P2AC9

Charge Air Cooler Coolant Temperature Sensor B Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Deteriorating fuel economy
Rough engine idling
Acceleration problems

Causes

Charge air cooler temperature sensor B fault
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Wiring harness damage
Engine control unit malfunction

How to Fix

Check the integrity of the sensor circuit
Inspect the connectors and contacts of the sensor
Check the resistance of the temperature sensor
Replace temperature sensor if necessary
Check and update the engine control unit firmware

Related codes

P2AC8 P2ACA P2ACB