P00DC Ambient Air Temperature Sensor Circuit B High

Ambient air temperature sensor B is a second, separate ambient temperature circuit in addition to sensor A. What the second measuring point is used for in a given vehicle could not be documented; the value may be wired directly to the control module or come over the data bus. Regulations require monitoring of such inputs because ambient temperature is often an enabling condition for other diagnostics. None of the manufacturer documents searched uses these codes; the explanation follows sensor A. P00DC: The signal is above its valid range. Which fault gives a low or high signal depends on the sensor wiring: with the usual NTC pull-up circuit a low signal means a short to ground and an extremely high reading, a high signal an open circuit and an extremely low reading, but at least one manufacturer documents the opposite assignment.

Likely causes

Symptoms

• Wrong or missing outside temperature display
• Climate control regulates incorrectly
• Check engine light on (manufacturer-dependent)

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com.