P2495 code meaning
EGR Cooler Bypass Position Sensor Circuit High (Bank 1)
Powertrain system Generic code P24xx codes Check engine light
What P2495 means
P2495 covers a bank 1 bypass position signal that climbs close to the reference voltage. On GM Duramax diesels the 2017 calibration fails it above 99 % of 5 V in 200 out of 250 samples, with the same enable conditions as the low test, and rates it Type B. In the field GM saw it on 2015 LML-powered full-size pickups: preliminary bulletin PI1449 lists it with P2493, P24C4 and P06A3 and has the whole bypass valve replaced. That combination is a useful hint: a shared 5 V supply fault (P06A3) can drag several sensors along, so check the reference circuit before condemning parts. Otherwise an open ground wire or a signal wire touching supply is typical. Low voltage is P2494, bank 2 P249A.
P2495 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P2495
- Check engine light after two trips
- Additional sensor supply codes stored at the same time
Common causes of P2495
- Most likelyOpen sensor ground wire
- PossibleDefective bypass valve with integrated sensor
- PossibleFault in the shared 5 V reference circuit
- Less likelySignal wire touching a voltage source
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 P2495 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). |
| 95 | The exact fault in that area. |
What to do next
- Note P2495 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 P2495
What does P2495 mean?
P2495 means "EGR Cooler Bypass Position Sensor Circuit High (Bank 1)". P2495 covers a bank 1 bypass position signal that climbs close to the reference voltage. It is a generic code, so it means the same on every make.
Is it safe to drive with P2495?
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 P2495 fail an emissions test?
Yes, it can. P2495 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 P2495 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2495 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.