT | F13-5 CR | F13-5 CR | F17-5 CR / WR MTA | F17-5 CR |
| AT | - | - | - | AF17-4 |
| Engine | | Z 20 LEL | Z 20 LER | Z 13 DTH | Z 17 DTH |
| Type | | DOHC | DOHC | DOHC | DOHC |
| Power output | kW | 125 | 147 | 66 | 74 |
| rpm | 5200 | 5400 | 4000 | 4400 |
| Torque | Nm | 250 | 262 | 200 | 240 |
| rpm | 1950 | 4200 | 1750 - 2500 | 2300 |
| Displacement | cm 3 | 1998 | 1998 | 1248 | 1686 |
| Bore diameter | mm | 86.0 | 86.0 | 69.6 | 79.0 |
| Stroke | mm | 86.0 | 86.0 | 82.0 | 86.0 |
| Compression ratio | | 8.8:1 | 8.8:1 | 17.6:1 | 18.4:1 |
| Valves | per cylinder | 4 | 4 | 4 | 4 |
| Camshaft | Number | 2 | 2 | 2 | 2 |
| Engine management system | | Motronic ME 7.6.2 | Motronic ME 7.6.2 | MM 6 O 2 | Bosch EDC 16 C 9 |
| Emissions regulations in accordance with | | EURO 4 | EURO 4 | EURO 4 | EURO 4 |
| Transmission | MT | M32-6 WR | M32-6 WR | M20-6 | F32-5 WR M32-6 WR |
| AT | - | - | - | - |
| Engine | | Z 19 DTJ | Z 19 DTH |
| Type | | DOHC | DOHC |
| Power output | kW | 88 | 110 |
| rpm | 3250 | 4000 |
| Torque | Nm | 280 | 320 |
| rpm | 1750 - 2750 | 2000 - 2750 |
| Displacement | cm 3 | 1910 | 1910 |
| Bore diameter | mm | 82 | 82 |
| Stroke | mm | 90.4 | 90.4 |
| Compression ratio | | 17.5:1 | 17.5:1 |
| Valves | per cylinder | 4 | 4 |
| Camshaft | Number | 2 | 2 |
| Engine management system | | Bosch EDC 16 C 9 | Bosch EDC 16 C 9 |
| Emissions regulations in accordance with | | EURO 4 | EURO 4 |
| Transmission | MT | M32-6 WR | M32-6 WR |
| AT | - | - |