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OBD II Fault Code

  • OBD II P258C

OBD-II Code Climate control systems will not work is defined as a Vacuum Pump Control Circuit Low

Diesel vehicles have a separate vacuum pump an reservoir because they cannot utilize vacuum from the engine the way a gasoline vehicles can. The engine control module (PCM) tells the vacuum pump when to turn on an off. If the PCM cannot control the pump, it will set P258C.

Climate control systems will not work Symptoms

  • Climate control systems will not work

Common Problems That Trigger the P258C Code

  • Powertrain Control Module (PCM) failure
  • Vacuum pump failure
  • Vacuum pump relay failure
  • Wiring issue

Common Repairs Needed for the P258C Code

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