DTC Detection Logic
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Control Module (ECM) calculated the DOC efficiency was less than required to successfully complete a regeneration.
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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P0421-00 |
CATALYST (Warm Up Catalyst Efficiency Below Threshold) |
Diagnosis condition |
Engine is running and active regeneration of the after treatment diesel particulate filter is occurring. |
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Signal (terminal) |
(-) |
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Threshold |
After treatment Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range |
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Diagnosis delay time |
Diagnostic runs continuously when the engine is running and active regeneration of the after treatment diesel particulate filter is occurring. |
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