P2EA1Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 6
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2EA1 is the general electrical fault of a sixth exhaust temperature probe on bank 1, counting from the engine towards the tailpipe. No manufacturer documents this code publicly: the diesel tables that are published stop at probe 5, which GM's 2025 table 25OBDG04A places behind the particulate filter. GM's logic for that probe hints at the use of a general circuit code: a broken lead appears as more than 100 MΩ and is booked as High, while digital thermocouple modules also watch their communication. P2EA1 thus fits interruptions or contact faults the module cannot assign to one limit. Stellantis warns for the 2025–2026 Ram heavy-duty diesel to go by sensor names, not numbers, when locating a probe. Low and High are P2EA3 and P2EA2.
- What you may notice
- Check engine lamp on
- Particulate filter regeneration delayed or blocked
- Live data for probe 6 missing or jumping
- Likely causes
- LikelyCorroded or heat-damaged plug of the sixth probe near the exhaust
- PossibleProbe lead or internal wire broken by exhaust vibration
- PossibleHarness chafed or melted along the aftertreatment
- RareFaulty input stage or temperature evaluation module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.