P2492 code meaning
EGR Cooler Bypass Position Sensor Circuit (Bank 1)
Powertrain system Generic code P24xx codes Check engine light
What P2492 means
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.
P2492 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P2492
- Check engine light on
- Bypass flap no longer position-controlled
Common causes of P2492
- Most likelyDamaged sensor wiring near hot exhaust parts
- PossibleLoose or corroded connector at the bypass valve
- Less likely5 V sensor supply missing or shared circuit shorted
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR cooler bypass position sensor b1
What each part of P2492 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 92 | The exact fault in that area. |
What to do next
- Note P2492 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2492
What does P2492 mean?
P2492 means "EGR Cooler Bypass Position Sensor Circuit (Bank 1)". The position sensor tells the controller where the bank 1 cooler bypass flap actually is; position-controlled flaps cannot be regulated without it. It is a generic code, so it means the same on every make.
Is it safe to drive with P2492?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2492 fail an emissions test?
Yes, it can. P2492 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2492 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2492 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.