Powertrain, generic (extended)

P2EA5 Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 6

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2EA5 is the plausibility fault of the sixth bank 1 exhaust probe: the voltage is electrically valid, yet the temperature does not match what the exhaust is doing. California's rule 13 CCR 1968.2, section (e)(15.2.1), like §1971.1 for heavy-duty engines, asks for two-sided rationality checks and names exhaust temperature sensors that steer a catalyst temperature strategy. No manufacturer publishes P2EA5. GM's 2025 diesel check for probe 5 (P2483) shows the method: after more than 10,800 s engine off, the value frozen at key-on is the reference, and if the probe then rises less than a calibrated map expects, it is judged stuck or out of the gas stream. Typical causes are a probe pulled from its boss, soot-coated or drifting elements, or two probes swapped at their plugs.

Likely causes

Probe loose or pulled from its boss after exhaust work
Drifting element or soot-coated tip reacting too slowly
Neighbouring probes swapped at their connectors
Contact resistance in the connector shifting the reading

Symptoms

  • Check engine lamp after two trips
  • Probe 6 stays flat or lags while other probes heat up
  • Regeneration interrupted or not started

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–500
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

P2EA1P2EA2P2EA3P2483

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