How is fault code P007D fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Read the live data for charge air cooler temperature with the engine cold. A circuit reading the maximum value, often something silly like -40C or way over 130C, confirms the sensor is electrically out of touch rather than just a bit off 2. Unplug the sensor connector and look at it properly. Green or white corrosion on the pins, a cracked connector body, or wiring rubbed bare against the intercooler pipe will show up here and is the most common find 3. Back-probe the connector with the ignition on and check you've got the 5-volt reference. No reference means the fault is in the feed side or the ECU, not the sensor 4. Measure the sensor's resistance across its terminals and watch it change as it warms in your hand. A good NTC sensor drops in resistance as temperature rises. No change, or an open reading, condemns the sensor 5. Check continuity from the sensor signal pin back to the ECU pin, and do the same on the earth side. A break here is what's driving the high voltage, and finding i

Charge Air Cooler Temperature Sensor Circuit High Bank 1

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Read the live data for charge air cooler temperature with the engine cold. A circuit reading the maximum value, often something silly like -40C or way over 130C, confirms the sensor is electrically out of touch rather than just a bit off 2. Unplug the sensor connector and look at it properly.

PPowertrain
0Generic code
0Fuel / Air
7DSequence number

What does it mean?

A stored code P007D – Charge Air Cooler Temperature Sensor Circuit High code indicates that the powertrain control module (PCM) has detected excessive voltage on the charge air cooler temp sensor (CACTS) circuit. This type of code pertains to vehicles equipped with turbochargers and superchargers exclusively. This type of code can be particularly confusing since the heading seems to denote “high” voltage.

Like most intake air temperature monitoring circuits, the CACTS circuit utilizes a 5-volt maximum reference signal that is diminished as the flow of intake air increases across an exposed thermal resistor. Therefore, a high voltage code (P007D) is typically caused by an open in the CACTS circuit. The CACTS is threaded into the air duct in a manner that allows intake air to flow freely across an exposed hot wire with an integrated thermal resistor.

The CACTS circuit is supplied with a 5-volt reference and a ground. The exposed hot wire and thermal resistor complete the circuit. As the flow of intake air increases across the exposed hot wire, CACTS circuit voltage decreases due to increased resistance in the thermal resistor. The PCM compares input data voltage received from various sources – such as the manifold absolute pressure (MAP) sensor – to CACTS circuit voltage and calculates whether it is within specified parameters.

If CACTS circuit voltage is not within specifications, a code will be stored, and a malfunction indicator lamp (MIL) may be illuminated.

Symptoms

Likely causes

How to fix it

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This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.