P007D - Charge Air Cooler Temperature Sensor Circuit High (Bank 1)
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P007D is set when the Engine Control Unit (ECU) detects a voltage signal from the Charge Air Cooler Temperature (CACT) sensor that is higher than the expected threshold (typically near 5V reference). This indicates an open circuit, high resistance, or a failed sensor. The CACT sensor monitors the temperature of the air exiting the intercooler before it enters the intake manifold. The ECU uses this data to adjust fuel trim, ignition timing, and boost pressure to ensure engine longevity and efficiency.
Possible Causes
Faulty CACT or combined MAP/Temp sensor
Poor connection or oxidized terminals at the sensor connector
Wiring harness open circuit on the signal or ground wire to the ECU
Internal ECU failure
Symptoms
Recommended Solution
- Visual inspection: Check the sensor connector for corrosion or loose pins. Inspect wiring for chafing or breaks.
- Multimeter test (Voltage): Measure reference voltage with ignition on. It should be approximately 5V. Verify ground connectivity.
- Resistance test: Measure resistance across sensor terminals. Values typically range from 2k Ohms to 40k Ohms depending on temperature. An open circuit (OL) indicates a failed sensor.
- Scan Tool: Check Live Data for Charge Air Temp. If it reads -40°C, it confirms an open circuit.
- Component replacement: Replace the CACT sensor if measurements are out of spec.
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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