The electrical gun control system, supplied by ESW Extel Systems Wedel, comprises the automatic elevating and traversing drives with semi-automatic back-up, direct laying with electrical instrument control and manual control.

The 155 mm L52 gun of the PzH 2000 was developed by Rheinmetall Industrie AG. The barrel length is 52 calibres and chamber volume is 23 litres. The gun has a chromium-plated barrel and semiautomatic lifting breech block with integrated 32-round standard primer magazine. Gun parameters such as chamber temperature are monitored automatically. The PzH 2000 is equipped with a full automatic shell loading system with ammunition management system.

The chromium-plated barrel is 8 m long and is fitted with a slotted muzzle brake which gives increased muzzle velocity and reduces the level of muzzle flash. The wedge type breech block is integrated with an exchangeable primer magazine fitted with an endless conveyer for automatic primer transportation, loading and unloading.

Rheinmetall has also developed a six zone modular Propelling Charge System (MTLS) which is in compliance with the IBMOU. The MTLS provides for faster handling, less wear on the gun, lower sensitivity to ignition hazards and improved range. In the PzH2000, up to six MTLS modules form the propelling charge. The maximum range of the L52 gun using the maximum MTLS charges is 30 km with the standard L15A2 round and up to 40 km with assisted projectiles.

The gun positioning and laying system is produced by Honeywell Maintal and mounted on the gun cradle. The system automatically determines gun direction, position and elevation above sea level. The integrated Global Positioning System (GPS) receiver and the vehicle's motor sensors form the hybrid navigation system of the PzH 2000.

The PzH 2000 automatic shell loading system can handle 60 rounds of 155 mm ammunition. The shells are picked up from the back of the vehicle and automatically stowed in the 60-round magazine in the centre of the chassis.

The shell loading system is driven by brushless electric servo motors supplied by MOOG. The automatic shell loading system has pneumatically driven flick rammer and automatic digital control, ammunition supply management and inductive fuze setting. This provides rates of fire of 3 rounds in less than 10 seconds and loading of 60 shells by two operators within 12 minutes, including the collation of ammunition data. The firing rate of the PzH 2000 was 12 rounds in 59.74 seconds, and 20 rounds in 1 minute 47 seconds, during firing tests in October 1997 with an improved autoloader. The muzzle velocity is determined automatically by means of a radar sensor and is used in the fire control computation.

The PzH 2000 can use an automatic mode of operation including the data radio link with an external command and control system. The autonomous fire control functions are controlled by an on-board MICMOS computer supplied by EADS (formerly DaimlerChrysler Aerospace). Using the automatic mode, target engagements can be carried out by a crew of two. Using the fire control data provided by the ballistics computer, the gun is automatically laid and relayed during the mission.

Various backup modes are available which guarrantee system sustainability in case of a component failure. As the lowest backup mode, an optical mechanical backup sytem is available. The commander has a Leica PERI-RTNL 80 panoramic periscope, which is used in under-armour operations and for target designation in direct laying engagements. PERI-RTNL 80 has day and night vision channels and a laser rangefinder. The gunner is equipped with a Leica PzF TN 80 day and night direct fire sight for direct laying of the gun.

The 736 kW powerpack of the PzH 2000 is mounted at the front of the hull and consists of an 8-cylinder direct-injection, supercharged MTU MT881 Ka-500 diesel engine with a 4-speed Renk HSWL 284 C gearbox. Three fuel tanks provide a 420 km cruise range.