P2484Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 1 Sensor 5)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2484 catches a fifth bank 1 exhaust probe whose signal jumps faster than any real exhaust temperature can change. GM's diesel ECMs compare consecutive samples taken every 100 ms. In the 2018 table the resistance difference between two samples is evaluated, and 15 failed samples out of 30 set a Type B code. The 2025 table uses a temperature step above 100 °C, needs 12 of 25 samples and runs only while the unfiltered value lies between 140 and 1070 °C and no electrical fault of the probe is present. GM lists internal probe faults, worn harnesses and connector problems as failure modes. Unlike P2481 and P2482, the signal stays within its limits, so wiggle tests on the harness while watching live data are the quickest way in.
- What you may notice
- Warning lamp, sometimes going out again
- Erratic jumps of probe 5 in live data
- Likely causes
- LikelyIntermittent contact in the probe connector
- PossibleHarness insulation worn by heat or rubbing
- PossibleProbe element cracking internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.