What Does P00A1 Mean?
The PCM has detected that the charge air cooler temperature sensor on bank 2 is reporting values outside the expected range or is not responding appropriately to changes in operating conditions. The sensor may be reading within its electrical range but the values don't correlate with engine load, boost pressure, and ambient temperature. The driver may notice reduced performance as the PCM enters a protective mode to prevent potential engine damage from inaccurate temperature data.
Common Causes
30%
Degraded or drifted charge air cooler temperature sensor providing inaccurate but in-range readings
25%
Charge air cooler (intercooler) clogged externally with debris reducing cooling efficiency
20%
Charge air cooler internal leak or restriction on bank 2 affecting airflow past the sensor
15%
Intermittent wiring issue causing erratic resistance in the sensor circuit
10%
Sensor installed in wrong location or incorrect part number
Diagnostic Steps
1
Compare bank 2 CAC temperature PID to bank 1 (if equipped) during steady-state driving at various loads — they should track closely. A significant deviation points to a bank 2-specific issue.
2
Monitor the CAC temperature sensor reading during a boost event — temperature should rise with increased boost pressure and then decrease as boost tapers off. Flat or erratic response indicates sensor failure.
3
Visually inspect the intercooler for external blockage (bugs, dirt, road debris in the fins) that would reduce cooling efficiency and cause legitimately high temperature readings.
4
Check the intercooler and boost piping on bank 2 for leaks using a boost leak tester — a leak would reduce airflow through the cooler and affect sensor readings.
5
Remove the sensor and bench-test it in a controlled temperature environment (e.g., hot water at known temperature) to verify the resistance curve matches specifications.
Estimated Repair Cost
$75 - $500
Parts + labor, varies by vehicle and location
The PCM has detected that the charge air cooler temperature sensor on bank 2 is reporting values outside the expected range or is not responding appropriately to changes in operating conditions. The sensor may be reading within its electrical range but the values don't correlate with engine load, bo...
The most common cause of P00A1 (Charge Air Cooler Temperature Sensor Circuit Range/Performance Bank 2) is: Degraded or drifted charge air cooler temperature sensor providing inaccurate but in-range readings
Typical repair costs for P00A1 range from $75 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driving is possible but the PCM may limit boost or retard timing to protect the engine. If the intercooler itself is compromised, continued high-load driving could cause detonation or pre-ignition damage. Avoid heavy acceleration until diagnosed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P00A1 to identify the root cause.
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Quick Info
Category
Powertrain
System
Forced Induction / Turbocharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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