OBD II Fault Code

  • OBD II P0074

OBD-II Code Hard engine start is defined as a Ambient Air Temperature Sensor Circuit Intermittent

The ambient temperature sensor helps the engine control module (PCM) determine how much fuel to use on startup. The PCM also uses this signal as a logic reference for other temperature sensors on the engine. If the PCM detects an issue with the signal from this sensor, it will set code P0074.

Hard engine start Symptoms

  • Hard engine start

Common Problems That Trigger the P0074 Code

  • Ambient air temperature sensor failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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