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OBD II Fault Code

  • OBD II P0599

OBD-II Code Cooling fans may stay on all the time is defined as a Thermostat Heater Control Circuit High

Some newer engines utilize thermostats that are electronically controlled by the engine control module (PCM). If the PCM detects an incorrect signal from thermostat, the PCM will set code P0599.

Cooling fans may stay on all the time Symptoms

  • Cooling fans may stay on all the time

Common Problems That Trigger the P0599 Code

  • Powertrain Control Module (PCM) failure
  • Thermostat failure
  • Wiring issue

Common Repairs Needed for the P0599 Code

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