What causes fault code P00A0?

• Most likely: Faulty Charge Air Cooler Temperature Sensor (internal open or short) • Likely: Damaged wiring harness or corroded connectors near the sensor (exposed environment) • Possible: Obstruction or debris blocking the face of the intercooler, causing readings out of range • Rare: Faulty Engine Control Module (ECM) or software error

How do you fix fault code P00A0?

STEP 1: Visually inspect the sensor and wiring. Check for chafing or corrosion in the connector pins. STEP 2: Use a scan tool to monitor Live Data. Compare CAC temperature with IAT temperature on a cold engine; they should be within 2-3 degrees of each other. STEP 3: Unplug the sensor and verify 5V reference voltage from the ECM and a clean ground. STEP 4: Measure sensor resistance with an ohmmeter. At 68°F (20°C), it should typically measure 2k-3k Ohms. If OL (Open Loop) is detected, replace the sensor. STEP 5: Clear DTCs and perform a test drive to confirm the fix.

Powertrain (Engine & Gearbox)Standard EOBD

P00A0 - Charge Air Cooler Temperature Sensor Circuit – Bank 1

Q: What are the symptoms of fault code P00A0?

• Check Engine Light (MIL) illuminated • Reduced engine performance (Derated boost pressure) • Increased fuel consumption • Vehicle may enter 'Limp Home Mode' • Potential black smoke during acceleration due to incorrect AFR

Last updated:1 February 2026

Related:Charge Air Cooler Temperature Sensor, Intercooler, ECU/PCM, Wiring Harness, Turbocharger/Supercharger

System

Powertrain (Engine & Gearbox)

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Technical Description

P00A0 is a generic OBD-II diagnostic trouble code (DTC) indicating a fault within the Charge Air Cooler (CAC) temperature sensor circuit for Bank 1. The ECM/PCM monitors the sensor's voltage to determine the efficiency of the intercooler. The sensor is typically a thermistor that changes resistance based on temperature. If the ECM detects a voltage signal that is inconsistent with operating conditions or out of a predetermined range, it will trigger the MIL and may limit boost pressure to protect the engine from pre-ignition caused by high intake temperatures. This code focuses on the sensor that measures air temperature after it has passed through the charge air cooler.

Possible Causes

Faulty Charge Air Cooler Temperature Sensor (internal open or short)

Damaged wiring harness or corroded connectors near the sensor (exposed environment)

Obstruction or debris blocking the face of the intercooler, causing readings out of range

Faulty Engine Control Module (ECM) or software error

Symptoms

Check Engine Light (MIL) illuminated

Reduced engine performance (Derated boost pressure)

Increased fuel consumption

Vehicle may enter 'Limp Home Mode'

Potential black smoke during acceleration due to incorrect AFR

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P00A0 - Charge Air Cooler Temperature Sensor Circuit – Bank 1

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P00A0 - Charge Air Cooler Temperature Sensor Circuit – Bank 1

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