Crankshaft/Camshaft Correlation
P0016 means the engine controller may be seeing the crankshaft and camshaft position signals out of the expected relationship.
Article vehicle: 2022 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guideVehicle diagnostics
2020-2025 Chevrolet Silverado 2500 6.6 diesel
System overviews and published DTC guides for this vehicle family.
52 ready guides
Current article source coverage is 2022 Chevrolet Silverado 2500 6.6 diesel. Confirm the vehicle configuration before applying any diagnostic procedure.
Start here
System overviews
Engine timing and position system
Engine Timing System Overview
Learn how crankshaft and camshaft position sensing, correlation, and variation learn work on the 2020-2025 Chevrolet Silverado 2500 6.6 Diesel.
Exhaust gas recirculation system
EGR System Overview
Learn how the EGR valve, position feedback, cooled gas path, airflow response, and P0401/P0403/P0404/P0405 diagnostic categories work on the 2020-2025 Chevrolet Silverado 2500 6.6L Diesel.
Diesel exhaust aftertreatment system
Diesel Aftertreatment Overview
Learn how DPF regeneration, differential-pressure sensing, DEF delivery, SCR conversion, and NOx feedback work on the 2020-2025 Chevrolet Silverado 2500 6.6L Diesel.
Diesel fuel system
Diesel Fuel System Overview
Understand fuel supply, filtration, rail-pressure control, sensor feedback, injector operation, and diagnostic strategy on the 2020-2025 Silverado 2500 6.6L Diesel.
Ambient Air Temperature Signal
P0072 may indicate the ECM is seeing the ambient air temperature signal as not plausible or outside expected behavior.
Article vehicle: 2022 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Fuel Rail Pressure Too Low
P0087 may indicate that fuel rail pressure is lower than expected for the operating condition being monitored.
Article vehicle: 2022 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Turbocharger Overboost
P0234 may indicate the engine control system has detected turbocharger boost higher than expected.
Article vehicle: 2022 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Crankshaft Position Signal Performance
P0336 may indicate that the ECM is seeing a crankshaft position signal that can be out of sync, irregular, or not believable for engine position.
Article vehicle: 2022 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Mass Air Flow Sensor Performance
P0101 often means the engine controller may see a mass air flow reading that does not match the airflow it expects from other engine inputs.
Article vehicle: 2022 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0300 Diagnostic Guide
P0300 may mean the control module is detecting crankshaft speed variation that can indicate a general or random engine misfire.
Article vehicle: 2020 25 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Intake Air Temperature Sensor 1 Circuit High Voltage
P0113 may mean the control module is seeing the intake air temperature signal as a high-voltage condition, which can often look like an unrealistically cold intake air reading.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Engine Coolant Temperature Below Thermostat Regulating Temperature
P0128 often means the engine coolant temperature may be lower than the control module expects for thermostat regulation, or the temperature signal may not be believable.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0171 Diagnostic Guide
P0171 may indicate the fuel trim correction has moved too far in the lean direction for the controller to compensate.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0191 Diagnostic Guide
P0191 may mean the engine controller is seeing a fuel rail pressure sensor performance problem, often because the pressure readings do not agree the way the controller expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0201 Diagnostic Guide
P0201 may mean the engine control module is seeing a possible problem with the cylinder 1 fuel injector control circuit.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Crankshaft Position System Variation Not Learned
P0315 may mean the engine control module does not have the crankshaft position variation learn value stored.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Crankshaft Position Signal Performance
P0335 may mean the engine control module is not receiving the crankshaft position signal it expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Camshaft Position Sensor Circuit
This code generally means the engine control module may not be receiving the camshaft position sensor signal it expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Wait to Start Indicator Control Circuit
P0381 may mean the ECM commanded the wait to start indicator, but the circuit response may not match the commanded state.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Exhaust Gas Recirculation Flow Insufficient
P0401 means the engine computer may be seeing less EGR flow response than expected when it commands EGR operation.
