Description of DTC code P0070

The AAT (Ambient Air Temperature) Sensor turns the temperature of the ambient air into an electrical signal. The PCM (Powertrain Control Module) uses this signal to inspect the proper functioning of the air conditioning system. Also, the temperature of the outside air is reported.

The PCM also receives inputs from the Engine Coolant Temperature (ECT) Sensor and the Intake Air Temperature (IAT) Sensor, which it compares to the ATT Sensor after activating the power switch for the first time after an extended cooling period.

DTC code P0070 OBDII is set when these inputs have a lot of variation between them. It should be noted that these signals are also observed to check if they are right when the engine is completely warm.

Symptoms of fault code P0070

  • Check Engine light on.
  • The air conditioning is not working properly.
  • The erratic temperature reading on the instrument group.

Causes of OBD2 P0070

The reasons for storing the diagnostic code P0070 OBD2 are these:

  • An open in the signal circuit of the AAT Sensor.
  • AAT Sensor short circuit.
  • The AAT Sensor may be in poor condition.

Possible solutions of the DTC code P0070

The steps for solving the problems of the P0070 OBDII error code are the following:

  • See the Technical Service Bulletins (TSB).
  • Check the AAT Sensor electrical connectors and wiring. If you find any friction or wear on these components, they should be repaired or replaced. Also, check the terminals as they may be corroded.
  • With a DVOM (Digital Volt-Ohm Meter) test the AAT Sensor. Unplug the sensor and connect the red wire from the meter to one terminal of the sensor and the black wire to another terminal. If you get a 0 ohm reading the sensor is broken, you must replace it.

Codes related to P0070

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