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P21B5
NOx Adsorber - Over Temperature Bank 2
Generic · engine
Data confidence
65%
The control module detected that the NOx Adsorber temperature exceeded its permissible limit.
TuningBot DTC Database · v4.37.15
P21B5 NOx Adsorber - Over Temperature Bank 2
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P21B5 means
Related and nearby codes
How to read P21B5
P
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
1B5
Specific fault index within the subsystem.
Frequently asked questions about P21B5
What does P21B5 mean?
NOx Adsorber - Over Temperature Bank 2. The control module detected that the NOx Adsorber temperature exceeded its permissible limit.
Is P21B5 generic or manufacturer-specific?
P21B5 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P21B5 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: SCR / AdBlue System