6.7L Cummins Diagnostics (2013–present, SCR / DEF)

Ram 2500/3500 (and 3500-5500 cab-chassis), 2013-present — 6.7L Cummins with EGR, DPF and SCR/DEF. CP3 (CP4.2 on 2019-2020 only), electric VGT. The full emissions code set plus fuel, boost and sensor faults.

Common symptoms

Black Smoke Under Load — 6.7 Cummins (SCR / DEF) Diagnostic reference for black smoke under load on 2013-present 6.7L Cummins SCR/DEF trucks.
DEF Warning or Speed Limit Derate — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins SCR/DEF DEF warning and speed-limit derate.
Frequent DPF Regenerations — 6.7 Cummins (SCR / DEF) Diagnostic guide for 6.7 Cummins (SCR/DEF) 2013–present with frequent DPF regenerations.
Hard Start or Long Crank — 6.7 Cummins (SCR / DEF) Diagnostic guide for hard start or long crank on 6.7 Cummins (SCR/DEF) 2013–present.
Loss of Power or Limp Mode — 6.7 Cummins (SCR / DEF) Diagnostic reference for loss of power or limp mode on 2013–present 6.7L Cummins SCR/DEF trucks.
Rough Idle and White Smoke on Cold Start — 6.7 Cummins (SCR / DEF) A concise diagnostic reference for 6.7 Cummins (SCR/DEF) 2013–present showing rough idle and white smoke on cold start. Covers intake air grid heater…

