What this code means
P0073 may indicate that the PCM is seeing the ambient air temperature sensor circuit as high.
What the vehicle may do
- The check engine light may be on.
- The outside temperature display can be inaccurate.
- Climate-control operation may seem unusual on some vehicles.
Possible fault areas
- Ambient air temperature sensor circuit concerns are possible.
- Connector or wiring issues can be involved.
- The sensor or PCM input side may be involved.
Diagnostic path
Opening context
On this 2015 to 2025 Ford F-150 with the 3.5 EcoBoost, P0073 points to the ambient air temperature sensor circuit reading high. In plain language, the PCM may be seeing an outside-air temperature signal that does not make sense on the high side. The truck may have a check engine light, an inaccurate outside-temperature display, or climate-control behavior that seems off. Broadly, the possible fault areas can include the ambient temperature sensor circuit, the connector, the wiring, or the PCM input side of the circuit.
Diagnostic path
From this point, the diagnostic path sends you into the dedicated circuit test for the ambient temperature input. That circuit test is the part that is needed to make the next decision, but the actual test steps are not available here. So do not guess at the sensor, wiring, or module from the code alone. Pause, recheck the earlier diagnostic path, and avoid making a repair decision until the correct circuit test procedure is available.
Verification boundary and takeaway
Keep verification separate from testing. Since the circuit test and repair path are not available, repair verification cannot be honestly narrated from this diagnostic path. The takeaway is simple: P0073 is a high ambient air temperature circuit code, but the code by itself is not a parts call. Complete the proper circuit diagnosis before deciding what failed. For more diagnostic training, visit stepdiagnostics.com.
Final check
P0073 often needs circuit diagnosis before any repair decision is made.
For more guided automotive diagnostics, visit STEP Diagnostics.