Article vehicle: 2020 25 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Exhaust Gas Recirculation Control Circuit
P0403 generally means the vehicle may be detecting an electrical control problem in the EGR valve circuit rather than a basic flow or soot concern by itself.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Exhaust Gas Recirculation Open Position Performance
P0404 means the EGR valve position may not be matching what the engine control module expects when it commands the valve.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Exhaust Gas Recirculation Open Position Performance
P0404 may mean the control module is commanding EGR valve movement, but the measured EGR position may not match the desired position as expected.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0405 Diagnostic Guide
P0405 usually means the controller may be seeing the EGR position feedback lower than expected.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Exhaust Gas Temperature Sensor Circuit Low Voltage
P0545 may indicate the engine control module is seeing an exhaust gas temperature sensor circuit signal that is lower than expected or outside the usable range.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Transmission Control Module Requested MIL Illumination
P0700 often means the transmission control module may have detected an emissions-related transmission fault and requested the malfunction indicator lamp through the vehicle network
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Torque Converter Clutch System Stuck Off
P0741 may mean the transmission control system is not seeing the torque converter clutch apply or hold as expected.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
reductant pressure sensor reference circuit fault
P10C9 may indicate a reference voltage problem in the reductant pressure sensor circuit used by the diesel exhaust fluid system.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Reductant Heater 1 Control Circuit Shorted to Control Circuit
P10D9 may mean the DEF reductant heater control circuit is seeing a possible circuit-to-circuit fault.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P115E Diagnostic Guide
P115E may indicate that NOx Sensor 1 is not operating within the range the control module expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P119D Diagnostic Guide
P119D may indicate the downstream NOx Sensor 2 signal is not matching the range the control system expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P2002 Diagnostic Guide
P2002 may indicate that the diesel particulate filter is not reducing soot as efficiently as expected.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P20E8 Diagnostic Guide
P20E8 may indicate the reductant pressure is lower than expected in the diesel exhaust fluid aftertreatment system.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P20EE Diagnostic Guide
P20EE may mean the SCR NOx catalyst efficiency is being judged lower than expected by the engine control system.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Particulate Filter Regeneration Frequency
P2459 may mean the diesel particulate filter regeneration frequency is not matching what the control module expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P24A0 Diagnostic Guide
P24A0 may indicate the closed loop particulate filter regeneration temperature control is at its limit on the low-temperature side.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Idle Speed High
P0507 may mean the engine is idling higher than the control module is requesting.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0521 Diagnostic Guide
P0521 may mean the engine control module is seeing an engine oil pressure value that does not agree with the pressure value it expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Voltage Low
P0562 may mean a control module is seeing system voltage lower than expected.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0601 Diagnostic Guide
P0601 may mean a control module has detected a possible internal memory integrity problem.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0601 Diagnostic Guide
P0601 may indicate that the control module has detected a problem with its internal calibration memory self-check.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0601 Diagnostic Guide
P0601 may indicate a possible internal integrity problem in the engine or powertrain control module.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0601 Diagnostic Guide
P0601 may indicate an internal memory or processor performance concern inside the transmission control module, and it can also be associated with programming-related module issues.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P0741 Diagnostic Guide
P0741 may mean the control module is seeing torque converter clutch slip when the clutch is expected to be applied.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Torque Converter Clutch System
P0741 may mean the torque converter clutch is not operating the way the transmission control system expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Message Counter Incorrect
P1000 may indicate that a control module is seeing a serial data message counter that does not match the expected communication sequence.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Diesel Particulate Filter High Temperature
P200C may indicate the diesel particulate filter is getting hotter than expected, or that the aftertreatment temperature information is leading the control module to see a high DPF
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
reductant pressure feedback performance
P204B generally means the reductant pressure feedback may not be matching what the reductant control module expects.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P205B Diagnostic Guide
P205B may indicate that the reductant tank temperature sensor signal is not behaving as expected for the reductant control system.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P2201 Diagnostic Guide
P2201 may indicate that NOx Sensor 1 is reporting outside the expected performance range for the upstream NOx sensing position.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
NOx Sensor 2 Performance
P229F may mean the downstream NOx sensor is reporting a value the engine control module does not expect.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
Particulate Filter Low Differential Pressure
P244A may mean the control module is seeing lower than expected differential pressure across the diesel particulate filter.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P2452 Diagnostic Guide
P2452 may indicate the diesel particulate filter differential pressure sensor signal is outside the range the ECM expects for the current operating state.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P2463 Diagnostic Guide
P2463 may indicate that the control module is seeing diesel particulate filter soot accumulation outside the expected range.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide
P2599 Diagnostic Guide
P2599 may indicate that the turbocharger vane position is not matching the position the engine control module is requesting.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
Read diagnostic guide