P00A7
Intake Air Temperature Sensor 2 Circuit Low Bank 2.
- Generic
- Powertrain
- Generic code
- Low severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 0
- AreaFuel and air metering, auxiliary emission controls
- A7
- FaultThe specific fault in that area
What it means
P00A7 means the engine control unit has seen the signal from intake air temperature sensor 2 on bank 2 fall below the expected range. A low signal voltage reads as an extremely high air temperature, so it usually points to a short to ground in the circuit or a faulty sensor. Which part of the intake this sensor monitors depends on the engine and model.
Symptoms
- Engine warning light on
- Reduced power or hesitation under load
- Poor fuel economy
- Rough running or poor starting in some cases
- Boost or charge-air related performance limits on turbocharged engines
- Implausible intake air temperature reading on a scan tool
Possible causes
- Intake air temperature sensor 2 (bank 2) faulty internally, reading shortedlikely
- Signal wire chafed or shorted to ground in the harnesslikely
- Water or corrosion in the sensor connector causing a low signalpossible
- Damaged or pushed-out connector terminalspossible
- Sensor ground or reference circuit fault affecting the readingpossible
- Genuinely very high intake air temperature from heat soak or a charge-air cooling problemrare
- Faulty engine control unit input circuitrare
How to diagnose
- Read the stored codes and freeze frame data to see engine temperature, load and conditions when the fault set, and check for other intake air temperature or sensor supply codes.
- Compare live intake air temperature 2 with the other intake air temperature sensor and ambient temperature on a cold engine. They should be close.
- Visually inspect the sensor, connector and harness on bank 2 for chafing, heat damage, water ingress, corrosion and bent or loose terminals.
- With the ignition on, watch live data while gently wiggling the harness and connector to find an intermittent short.
- Unplug the sensor and check the reading. If it changes to a very cold or default value, the wiring to the control unit is likely sound and the sensor is suspect.
- Measure the sensor resistance and compare it to the manufacturer's temperature chart, as values vary by model.
- Check the signal wire for a short to ground and the ground and reference circuits for continuity, following the wiring diagram for the vehicle.
- If the wiring and sensor test fine, check for a charge-air heat problem and only then consider the control unit input.
How to fix
- Replace intake air temperature sensor 2 if its resistance or live reading is out of specification.
- Repair or replace the chafed or shorted wiring and secure it away from heat and sharp edges.
- Clean, dry and repair the connector, or replace it if the terminals are corroded or damaged.
- Repair any ground or reference circuit fault found during testing.
- Fix any charge-air cooling or heat soak issue if the temperature reading is proven genuine.
- Clear the code after repair and road test to confirm it does not return.
Can I keep driving?
Low severity
The car can usually be driven, but the control unit may use a default air temperature, which can affect power and economy. Book it in soon, and stop if you notice severe loss of power or rough running.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.