A short to ground in the intake air temperature sensor 3 signal circuit, often from chafed wiring against a bracket or engine component; A failed intake air temperature sensor 3 that internally shorts and returns a permanently low voltage; Corroded, loose, or water-intruded connector pins at the sensor or at the PCM, creating unwanted resistance to ground; A shorted sensor circuit inside a shared harness with another sensor, especially where wires are routed near hot exhaust parts; A faulty powertrain control module, though this is far less common than wiring or sensor faults; Aftermarket accessories or alarm wiring tapped into the sensor circuit and pulling the signal low; A missing or damaged sensor ground that causes the signal to float low rather than a true short

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P00EA

P00EAIntake Air Temperature Sensor 3 Circuit Low Bank 1

Q: What does code P00EA mean?

Intake Air Temperature Sensor 3 Circuit Low Bank 1. P00EA indicates that the powertrain control module has detected an abnormally low voltage signal on the intake air temperature sensor 3 circuit for bank 1, which typically means the sensor is reporting a hotter-than-actual intake air charge or the circuit is shorted to ground. The computer compares the sensor's return voltage against expected values and flags the code when the signal stays below the calibrated threshold for a set time.

P00EA indicates that the powertrain control module has detected an abnormally low voltage signal on the intake air temperature sensor 3 circuit for bank 1, which typically means the sensor is reporting a hotter-than-actual intake air charge or the circuit is shorted to ground. The computer compares the sensor's return voltage against expected values and flags the code when the signal stays below the calibrated threshold for a set time.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or hesitation when the engine is cold, because the fuel mixture may be too lean
Poor fuel economy as the computer enriches the mixture based on a falsely hot intake air reading
Elevated idle speed or unstable idle quality during warm-up
In rare cases, a no-start condition if the sensor signal is completely shorted and the PCM misjudges air density
Intermittent drivability issues that appear only in certain ambient temperatures or after the engine bay heat-soaks

Common causes, most likely first

A short to ground in the intake air temperature sensor 3 signal circuit, often from chafed wiring against a bracket or engine component
A failed intake air temperature sensor 3 that internally shorts and returns a permanently low voltage
Corroded, loose, or water-intruded connector pins at the sensor or at the PCM, creating unwanted resistance to ground
A shorted sensor circuit inside a shared harness with another sensor, especially where wires are routed near hot exhaust parts
A faulty powertrain control module, though this is far less common than wiring or sensor faults
Aftermarket accessories or alarm wiring tapped into the sensor circuit and pulling the signal low
A missing or damaged sensor ground that causes the signal to float low rather than a true short

How to diagnose and fix it

Connect a scan tool and record the intake air temperature 3 live data value cold and after warm-up to confirm the signal is stuck low or reading unrealistically high
Visually inspect the sensor, its connector, and the wiring harness for chafing, corrosion, or signs of rodent damage before touching any parts
Disconnect the sensor and measure resistance across its terminals, comparing to the manufacturer's temperature-resistance chart to rule out an internally shorted sensor
With the sensor unplugged and the key on, back-probe the signal circuit to check for a short to ground using a multimeter, then wiggle the harness to catch intermittent faults
Check for continuity between the sensor ground circuit and chassis ground, and repair any high-resistance ground connection that could skew the signal
If the circuit tests clean, substitute a known-good sensor and clear the code to see whether the fault returns before condemning the PCM
After repairs, clear the diagnostic trouble codes and verify the intake air temperature 3 reading tracks ambient and engine bay temperatures during a road test

What a low IAT 3 signal really means

A low signal voltage does not automatically mean the sensor is bad, because a shorted signal wire or a poor ground will produce the same low reading and replacing the sensor will not fix it
On vehicles with multiple intake air temperature sensors, sensor 3 is often part of a combined mass airflow or manifold absolute pressure sensor, so the fault may live inside a costly assembly rather than a stand-alone sensor
The PCM may use intake air temperature 3 for torque management and EGR scheduling, so a low signal can cause subtle power delivery changes that drivers notice before any hard fault appears
Heat soak after a hot shutdown can push the sensor reading high enough to trigger a low-voltage code intermittently, so the fault may not be present during a cold-morning inspection
A code reader that only shows the stored code will miss pending or history data that reveals whether the fault is active or was a one-time glitch, so always review freeze-frame information

Can I keep driving with P00EA?

The vehicle remains safe to drive because this fault mainly affects fuel mixture accuracy and emissions rather than immediate engine safety, but avoid heavy towing or sustained high-load driving until the circuit is repaired. Have the fault diagnosed soon to prevent long-term catalyst damage from an overly rich mixture.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.