P007B - Charge Air Cooler Temperature Sensor Circuit Range/Performance (Bank 1)
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P007B is stored when the Engine Control Module (ECM) detects an implausible signal from the Charge Air Cooler Temperature (CACT) sensor. The CACT sensor is a thermistor that monitors the temperature of the air exiting the intercooler. The ECM compares the CACT signal against other sensors like the Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) during cold starts and under load. If the sensor's voltage output remains static or is outside the calibrated range for a specific operating condition, the P007B code is triggered. This signal is crucial for accurate fuel mapping and boost control.
Possible Causes
Faulty CACT sensor (internal electrical failure or sensor bias due to oil/dirt)
Damaged wiring harness or corrosion in the sensor connector
Restricted or inefficient Charge Air Cooler (intercooler)
ECM software error or internal control module failure
Symptoms
Recommended Solution
Workflow
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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