P00AF — Turbocharger/Supercharger Boost Control A Module Performance — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins SCR/DEF 2013-present. Focus on VGT actuator module performance, power/ground/data integrity, and vane/actuator mechanical…
P2047 — Reductant Injector Circuit/Open Bank 1 Unit 1 — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins (SCR/DEF) 2013–present.
P205B — Reductant Tank Temperature Sensor Circuit Range/Performance — 6.7 Cummins (SCR / DEF) Diagnostic reference for P205B on 6.7 Cummins SCR/DEF 2013–present. Focuses on diagnosing the DEF tank temperature sensor circuit range/performance issue…
P20B9 — Reductant Heater A Control Circuit/Open — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins (SCR/DEF) 2013–present.
P20E9 — Reductant Pressure Too High — 6.7 Cummins (SCR / DEF) Diagnostic reference for P20E9 on 6.7L Cummins SCR/DEF 2013–present.
P229F — NOx Sensor Circuit Range/Performance Bank 1 Sensor 2 — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins (SCR/DEF) 2013–present.
P242F — Diesel Particulate Filter Restriction - Ash Accumulation — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins SCR/DEF 2013–present. Focus on confirming ash load service limit and ruling out soot-related restriction before condemning…
P2463 — Diesel Particulate Filter Restriction - Soot Accumulation — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins (SCR/DEF) 2013–present.
P2BAE — NOx Exceedance - NOx Control Monitoring System — 6.7 Cummins (SCR / DEF) Diagnostic reference for P2BAE on 6.7L Cummins SCR/DEF 2013–present.
P203F — Reductant Level Too Low — 6.7 Cummins (SCR / DEF) Diagnostic reference for P203F on 6.7 Cummins SCR/DEF 2013–present. Focus on DEF tank and level sensor.
P226C — Turbocharger/Supercharger Boost Control A Slow Response — 6.7 Cummins (SCR / DEF) Turbocharger/Supercharger Boost Control A Slow Response
P2609 — Intake Air Heater System Performance — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7L Cummins SCR/DEF 2013–present.
P2BAD — NOx Exceedance - Root Cause Unknown — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins (SCR/DEF) 2013–present.
P204F — Reductant System Performance — 6.7 Cummins (SCR / DEF) P204F on 6.7L Cummins SCR/DEF (2013–present) means the ECM has detected the SCR/DEF reductant system is not achieving expected NOx reduction.
P0087 — Fuel Rail/System Pressure Too Low — 6.7 Cummins (SCR / DEF) Measured fuel rail pressure is below the PCM's commanded value on 6.7L Cummins SCR/DEF 2013–present.
P0088 — Fuel Rail/System Pressure Too High — 6.7 Cummins (SCR / DEF) Measured fuel rail pressure is higher than the PCM commanded value on 6.7L Cummins SCR/DEF 2013–present. The system uses a CP3 high-pressure pump for 2013–2018…
P008A — Low Pressure Fuel System Pressure Too Low — 6.7 Cummins (SCR / DEF) Low Pressure Fuel System Pressure Too Low
P0090 — Fuel Pressure Regulator Control Circuit — 6.7 Cummins (SCR / DEF) P0090 is an electrical fault detected by the ECM in the circuit that controls the fuel pressure regulator on 6.7L Cummins SCR/DEF trucks. The platform uses a…
P0128 — Coolant Thermostat Below Regulating Temperature — 6.7 Cummins (SCR / DEF) Engine coolant does not reach the expected operating temperature in the expected time on 6.7L Cummins SCR/DEF 2013–present.
P0201 — Injector Circuit/Open - Cylinder 1 — 6.7 Cummins (SCR / DEF) P0201 on 6.7L Cummins SCR/DEF 2013–present means the ECM has detected an electrical fault in the fuel injector circuit for cylinder 1.
P0234 — Turbocharger/Supercharger Overboost Condition — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7L Cummins SCR/DEF 2013–present.
P0263 — Cylinder 1 Contribution/Balance Fault — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7L Cummins SCR/DEF 2013–present.
P0299 — Turbocharger/Supercharger Underboost Condition — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins SCR/DEF 2013–present. Turbo is Holset HE300VG VGT with electric actuator + position sensor; no wastegate/vacuum/boost…
P0401 — Exhaust Gas Recirculation Flow Insufficient — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7L Cummins SCR/DEF 2013–present.
P0402 — Exhaust Gas Recirculation Flow Excessive — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7L Cummins SCR/DEF 2013–present.
P0420 — Catalyst System Efficiency Below Threshold — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7L Cummins SCR/DEF 2013–present. P0420 is a generic OBD-II catalyst efficiency code that is not used on this platform; the platform…
P042E — Exhaust Gas Recirculation Control Stuck Open — 6.7 Cummins (SCR / DEF) Exhaust Gas Recirculation Control Stuck Open
P0471 — Exhaust Pressure Sensor A Circuit Range/Performance — 6.7 Cummins (SCR / DEF) Exhaust Pressure Sensor A Circuit Range/Performance
P2002 — Diesel Particulate Filter Efficiency Below Threshold (Bank 1) — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins SCR/DEF 2013–present.
P20E8 — Reductant Pressure Too Low — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7L Cummins SCR/DEF 2013–present. P20E8 is a DEF/SCR reductant pressure low code on this platform and is not a fuel-rail pressure…
P20EE — SCR NOx Catalyst Efficiency Below Threshold (Bank 1) — 6.7 Cummins (SCR / DEF) SCR NOx catalyst efficiency below threshold on the 6.7L Cummins SCR/DEF: what P20EE means, likely causes and how to check them.
P2201 — NOx Sensor Circuit Range/Performance Bank 1 Sensor 1 — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7L Cummins SCR/DEF 2013–present. P2201 is a generic oxygen-sensor definition; on this diesel platform the code is used for NOx…
P2262 — Turbocharger Boost Pressure Not Detected — 6.7 Cummins (SCR / DEF) Diagnostic reference for 6.7 Cummins SCR/DEF 2013–present. Turbo is Holset HE300VG VGT with electric actuator + integrated position sensor; no…
P2452 — Diesel Particulate Filter Pressure Sensor A Circuit — 6.7 Cummins (SCR / DEF) P2452 is a generic OBD-II code for a DPF differential-pressure sensor circuit fault on the 6.7L Cummins SCR/DEF platform.
P2459 — Diesel Particulate Filter Regeneration Frequency — 6.7 Cummins (SCR / DEF) P2459 is a generic DPF regeneration frequency monitor code; on the 6.7 Cummins SCR/DEF 2013–present it typically sets when the ECM counts excessive active…