Code
P00AA
Generic
P — Powertrain
Intake Air Temperature Sensor 1 Circuit Bank 2
Views:
UK: 21
EN: 32
RU: 32
AI status
Completed
Completed
100%
Causes
- Open or short in the IAT sensor wiring (signal, reference, or ground)
- Corroded, loose, or damaged connector at the IAT sensor
- Faulty IAT sensor (thermistor failure)
- Short to battery or ground elsewhere in the harness
- PCM input fault or internal circuit failure
- Severe contamination or heat damage to the sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running, or hesitation under load
- Incorrect air/fuel trim or increased fuel consumption
- Hard starting when ambient temperature is extreme
- Freeze frame may show implausible intake air temperature (very high or very low)
What to check
- Scan for active/confirmed P00AA and view freeze-frame / live IAT data for Bank 2
- Compare Bank 2 IAT reading to Bank 1 IAT (if present) and to ambient temperature
- Visually inspect sensor connector and wiring for corrosion, bent pins, damage, or contamination
- Backprobe sensor connector and measure reference voltage and signal with key on
- Measure sensor resistance (with engine off) and compare to known temperature chart if available
- Wiggle test harness while monitoring live data to reproduce intermittent faults
Signal parameters
- Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
- Reference voltage: commonly 5 V (verify with manufacturer data)
- Expected signal voltage range: roughly 0.2 V to 4.8 V depending on ambient temperature and sensor (varies by vehicle)
- Typical resistance behavior: high resistance at low temps and low resistance at high temps (example: kΩ range at 20–25°C on many sensors — check OEM chart)
- Open-circuit symptom: signal stuck near reference rail (often high voltage) or no changing response
- Short-to-ground symptom: signal near 0 V; short-to-battery: signal near reference voltage
Diagnostic algorithm
- Retrieve freeze-frame and live IAT Bank 2 values with a scan tool. Note when code set and compare to ambient temperature.
- Visually inspect Bank 2 IAT sensor and connector. Remove connector, check pins for corrosion, bent pins, or contamination, and secure connector fit.
- With ignition ON (engine off), backprobe the connector: verify reference voltage (usually ~5 V) and good ground. If reference missing, trace to PCM and check for short/open.
- Measure sensor resistance at the sensor plug (engine cold). Compare to OEM resistance vs temperature chart if available. If resistance is out of expected trend, replace sensor.
- If voltages and resistance at the sensor are good, backprobe the signal at the PCM connector to confirm signal is reaching the PCM. Check for unexpected shorts to power or ground.
- Perform wiggle/stress tests on harness while monitoring live data to find intermittent opens or shorts. Repair any damaged wiring or connectors found.
- If wiring and sensor test good but code returns, perform PCM input/output tests per manufacturer procedures or consider PCM reflash/replace only after verifying harness and sensor.
- Clear codes and road-test to confirm repair; re-scan and verify code does not return.
Likely causes
- Disconnected or corroded connector at Bank 2 IAT sensor
- Broken wire or chafed harness in the engine bay near the intake
- Water intrusion or oil contamination in the sensor connector
- Failed NTC thermistor inside the IAT sensor
Fault status
Status
Intake Air Temperature Sensor 1 Circuit Bank 2 — signal out of expected range (open/short/implausible).
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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