Faulty bank 2 charge air cooler temperature sensor (internal short); Signal wire chafed or shorted to ground, or to the sensor ground return; Water, oil or corrosion in the sensor connector pulling the signal low; Damaged wiring loom near hot or moving parts such as turbo pipework; Sensor genuinely reading very hot due to a charge air cooler or cooling problem (check against actual temperature); Fault inside the engine control unit's sensor input.

P00A2

Charge Air Cooler Temperature Sensor Circuit Low Bank 2.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
A2: FaultThe specific fault in that area

What it means

P00A2 means the engine control unit saw the signal from the bank 2 charge air cooler temperature sensor fall below the expected voltage range. The sensor measures the temperature of the intake air after the turbo or supercharger and cooler. A low voltage usually points to a short to ground in the circuit or a faulty sensor. Which sensor is bank 2 and where it sits depends on the engine, so check the model-specific layout.

Symptoms

Engine warning light on
Reduced power or the engine going into a limited performance mode
Poor or uneven boost response
Rough running or hesitation under load
Slightly higher fuel consumption

Possible causes

Faulty bank 2 charge air cooler temperature sensor (internal short)likely
Signal wire chafed or shorted to ground, or to the sensor ground returnlikely
Water, oil or corrosion in the sensor connector pulling the signal lowpossible
Damaged wiring loom near hot or moving parts such as turbo pipeworkpossible
Sensor genuinely reading very hot due to a charge air cooler or cooling problem (check against actual temperature)rare
Fault inside the engine control unit's sensor inputrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including engine load, coolant temperature and intake air temperature when the fault set.
Check for related codes on bank 1 or other intake temperature sensors, which would suggest a shared wiring or ground problem.
Inspect the sensor connector and the wiring to it for damage, chafing, heat damage, moisture or corrosion.
With the engine cold, compare the live bank 2 charge air cooler temperature reading with the intake air and coolant temperatures; they should be close.
Unplug the sensor with the ignition on and watch the live value. If the reading changes to a high-temperature fault or open circuit value, the wiring to the sensor is likely sound.
Measure the sensor resistance and compare it with the manufacturer's temperature-resistance table for your model.
Check the sensor supply and ground at the connector, and test the signal wire for a short to ground with the control unit unplugged, following the wiring diagram.
Check the charge air cooler and its pipework for damage or blockage to rule out a real temperature problem.

How to fix

Replace the bank 2 charge air cooler temperature sensor if its readings or resistance are out of specification.
Repair or replace the damaged wiring section, and secure it away from heat and sharp edges.
Clean or replace the corroded or wet connector terminals and fix the source of water or oil ingress.
Repair any charge air cooler, hose or cooling fault that is causing a genuinely abnormal temperature.
Clear the code after repair and road test to confirm it does not return; only consider control unit repair after all wiring and sensor checks pass.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but the control unit may reduce boost and power and fuelling may be less accurate. Get it checked soon, and stop if you notice severe power loss, knocking or overheating.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.