P055E
Oxygen Sensor Control Module System Voltage
The dedicated O2 sensor control module - found on systems with a wide-band sensor needing its own pumping current driver - reports its supply voltage outside the calibrated window.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
Ordered by how often each turns out to be the cause.
- Supply voltage low or unstableCommon
Parts involved
- Oxygen Sensor Control Module
P055E 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.