P0072

Ambient Air Temperature Sensor Circuit A Low

Q: Is it safe to drive with P0072?

Yes. The ambient air temperature sensor feeds the temperature display and climate system, not core engine control, so the car drives normally. It's low priority but still worth fixing to clear the light.

Q: Can I just clear P0072?

It will return if the wiring short or failed sensor is still present, since the ECM keeps monitoring the circuit.

Ambient air temperature sensor Generic OBD-II Low

What it means

P0072 means the ambient (outside) air temperature sensor circuit is reading a lower voltage than expected, usually pointing to a short to ground or a failed sensor. This sensor feeds the outside-temperature display and climate-control logic rather than core engine management, so the engine runs normally and the practical impact is minor — but the check-engine light stays on until it's fixed.

Low

Can I keep driving? Safe to drive — the engine runs normally; this sensor mainly feeds the outside-temperature display and climate control, so the impact is minor.

Real-world scan data

Seen in

164

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Outside-temperature display reads incorrectly (often stuck very low)
Climate control or auto-defog behaving oddly
Usually no change in how the engine drives

Common causes

Most likely first

Short to ground in the ambient air temperature sensor wiringLikely
Failed ambient air temperature sensor reading out of range lowCommon
Corroded or damaged connector at the sensorCommon
Faulty engine control module (ECM), rarelyLess often

How to diagnose & fix

Work through it in order

Locate the ambient air temperature sensor (usually behind the front grille or bumper).
Inspect its connector and wiring for a short to ground, corrosion, or damage.
Compare the sensor's live reading to the actual outside temperature; a stuck-low value confirms the fault.
Repair the wiring or replace the sensor if it reads out of range.
Clear the code and confirm the temperature reading is realistic.

FAQ

Quick answers

Is it safe to drive with P0072?+

Yes. The ambient air temperature sensor feeds the temperature display and climate system, not core engine control, so the car drives normally. It's low priority but still worth fixing to clear the light.

Can I just clear P0072?+

It will return if the wiring short or failed sensor is still present, since the ECM keeps monitoring the circuit.

Read & clear P0072 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX