DTC

DTC code library

Common emission-related fault codes with their meaning, typical causes and the matching NuoVolta solutions.

Mass air flow (MAF)

P0101 Mass or Volume Air Flow (MAF) Circuit Range/Performance P0102 Mass or Volume Air Flow (MAF) Circuit Low Input P0103 Mass or Volume Air Flow (MAF) Circuit High Input

Oxygen (lambda) sensors

P0130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1) P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

Exhaust gas recirculation (EGR)

P0400 Exhaust Gas Recirculation (EGR) Flow Malfunction P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient Detected P0402 Exhaust Gas Recirculation (EGR) Flow Excessive Detected P0403 Exhaust Gas Recirculation (EGR) Control Circuit Malfunction P0404 Exhaust Gas Recirculation (EGR) Circuit Range/Performance P0405 Exhaust Gas Recirculation (EGR) Sensor A Circuit Low P0406 Exhaust Gas Recirculation (EGR) Sensor A Circuit High

Secondary air injection

P0410 Secondary Air Injection System Malfunction

Catalytic converter

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

Evaporative emissions (EVAP)

P0455 Evaporative Emission (EVAP) System Leak Detected (Large Leak)

Exhaust pressure

P0471 Exhaust Pressure Sensor Circuit Range/Performance

Exhaust gas temperature

P0544 Exhaust Gas Temperature (EGT) Sensor Circuit (Bank 1 Sensor 1) P2031 Exhaust Gas Temperature (EGT) Sensor Circuit (Bank 1 Sensor 2) P2080 Exhaust Gas Temperature (EGT) Sensor Circuit Range/Performance (Bank 1 Sensor 1)

Diesel particulate filter (DPF)

P2002 Particulate Filter Efficiency Below Threshold (Bank 1) P242F Diesel Particulate Filter (DPF) Restriction - Ash Accumulation P244A Diesel Particulate Filter (DPF) Differential Pressure Too Low (Bank 1) P244B Diesel Particulate Filter (DPF) Differential Pressure Too High (Bank 1) P2453 Diesel Particulate Filter (DPF) Pressure Sensor A Circuit Range/Performance P2454 Diesel Particulate Filter (DPF) Pressure Sensor A Circuit Low P2455 Diesel Particulate Filter (DPF) Pressure Sensor A Circuit High P2458 Diesel Particulate Filter (DPF) Regeneration Duration P2459 Diesel Particulate Filter (DPF) Regeneration Frequency P2463 Diesel Particulate Filter (DPF) Restriction - Soot Accumulation

Swirl flaps

P2004 Intake Manifold Runner Control Stuck Open (Bank 1) P2008 Intake Manifold Runner Control Circuit/Open (Bank 1) P2015 Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance (Bank 1)

SCR / AdBlue

P203F Reductant (AdBlue/DEF) Level Too Low P2047 Reductant (AdBlue/DEF) Injector Circuit/Open (Bank 1 Unit 1) P20E8 Reductant (AdBlue/DEF) Pressure Too Low P20EE SCR NOx Catalyst Efficiency Below Threshold (Bank 1)

NOx sensors

P2200 NOx Sensor Circuit (Bank 1 Sensor 1) P2201 NOx Sensor Circuit Range/Performance (Bank 1 Sensor 1) P229F NOx Sensor Circuit Range/Performance (Bank 1 Sensor 2) P2BAD NOx Exceedance - Root Cause Unknown

Diagnose and repair real faults first. Removing or disabling emission systems is only permitted where allowed by law, for example for off-road or motorsport use.