P2EA1 code meaning
Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 6
Powertrain system Generic code P2Exx codes Check engine light
What P2EA1 means
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.
P2EA1 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2EA1
- Check engine lamp on
- Particulate filter regeneration delayed or blocked
- Live data for probe 6 missing or jumping
Common causes of P2EA1
- Most 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
- Less likelyFaulty input stage or temperature evaluation module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust gas temp sensor b1 s6Wiring harnessECM
What each part of P2EA1 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A1 | The exact fault in that area. |
What to do next
- Note P2EA1 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2EA1
What does P2EA1 mean?
P2EA1 means "Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 6". P2EA1 is the general electrical fault of a sixth exhaust temperature probe on bank 1, counting from the engine towards the tailpipe. It is a generic code, so it means the same on every make.
Is it safe to drive with P2EA1?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2EA1 fail an emissions test?
Yes, it can. P2EA1 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2EA1 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2EA1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.