Charge Air Cooler Temperature Sensor Circuit Low Bank 2
The P00A2 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the charge air cooler temperature sensor on Bank 2 that is lower than the expected range. This sensor monitors the temperature of the air entering the intake manifold after the intercooler. A low voltage reading typically suggests a short to ground, a faulty sensor, or wiring issues. This can lead to incorrect air density calculations, affecting fuel trim and ignition timing.
01. Most Common Causes
- Faulty charge air cooler temperature sensor
- Short to ground in sensor circuit
- Open or damaged wiring/connector
- Corroded or loose electrical connections
- ECM internal fault (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Poor fuel economy
- Possible rough idle or hesitation
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the sensor and wiring for damage, corrosion, or loose connections.
Step 3: Measure sensor resistance and compare to manufacturer specs; replace if out of range.
Step 4: Check for short to ground by disconnecting sensor and measuring voltage at harness connector.
Step 5: If wiring and sensor are good, test ECM output or consult a professional for further diagnosis.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but reduced performance and fuel economy may occur. Prolonged driving could cause drivability issues or damage to other components.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the cause. Sensor replacement is usually under $100, while wiring repairs may cost more.