Loose, corroded or damaged connector at the charge air cooler coolant temperature sensor; Chafed, stretched or intermittently open or shorted wiring between the sensor and the control unit; Failing charge air cooler coolant temperature sensor; Air trapped in the charge air cooler coolant circuit, causing unstable readings; Low coolant level or weak circulation from the auxiliary coolant pump in the intercooler circuit; Fault in the engine control unit sensor supply or reference voltage; Internal control unit fault.

P00E2

Charge Air Cooler Coolant Temperature Sensor A Intermittent/Erratic.

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
E2: FaultThe specific fault in that area

What it means

P00E2 means the engine control unit has seen an intermittent or erratic signal from charge air cooler coolant temperature sensor A. This sensor monitors the coolant in a liquid-cooled intercooler circuit. The code sets when the reading jumps, drops out or changes implausibly quickly compared with expected values or other temperature inputs. The exact sensor location and circuit layout depend on the model and engine.

Symptoms

Engine warning light on
Reduced power or limp mode on some vehicles
Poor or inconsistent boost response
Intercooler cooling fan or pump running constantly or behaving oddly
Higher than normal intake air temperatures
Fault that comes and goes, often with bumps or heat

Possible causes

Loose, corroded or damaged connector at the charge air cooler coolant temperature sensorlikely
Chafed, stretched or intermittently open or shorted wiring between the sensor and the control unitlikely
Failing charge air cooler coolant temperature sensorlikely
Air trapped in the charge air cooler coolant circuit, causing unstable readingspossible
Low coolant level or weak circulation from the auxiliary coolant pump in the intercooler circuitpossible
Fault in the engine control unit sensor supply or reference voltagerare
Internal control unit faultrare

How to diagnose

Read all stored codes and freeze frame data to see engine conditions when the fault set, and note any related pump, intake air temperature or boost codes
Check the intercooler coolant level when cold and look for leaks around hoses, the cooler and the pump
Inspect the sensor connector and wiring along its route for damage, heat, rubbing, water ingress or corrosion
Watch the sensor reading on live data while gently wiggling the connector and harness, looking for jumps or dropouts
Compare the sensor reading with other temperature sensors on a cold engine; they should be close to each other
Check the sensor supply voltage, signal and ground at the connector against the manufacturer's data
Test the sensor resistance against the manufacturer's temperature table, if the sensor type allows
Check the intercooler pump operation and bleed the circuit as per the model's procedure

How to fix

Repair or replace damaged wiring and clean or renew faulty connector terminals
Replace the charge air cooler coolant temperature sensor if it reads erratically or is out of specification
Top up and bleed the intercooler coolant circuit using the correct coolant and procedure
Repair coolant leaks and replace a faulty auxiliary coolant pump if circulation is poor
Clear the code after repair and road test to confirm it does not return

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but power may be reduced and intake temperatures may rise. Have it checked soon, and avoid heavy loads or hard driving until it is fixed.

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