Ram B1500, B2500, B3500, 1999-2003

Powertrain Control Module



The Powertrain Control Module (PCM) performs many functions on your vehicle. The module accepts information from various engine sensors and computes the required fuel flow rate necessary to maintain the correct amount of air/fuel ratio and ignition timing throughout the entire engine operational range.

Based on the information that is received and programmed into the PCM's memory, the PCM generates output signals to control relays, actuators and solenoids. The PCM also sends out a command to the fuel injectors that meter the appropriate quantity of fuel. The module automatically senses and compensates for any changes in altitude when driving your vehicle.

Included among its many outputs, the PCM manages EVAP and other emissions components, ignition timing, alternator output, fuel injectors, electric fans (where fitted), cruise control, tachometer, fuel pump, and other systems.

Removal & Installation

The PCM is located on the right side of the engine compartment, either on the fender inner shield or on the firewall.

  1. Disconnect the battery negative cable(s).
  3. Remove the connector cover, if fitted.
  5. Disconnect the wiring from the PCM.
  7. Remove the mounting screws and take the unit out of the vehicle.
  9. Installation is the reverse of removal.

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Fig. Firewall-mounted PCM components and installation-typical

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Fig. Fender-mounted PCM installation-typical