P2423 on the 2011 Nissan Altima
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| R1720 2010-12 Al | 2020-04-09. Service bulletin. Non-Methane Organic Gases (NMOG) Engine Control Module (ECM) Reprogram Voluntary Emission Recall Campaign ***** Campaign Summary ***** Nissan is conducting a Voluntary Emissions Recall Campaign on approximately 116,479 specific MY2010-12 Altima 2.5L SULEV vehicles identified in Service Comm to reprogram the Engine Control Module (ECM) to assure compliance with the applicable United States SULEV emission specifications. The subject vehicles may be equipped with an improperly calibrated ECM that, if not repaired, may potentially cause exhaust gas emissions to exceed standards at high mileage. This incident has no effect on safety, performance, drivability or fuel consumption. In addition to reprogramming the ECM, Nissan is also extending the emission warranty coverage on the front exhaust tube in the unlikely event that Diagnostic Trouble Code (DTC) P2423 is present, to the following: *All other warranty terms remain the same. ***** What Dealers Should Do**** 1. Verify campaign applicability using Service Comm or DBS National Service History – Open Campaign I.D. R1720. 2. Dealers should use NTB20-022 to remedy any vehicles subject to this campaign. 3. Once repaired, dealers should submit the claim, using the claims coding provided, and release the vehicle. 4. For verification of warranty extension coverage, refer to the extended warranties section in Service Comm or DBS National service history. Coverage will be identified as: L32 NMOG EXT_DTC P2423 NTB20-020. |
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| NTB20-020 | 2020-04-08. Service bulletin. 2010-2012 ALTIMA; MIL ON WITH DTC P2423 NOTE: The warranty period for the front exhaust tube with catalyst (20010-ZX10A) has been extended on the Applied Vehicles if the following criteria are met: • - The MIL is ON and DTC P2423 is stored in the ECM. • - The VIN is shown in SERVICE-COMM under “L32 NMOG EXT_DTC P2423 NTB20-020.” • - The vehicle is within the L32 NMOG Warranty Extension period (refer to Table 1). IF YOU CONFIRM The MIL is ON and DTC P2423 (HC ADSORPTION CATALYST FUNCTION) is stored in the ECM, AND The vehicle is within the L32 NMOG Warranty Extension period, AND L32 NMOG EXT_DTC P2423 NTB20-020 appears in SERVICE-COMM for the vehicle. ACTION Replace the front exhaust tube with catalyst. |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.