P2488Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 5)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2488 is the rationality check for the fifth bank 2 exhaust probe: the signal is electrically valid but does not follow the operating state. No manufacturer documents P2488; a second bank with five probes is unknown in public maker material. GM's 2025 diesel tables show for bank 1 probe 5 (P2483) how such a check can work: after a soak of more than three hours the key-on value is frozen, and too small a rise during the following drive marks the probe as stuck or outside the gas stream, Type B. CARB requires rationality monitoring of inputs used by the OBD system. A comparison with the matching probe on bank 1 and with the neighbouring probes on bank 2 quickly shows whether one sensor lags behind.
- What you may notice
- Warning lamp after two trips
- Regeneration may be inhibited
- Likely causes
- LikelyAged probe responding too slowly
- PossibleProbe not reaching into the gas flow
- RareExhaust leak cooling the measuring point
- 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 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.