What Does P00A5 Mean?
The PCM has detected a general circuit malfunction with the intake air temperature sensor 2 on bank 2. This secondary IAT sensor provides additional temperature monitoring at a different location in the intake tract (often post-intercooler or in a separate intake runner). The PCM uses this data for fine-tuning fuel delivery and spark timing. A circuit fault means the sensor data is unreliable, and the PCM will use a substitute value that may not be optimal.
Common Causes
35%
Failed intake air temperature sensor 2 on bank 2
25%
Damaged wiring or connector in the IAT sensor 2 bank 2 circuit
20%
Corroded or loose connector pins causing unreliable electrical contact
12%
5V reference voltage missing at the sensor due to shared reference circuit fault
8%
PCM internal fault on the IAT2 bank 2 sensor input circuit
Diagnostic Steps
1
Read the IAT sensor 2 bank 2 PID — compare it to ambient temperature with the engine cold. It should be within 5°F/3°C. A reading of -40°F indicates open circuit; extremely high readings indicate a short.
2
Disconnect the IAT sensor 2 connector on bank 2 and measure resistance across the sensor terminals — compare to the manufacturer's spec (typically 2–3 kΩ at 68°F/20°C for NTC thermistors).
3
Verify 5V reference voltage is present at the harness-side connector with the sensor unplugged and key on — if missing, check the reference circuit back to the PCM and look for a shorted sensor on the same reference line.
4
Check for proper ground at the harness connector — measure voltage drop on the ground pin relative to battery negative (should be less than 100 mV).
5
Inspect the sensor and connector for physical damage, oil contamination, or heat damage from nearby exhaust components.
Estimated Repair Cost
$60 - $300
Parts + labor, varies by vehicle and location
The PCM has detected a general circuit malfunction with the intake air temperature sensor 2 on bank 2. This secondary IAT sensor provides additional temperature monitoring at a different location in the intake tract (often post-intercooler or in a separate intake runner). The PCM uses this data for ...
The most common cause of P00A5 (Intake Air Temperature Sensor 2 Circuit Bank 2) is: Failed intake air temperature sensor 2 on bank 2
Typical repair costs for P00A5 range from $60 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driving is generally safe but the engine may run less efficiently with a substitute temperature value. Fuel economy may decrease and emissions may increase. No immediate safety hazard but repair is recommended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P00A5 to identify the root cause.
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Quick Info
Category
Powertrain
System
Intake Air System
Difficulty
Type
Generic (SAE)
Recommended Tools
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