THE Voyager uses a powertrain control module (PCM), SBEC III, which keeps an eye on critical components like the engine and takes action if the status quo changes. The PCM will activate engine cooling fans if the coolant temperature and/or air-conditioning system head pressure are likely to exceed their target.

A transmission control module (TCM) alters shift characteristics based on engine and transmission temperature. During warm-up or when overheating, the TCM will alter the shifts to maintain smooth operation. The PCM and TCM work together to ensure the cruise control system is always in the right gear. If the set speed is exceeded by more than 5km/h and the throttle is closed, the TCM causes the transmission to downshift to third gear. Computer logic is used to reduce the number and frequency of downshifts when the cruise control is set. Computer technology also prevents the starter from operating if the engine is already running, eliminating damage to the starter - not to mention driver embarrassment.