Code
P00A7
Generic
P — Powertrain
Intake Air Temperature Sensor 2 Circuit Low Bank 2
Views:
UK: 18
EN: 25
RU: 20
AI status
Completed
Completed
100%
Causes
- Short to ground in the IAT2 wiring harness
- Failed/shorted intake air temperature sensor 2 (bank 2)
- Corroded, loose or damaged sensor connector or pins
- Wiring chafe, connector contamination or water intrusion
- Poor ground or reference from the engine control module (ECM)
- ECM input circuit fault
Symptoms
- Check Engine Light (MIL) illuminated
- Incorrect/very low intake air temperature reading in live data
- Rich running condition, poor fuel economy or rough idle on cold start
- Hard starting or increased emissions
- Reduced engine performance or limp mode in some vehicles
What to check
- Retrieve freeze-frame data and confirm P00A7 active/past and related codes
- Scan-tool: view live IAT2 voltage/temperature and compare to ambient and IAT1 (if present)
- Visual inspection of the sensor, connector and wiring for damage, corrosion, water or pin push-out
- Wiggle test wiring and connectors while monitoring live data for intermittent changes
- Check for other related codes (MAF, MAP, ECT) that could indicate shared wiring/grounds
Signal parameters
- Typical IAT sensor signal range: ~0.2–4.8 V across normal temp range (varies by manufacturer)
- Low-circuit condition typically shows sensor voltage near 0.0–0.2 V (indicates short to ground)
- Open-circuit/no-signal typically shows >4.5 V or no continuity
- IAT element resistance is temperature dependent (NTC sensors). A common nominal at ~25°C is in the kΩ range (varies by sensor). Always consult vehicle-specific specs before replacing
Diagnostic algorithm
- Read and record freeze frame and all stored codes. Clear code and retest to confirm repeatability.
- With key ON (engine OFF) monitor IAT2 live voltage/temperature. Note value and compare to ambient and IAT1 if available.
- Perform a visual inspection of the sensor, boot, connector and wiring for damage, corrosion, bent pins or water. Repair any obvious issues.
- Back-probe sensor connector: measure sensor signal voltage to ground with key ON. If voltage is 4.5 V or no reading suspect open/high circuit.
- With engine OFF remove sensor and measure sensor resistance at ambient. Compare to manufacturer specification (if out of spec, replace sensor).
- Check continuity between sensor connector and ECM input pin; check for short to ground on the harness (repair wiring if > specified resistance or short present).
- If wiring and sensor check good, inspect ECM connector for corrosion/pushed pins and test ECM input for correct reference/pull-up (refer to service manual).
- Repair or replace faulty wiring, connector or sensor. After repairs, clear codes and perform a road test and recheck for recurrence.
- Safety note: disconnect battery or ensure ignition OFF when repairing wiring/connectors; avoid contact with hot intake components.
Likely causes
- Short to ground in the sensor harness or damaged wiring (most common)
- Faulty IAT2 sensor element
- Corroded or pushed-out connector pin at the sensor or ECM
- Water intrusion or contamination in connector
- ECM input damage (least common)
Fault status
Status
Intake Air Temperature Sensor 2 (Bank 2) circuit low — sensor reporting abnormally low voltage or short to ground.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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