Powertrain (Engine & Gearbox)Standard EOBD

P007A - Charge Air Cooler Temperature Sensor Circuit - Bank 1

Q: What are the symptoms of fault code P007A?

• Check Engine Light (MIL) illumination • Reduced engine performance (Limp mode) • Increased fuel consumption • Hesitation during acceleration • Emission test failure

Q: What causes fault code P007A?

• Most likely: Faulty Charge Air Cooler Temperature (CACT) sensor - internal failure • Likely: Damaged wiring harness or corroded connectors (common due to vibration and heat cycles) • Possible: Heavily fouled or restricted intercooler causing implausible readings • Rare: Faulty Engine Control Unit (ECU)

Q: How do you fix fault code P007A?

STEP 1: Visual inspection of the sensor and connector. Check for oil contamination, corrosion, or frayed wiring. STEP 2: Voltage test. With ignition ON, verify 5V reference signal and a solid ground at the connector. STEP 3: Resistance test. Remove the sensor and measure OHMs. At 68°F (20°C), it should typically read between 2k-3k Ohms. Check for linear response using a heat source. STEP 4: Use live data to compare CACT with IAT and ECT on a cold soak. If CACT deviates significantly, the sensor is likely skewing. STEP 5: Replace sensor if electrical tests fail and clear the DTC.

Last updated:1 February 2026

Related:Charge Air Cooler Temperature Sensor (CACT), Intercooler, Turbocharger, Engine Control Unit (ECU), Wiring Harness

System

Powertrain (Engine & Gearbox)

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Technical Description

P007A is a generic OBD-II diagnostic trouble code (DTC) indicating a malfunction in the Charge Air Cooler Temperature (CACT) sensor circuit for Bank 1. The CACT sensor is an NTC thermistor located between the turbocharger/supercharger and the intake manifold. The ECU monitors the voltage signal to determine the density of the pressurized air, which is critical for fuel injection timing and boost pressure control. If the ECU detects an out-of-range voltage or an implausible signal that does not match other sensors like IAT (Intake Air Temp) or ECT (Engine Coolant Temp) during cold start, this code is triggered.

Possible Causes

Faulty Charge Air Cooler Temperature (CACT) sensor - internal failure

Damaged wiring harness or corroded connectors (common due to vibration and heat cycles)

Heavily fouled or restricted intercooler causing implausible readings

Faulty Engine Control Unit (ECU)

Symptoms

Check Engine Light (MIL) illumination

Reduced engine performance (Limp mode)

Increased fuel consumption

Hesitation during acceleration

Emission test failure

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P007A - Charge Air Cooler Temperature Sensor Circuit - Bank 1

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P007A - Charge Air Cooler Temperature Sensor Circuit - Bank 1

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