Faulty charge air cooler temperature sensor (internal short); Signal wire chafed and shorted to earth; Water, oil or corrosion in the sensor connector causing a low signal; Damaged or loose connector terminals at the sensor or control unit; Sensor reference supply (5 V) wiring fault or shared sensor circuit fault; Faulty engine control unit.

P007C

Charge Air Cooler Temperature Sensor Circuit Low Bank 1.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
7C: FaultThe specific fault in that area

What it means

P007C means the engine control unit has detected a voltage from the charge air cooler temperature sensor circuit on Bank 1 that is lower than the expected range. A low voltage signal usually means a short to earth in the wiring or a sensor fault. The control unit may use a default temperature value for boost and fuelling calculations while the fault is present.

Symptoms

Engine warning light on
Reduced power or the car going into limp mode
Poor acceleration or hesitation under boost
Slightly higher fuel consumption
Possible black smoke or rough running under load

Possible causes

Faulty charge air cooler temperature sensor (internal short)likely
Signal wire chafed and shorted to earthlikely
Water, oil or corrosion in the sensor connector causing a low signalpossible
Damaged or loose connector terminals at the sensor or control unitpossible
Sensor reference supply (5 V) wiring fault or shared sensor circuit faultpossible
Faulty engine control unitrare

How to diagnose

Read all stored codes and freeze frame data, noting engine temperature, load and intake air temperature when the fault set, and check for other sensor circuit codes
Check live data for the charge air cooler temperature reading with the engine cold; it should be close to ambient and intake air temperature, and a reading stuck very high suggests a short to earth
Inspect the sensor, connector and wiring for chafing, heat damage, oil contamination, moisture and corrosion
Unplug the sensor with the ignition on and watch the live reading; a change to a default or very low or high value helps separate a sensor fault from a wiring fault
Measure the sensor resistance and compare it with the manufacturer's temperature-resistance data for that engine
Check the wiring for continuity and for a short to earth between the sensor and control unit, following the model-specific wiring diagram
Check the reference voltage and earth at the connector; the sensor layout and circuit details vary by model and engine
Clear the code and road test, rechecking live data to confirm the fix

How to fix

Replace the charge air cooler temperature sensor if its resistance or readings are out of specification
Repair or replace chafed or shorted wiring, securing the loom away from sharp edges and heat
Clean or repair corroded connectors, or replace damaged terminals or the connector and dry out any moisture
Fix any fault in the shared reference supply or earth circuit
Only after all other causes are ruled out, diagnose and replace the engine control unit, or update its software if the manufacturer lists an update as a known remedy

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but power may be reduced and fuelling may be less accurate. Get it diagnosed soon and avoid heavy load or towing until it is fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.