P2484 code meaning
Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 1 Sensor 5)
Powertrain system Generic code P24xx codes Check engine light
What P2484 means
P2484 catches a fifth bank 1 exhaust probe whose signal jumps faster than any real exhaust temperature can change. GM's diesel ECMs compare consecutive samples taken every 100 ms. In the 2018 table the resistance difference between two samples is evaluated, and 15 failed samples out of 30 set a Type B code. The 2025 table uses a temperature step above 100 °C, needs 12 of 25 samples and runs only while the unfiltered value lies between 140 and 1070 °C and no electrical fault of the probe is present. GM lists internal probe faults, worn harnesses and connector problems as failure modes. Unlike P2481 and P2482, the signal stays within its limits, so wiggle tests on the harness while watching live data are the quickest way in.
P2484 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2484
- Warning lamp, sometimes going out again
- Erratic jumps of probe 5 in live data
Common causes of P2484
- Most likelyIntermittent contact in the probe connector
- PossibleHarness insulation worn by heat or rubbing
- PossibleProbe element cracking internally
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Egt sensor b1s5
What each part of P2484 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). |
| 84 | The exact fault in that area. |
What to do next
- Note P2484 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 P2484
What does P2484 mean?
P2484 means "Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 1 Sensor 5)". P2484 catches a fifth bank 1 exhaust probe whose signal jumps faster than any real exhaust temperature can change. It is a generic code, so it means the same on every make.
Is it safe to drive with P2484?
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 P2484 fail an emissions test?
Yes, it can. P2484 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 P2484 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2484 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.