Code result
P2BA7
NOx Exceedence - Empty Reagent Tank
High severity
What it means
NOx emissions are above the legal threshold and the ECU isolates the cause to an empty reductant tank. SCR cannot dose AdBlue/DEF.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
DEF/AdBlue tank empty - refill required
highOne of the most commonly reported causes for this code — check this first.
Level sensor reads empty incorrectly
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P2BA7 freeNo credit card required