P2493EGR Cooler Bypass Position Sensor Range/Performance (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
- P2493 is a plausibility fault: the bank 1 bypass position signal stays inside its electrical limits, but its value or behaviour does not fit the commanded flap position or the learned end stops. GM names the code in preliminary bulletin PI1449 for the 2015 Silverado and Sierra with the LML Duramax, where it showed up together with P2495, P24C4 and P06A3. The fix there was a complete new bypass valve, since the sensor sits in the valve and must not be taken apart. Range errors often come from a worn sensor track, a shaft that turns without the sensor following, or deposits that shift the end positions. The pure circuit faults are P2492, P2494 and P2495; bank 2 reports P2498.
- What you may notice
- Check engine light on, often with further bypass codes
- Bypass position in the live data does not match the command
- Likely causes
- LikelyWorn or defective bypass valve with integrated sensor
- PossibleDeposits shifting the learned end positions
- RareUnstable 5 V reference shared with other sensors
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.