OBD-II Code
P2084
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$110–$510
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P2084 is the Bank 2 EGT 1 rationality fault and only appears on V-engine diesels with banked exhaust temperature monitoring upstream of each turbo or DOC.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP2084 is the Bank 2 EGT 1 rationality fault and only appears on V-engine diesels with banked exhaust temperature monitoring upstream of each turbo or…
P2084 is the Bank 2 EGT 1 rationality fault and only appears on V-engine diesels with banked exhaust temperature monitoring upstream of each turbo or DOC.
Cheapest-first ladder
- with the engine off and cold-soaked overnight, EGT 1 Bank 1 and EGT 1 Bank 2 must read within 15 C of each other and within 10 C of IAT; any larger spread points to one sensor or one harness leg.
- Warm idle should show both banks within 40 C of each other, and a balanced cruise should hold them within 50 C. If Bank 2 lags Bank 1 by more than 60 C under steady cruise, suspect a Bank 2 injector underfueling before condemning the sensor.
- Caveat: many V8 diesels route the Bank 2 EGT harness directly over the turbo Y-pipe, and the insulation degrades in 60,000 to 80,000 miles.
Vehicle-specific patterns2008 to 2010 Ford 6.4L Powerstroke fail Bank 2 EGT 11 from heat damage near the up-pipe; 2011 to 2016 Duramax LML 2500/3500HD set P2084 when the pass…
- 2008to 2010 Ford 6.4L Powerstroke fail Bank 2 EGT 11 from heat damage near the up-pipe;
- 2011to 2016 Duramax LML 2500/3500HD set P2084 when the passenger-side EGT 1 sensor connector backs out from vibration;
- 2011to 2019 Ford 6.7L Powerstroke set the code from Bank 2 EGT sensor failure during the first regen cycle after a cold soak below -10 C;
- 2007to 2012 Mercedes ML320/350 BlueTEC OM642 set P2084 from the right-bank EGT sensor cracking inside its housing.
Estimated repair$110 to $510.
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