Trouble codes › By vehicle › Ram 2500 and 3500
Common check-engine codes on the Ram 2500 and 3500
2010-2025
Ram's heavy-duty pickups come with the 6.7L Cummins diesel or a gas Hemi (5.7L through 2013, 6.4L from 2014). On the diesel, most check-engine codes come from the emissions equipment (particulate filter, DEF and EGR), the turbo and the fuel system, including the high-pressure fuel pump recall on 2019-2020 trucks. On the 6.4L Hemi, a tick with a misfire points to lifter and camshaft wear.
Most common: P0087, P2463, P2002, P20EE, P0401, P0299, P0300, P0420.
Known problems on the Ram 2500 and 3500
P0087 Fuel Rail/System Pressure - Too Low
P0087 means fuel rail pressure is lower than the engine computer commanded, from a weak pump, clogged filter or failing high-pressure pump.
On the Ram 2500 and 3500: On 2019-2020 6.7L Cummins trucks, the Bosch CP4 high-pressure pump can fail inside and send metal through the fuel system, which can stall the engine. Recall 21V-880 (Ram Y78) replaces the pump and updates the software: check your VIN. On 2010-2018 trucks (CP3 pump), low rail pressure is more often clogged fuel filters (there are two), the lift pump or the pressure relief valve.
P0087: causes, can I keep driving, and what to check first →
P2463 Diesel Particulate Filter Restriction - Soot Accumulation (Bank 1)
P2463 means the diesel particulate filter (DPF) is clogged with soot that normal regeneration hasn't cleared.
On the Ram 2500 and 3500: Soot loading in the diesel particulate filter. Short trips and long idling keep the exhaust too cool for the filter to clean itself. Check the DPF pressure sensor and its hoses first (a cheap, common culprit) and ask the dealer about software updates before paying for a filter.
P2463: causes, can I keep driving, and what to check first →
P2002 Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
P2002 means the diesel particulate filter (DPF) isn't trapping soot as well as it should, often a damaged filter or a bad pressure sensor.
On the Ram 2500 and 3500: Particulate filter efficiency: often comes with soot-loading codes. A failed pressure sensor or cracked sensor hose can set it, as can a damaged filter; rule out the sensor side first.
P2002: causes, can I keep driving, and what to check first →
P20EE SCR NOx Catalyst Efficiency Below Threshold (Bank 1)
P20EE means the diesel SCR (DEF) system isn't cutting NOx enough, often from bad DEF, a NOx sensor or software needing an update.
On the Ram 2500 and 3500: The DEF (SCR) system isn't cutting NOx enough: old or contaminated DEF, a failing NOx sensor, a clogged DEF injector, or an exhaust leak ahead of the sensors. Ignoring it leads to the reduced-speed countdown.
P20EE: causes, can I keep driving, and what to check first →
P0401 Exhaust Gas Recirculation "A" Flow Insufficient Detected
P0401 means the EGR system isn't flowing enough exhaust back into the intake, usually from carbon-clogged passages or a stuck valve.
On the Ram 2500 and 3500: EGR flow on the Cummins: soot builds up in the EGR valve and cooler, worse with idling and short trips. A cracked EGR cooler also loses coolant, so watch the coolant level and for white smoke.
P0401: causes, can I keep driving, and what to check first →
P0299 Turbocharger/Supercharger "A" Underboost Condition
P0299 means the turbo or supercharger isn't making the boost the engine asked for, most often from a boost leak.
On the Ram 2500 and 3500: Underboost on the Cummins: soot can make the variable-geometry turbo's vanes stick or its actuator fail, and boost leaks at the intercooler pipes and boots are common. Check for leaks under boost before the turbo.
P0299: causes, can I keep driving, and what to check first →
P0300 Random/Multiple Cylinder Misfire Detected
P0300 means the engine is misfiring in more than one cylinder, often from worn plugs or coils, a vacuum leak or low fuel pressure.
On the Ram 2500 and 3500: On the 6.4L Hemi, a misfire with a ticking noise is a well-known sign of lifter and camshaft wear. Rule out plugs and coils first (two plugs per cylinder), and check the oil for metal before replacing only ignition parts.
P0300: causes, can I keep driving, and what to check first →
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0420 means the catalytic converter on bank 1 isn't cleaning the exhaust well enough, usually a worn converter, an exhaust leak or a lazy oxygen sensor.
On the Ram 2500 and 3500: On the gas Hemis: check for exhaust manifold leaks (broken manifold bolts are common) and misfires before replacing a catalytic converter.
P0420: causes, can I keep driving, and what to check first →
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Common codes and known problems as widely reported for these model years; your vehicle may differ. Check nhtsa.gov/recalls and ask a dealer about service bulletins for your VIN, and confirm in your service information.