P00A4: Charge Air Cooler Temperature Sensor Circuit Intermittent/Erratic Bank 2
Standardized SAE J2012 code · P00xx — Fuel & air metering and auxiliary emission controls
What does P00A4 mean?
The charge air cooler temperature sensor for bank 2 (an NTC thermistor) measures the charge air temperature in the second charge-air path, for example on V engines with two charge air coolers. The engine control module uses it for the air mass calculation, boost control and component protection. For P00A4, the signal jumps faster than a real temperature can change, which typically points to a loose contact. No manufacturer description naming this exact code was found. Bank 2 codes occur only on engines with two separate intake or charge-air paths, one per cylinder bank.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Usually no noticeable symptoms
- Emissions test or readiness check may fail
Common causes
- High Loose contact or wire broken by movement
- Medium Sensor failing intermittently
- Low Interference on the signal wire
Likelihood is a general estimate across vehicles; your make and model may differ.
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Describe your P00A4 problemRelated codes
- P007E Charge Air Cooler Temperature Sensor Circuit Intermittent/Erratic Bank 1
- P00A0 Charge Air Cooler Temperature Sensor Circuit Bank 2
- P00A1 Charge Air Cooler Temperature Sensor Circuit Range/Performance Bank 2
- P00A2 Charge Air Cooler Temperature Sensor Circuit Low Bank 2
- P00A3 Charge Air Cooler Temperature Sensor Circuit High Bank 2