P0A04
Motor Electronics Coolant Temperature Sensor A Circuit Intermittent
The motor electronics coolant temperature sensor A signal drops out intermittently. Loose connector or noisy ground reference.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Connector not seatedCommon
- Noisy ground referencePossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Motor Electronics Coolant Temp Sensor A
- Wiring Harness
- Hybrid Control Module
P0A04 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.