P2496EGR Cooler Bypass Position Sensor Circuit Intermittent/Erratic (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
- P2496 targets a bank 1 bypass position signal that jumps, drops out briefly or changes faster than the flap can physically move, without staying outside the electrical limits long enough for P2494 or P2495. No manufacturer documents P2496 publicly; GM's Duramax tables, which do cover the same analog sensor, only list the low, high and learning checks. The fault pattern is typical of loose terminals, a wire that breaks inside its insulation when the engine rocks, moisture creeping into the connector or a worn contact track in the sensor. Because the signal looks fine most of the time, the code may come and go; wiggling the harness while watching live data is the most useful test. CARB treats such sensors as comprehensive components. Bank 2 uses P249B.
- What you may notice
- Check engine light that comes and goes
- Bypass position value jumps in the live data
- Likely causes
- LikelyLoose or spread terminal in the sensor connector
- PossibleWire breaking inside the insulation from engine movement
- RareWorn contact track inside the sensor
- 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: €20 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.