P007B — Charge Air Cooler Temperature Sensor Circuit Range/Performance Bank 1

Causes

• Damaged or corroded sensor connector or wiring (open, short to ground or short to power).
• Failed charge air cooler (intercooler) temperature sensor (NTC or similar).
• Poor or missing ground or reference 5V supply to the sensor.
• Contamination or fluid (oil/coolant) fouling the sensor element.
• Intermittent connector contact from vibration or heat.
• Faulty engine control module (rare).

Symptoms

• MIL/Check Engine Light illuminated and code P007B stored.
• Freeze frame may show abnormal charge air cooler temp or no change with ambient changes.
• Reduced boost control performance or limp-home strategy in some vehicles.
• Poor drivability or incorrect fueling/trim values if the ECU uses this input for air charge correction.
• Intermittent running conditions when the wiring is disturbed.

What to check

• Read and record freeze frame and live PID data for charge air cooler temperature, intake air temp, and related PIDs.
• Visually inspect sensor, connector, and wiring harness for damage, corrosion, oil, or water ingress.
• Wiggle test harness while monitoring live PID to check for intermittent faults.
• Check for proper 5V reference and ground at the sensor connector (backprobe).
• Measure sensor resistance at known ambient temperature and compare to expected type behavior while changing temperature (warm/cool sensor).
• Inspect intercooler and intake tract for oil contamination that can affect sensor reading.

Signal parameters

• Most charge air temp sensors are NTC thermistors: resistance decreases as temperature increases. Typical generic values (varies by vehicle): ~2–10 kΩ at ~25 °C.
• Sensor supply: usually a 5 V reference from PCM; expected sensor voltage typically ~0.5–4.5 V across cold-to-hot range (low voltage = hot, high voltage = cold for NTC; confirm polarity for vehicle).
• Operating range: approximately -40 °C to +125 °C for intake/charge air sensors.
• Expected continuity: low resistance (

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