Code Definition

P00A4 — Intercooler Temperature Sensor Signal Intermittent - Bank 2

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P00A4

P00A4 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P00A4 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P00A4 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P00A4 fault code is set when the Engine Control Module (ECM) detects intermittent readings or signal disruptions from the Charge Air Cooler (CAC) temperature sensor, also known as the intercooler temperature sensor, in Bank 2. This sensor is important in turbocharged or supercharged engines, as it measures the temperature of the air after being cooled by the intercooler. The intercooler's function is to lower the temperature of compressed air from the turbocharger or supercharger before it enters the engine, thereby improving air density and combustion efficiency. Intermittent issues with ...

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