P00E2: Charge Air Cooler Coolant Temperature Sensor A Intermittent/Erratic

With indirect charge air cooling, a water-to-air charge air cooler cools the charge air; it sits in a separate low-temperature coolant circuit with an electric pump and its own radiator. The charge air cooler coolant temperature sensor A measures the coolant temperature of this circuit. The control module uses it to control the pump and to monitor cooling performance. Documented users are diesel engines from Ford and GM. P00E2: The signal jumps or drops out briefly, which typically points to a loose contact or a chafed harness.

Symptoms

• Check engine light on
• Reduced power possible
• Often no noticeable symptoms

Most likely causes

• Wiring harness chafed or fuse blown (documented by manufacturer bulletins)
• Sensor faulty
• Connector corroded or water ingress
• Engine control module faulty

What to check, in order

Start with the simplest. You can tick off each step.

1. With the engine cold, check the coolant level; never do this when the system is hot
2. Gently move the wiring with the engine running and watch whether the reading changes.
3. Check the actual temperature in live data
4. Make sure the fan comes on when it should
5. Check the thermostat and connector
6. Measure the sensor and replace it if its readings do not make sense

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P00E2 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 0: Subsystem depends on the code range
• E2: Specific fault in that system

Frequently asked questions

Can I keep driving with code P00E2?

Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

What causes code P00E2?

The most common causes are: wiring harness chafed or fuse blown (documented by manufacturer bulletins); sensor faulty; connector corroded or water ingress.

Related codes

• P00DECharge Air Cooler Coolant Temperature Sensor A Circuit
• P00DFCharge Air Cooler Coolant Temperature Sensor A Circuit Range/Performance
• P00E0Charge Air Cooler Coolant Temperature Sensor A Circuit Low
• P00E1Charge Air Cooler Coolant Temperature Sensor A Circuit High
• P026ACharge Air Cooler Efficiency Below Threshold
• P007BCharge Air Cooler Temperature Sensor Circuit Range/Performance Bank 1

Sources

• law.cornell.edu: 13 CCR 1968.2
• static.nhtsa.gov: MC 10178360 9999
• static.nhtsa.gov: MC 10224856 0001
• static.nhtsa.gov: MC 11014080 0001

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.