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OBD II Fault Code

  • OBD II P258B

OBD-II Code Climate control systems will not work is defined as a Vacuum Pump Control Range/Performance

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 code P258B.

Climate control systems will not work Symptoms

  • Climate control systems will not work

Common Problems That Trigger the P258B Code

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

Common Repairs Needed for the P258B Code

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