What does code P2C79 mean?

Q: What does code P2C79 mean?

NOx Adsorber - Sulfur Limit Exceeded. P2C79 indicates that the engine computer has determined the nitrogen oxide (NOx) adsorber in the exhaust after-treatment system has accumulated more sulfur than it can tolerate, exceeding its designed sulfur limit. The powertrain control module (PCM) monitors the adsorber's efficiency and sets this code when its calculations or sensor feedback show the sulfur loading has crossed the threshold, typically because the required desulfurization regeneration has not occurred or has failed.

DTC codes / P2Cxx · Hybrid propulsion / P2C79

P2C79NOx Adsorber - Sulfur Limit Exceeded

P2C79 indicates that the engine computer has determined the nitrogen oxide (NOx) adsorber in the exhaust after-treatment system has accumulated more sulfur than it can tolerate, exceeding its designed sulfur limit. The powertrain control module (PCM) monitors the adsorber's efficiency and sets this code when its calculations or sensor feedback show the sulfur loading has crossed the threshold, typically because the required desulfurization regeneration has not occurred or has failed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.