Powertrain, generic (extended)

P2472 Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 1 Sensor 4)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2472 reports that the last bank 1 temperature probe (sensor 4) changes its signal too abruptly between two readings, although each reading on its own lies in range. GM documents it as a quick-change monitor with a 100 ms task: the 2017 and 2018 diesel tables look at the resistance step between consecutive samples (more than 10 Ω) and fail after 15 of 30 samples, the 2025 tables use a temperature step above 100 °C with 12 of 25 samples; all are Type B, so the MIL waits for a second trip. Stellantis case S2625000003 names it next to P2470 and P2471 for the 2025 and 2026 heavy-duty Ram pickups. Ford's diesel summaries do not use this number. Corroded pins, loose terminals and fatigued wires near the hot pipe cause most cases. A probe that is steady but wrong is P246F.

Likely causes

Loose or corroded terminal in the probe connector
Wire fatigue near the hot exhaust pipe
Cracked sensing element giving unstable contact

Symptoms

  • MIL on after the second faulty trip
  • Temperature value flickers in live data
  • Fault comes and goes, often after rough roads

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–350
Time0.3–2 h

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

Parts involved

egt sensor b1s4egt wiring

Related codes

P2470P2471P246EP246FP242EP2477

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.