P00A2: Charge Air Cooler Temperature Sensor Circuit Low Bank 2

The charge air cooler temperature sensor for bank 2 (an NTC thermistor) measures the charge air temperature in the second charge-air path, for example on V engines with two charge air coolers. The engine control module uses it for the air mass calculation, boost control and component protection. For P00A2, the sensor signal is below its valid range. With the usual voltage-type NTC sensor this means a short to ground, and the control module reads an extremely high temperature; some manufacturers use sensors with a frequency output, where a low signal instead corresponds to an extremely low temperature (open circuit or short to ground). Bank 2 codes occur only on engines with two separate intake or charge-air paths, one per cylinder bank.

Low severity. Can I keep driving?Yes, you can normally keep driving and take it to a repair shop when convenient.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

Check engine light on
Usually no noticeable symptoms
Slightly changed power or knock control with an implausible reading

Most likely causes

Sensor shorted internally or signal wire shorted to ground
Connector damp or corroded
On frequency-output sensors: open circuit
Engine control module faulty

What to check, in order

Start with the simplest. You can tick off each step.

With the engine cold, compare the reading with the outside temperature
With the connector unplugged, check whether the signal wire is making contact with ground.
Check the connector
Measure the sensor's resistance against the manufacturer's specification
Check power and ground before replacing it

Good to know

Repair difficulty: easy
It affects emissions.

What each character of P00A2 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
0: Subsystem depends on the code range
A2: Specific fault in that system

Frequently asked questions

Can I keep driving with code P00A2?

Yes, you can normally keep driving and take it to a repair shop when convenient.

What causes code P00A2?

The most common causes are: sensor shorted internally or signal wire shorted to ground; connector damp or corroded; on frequency-output sensors: open circuit.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.