Powertrain, generic (extended)

P2480 Exhaust Gas Temperature Sensor Circuit/Open (Bank 1 Sensor 5)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2480 is the general circuit or open-circuit fault of a fifth exhaust temperature probe on bank 1. Five probes in one line are rare; GM's small diesels with oxidation catalyst, SCR, second catalyst and filter are among the few layouts that use them. GM does not report P2480 there, however: its 2018 tables detect an interrupted probe 5 inside P2482, by a resistance above 1400 Ω with the output energised, and the 2025 tables treat values beyond 100 MΩ the same way. So no maker documents P2480 publicly; CARB only requires that the circuit be monitored. Typical findings would be a broken lead, a corroded plug near the hot exhaust, or a probe whose element has burned through. Low and High faults of the same probe are P2481 and P2482.

Likely causes

Broken or chafed lead to probe 5
Corroded or loose connector near the exhaust
Measuring element of the probe burned through

Symptoms

  • Warning lamp on
  • Missing or frozen value for probe 5 in live data
  • Filter regeneration may be suppressed

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–350
Time0.5–2 h

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

Parts involved

egt sensor b1s5egt wiring

Related codes

P2481P2482P2483P2484P2485

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