Powertrain, generic (extended)

P2EA1 Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 6

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Corroded or heat-damaged plug of the sixth probe near the exhaust
Probe lead or internal wire broken by exhaust vibration
Harness chafed or melted along the aftertreatment
Faulty input stage or temperature evaluation module

Symptoms

  • Check engine lamp on
  • Particulate filter regeneration delayed or blocked
  • Live data for probe 6 missing or jumping

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–600
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

exhaust gas temp sensor b1 s6wiring harnessecm

Related codes

P2EA2P2EA3P2EA5P2480P2484

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov, hella.com.