P2492EGR Cooler Bypass Position Sensor Circuit (Bank 1)
- 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
- The position sensor tells the controller where the bank 1 cooler bypass flap actually is; position-controlled flaps cannot be regulated without it. P2492 is the general circuit code for that sensor, used when the fault cannot be classed as a short to ground or to the supply. No manufacturer documents P2492 publicly. GM's Duramax tables from 2017 and 2018 monitor the same analog sensor, but split the electrical faults into P2494 (below 1 % of the 5 V reference) and P2495 (above 99 %), both Type B; a separate learning check at key-off is P24C4. Without a valid feedback signal the controller usually stops closed-loop flap control, which can then also set P245B. Damaged wiring, a loose connector or a lost 5 V reference are the main suspects.
- What you may notice
- Check engine light on
- Bypass flap no longer position-controlled
- Likely causes
- LikelyDamaged sensor wiring near hot exhaust parts
- PossibleLoose or corroded connector at the bypass valve
- Rare5 V sensor supply missing or shared circuit shorted
- 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: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.