Diagnostics
OBD-II Code Lookup
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P0087serious
Fuel Rail Pressure Too Low
- Failing CP pump
- Restricted fuel filter
- Leaking injector
- Weak lift pump
P0088serious
Fuel Rail Pressure Too High
- Stuck fuel pressure regulator
- FRP sensor fault
- Wiring short
P0101watch
MAF Sensor Range/Performance
- Dirty MAF
- Intake leak
- Restricted air filter
P0128watch
Coolant Temp Below Thermostat Regulating Temp
- Stuck-open thermostat
- Failing coolant temp sensor
P0171watch
System Too Lean (Bank 1)
- Vacuum/intake leak
- Weak fuel pump
- Dirty MAF
P0234serious
Turbocharger Overboost
- Stuck wastegate/vanes
- Boost control fault
- Sticking VGT
P0299serious
Turbocharger Underboost
- Boost leak
- Sticking VGT vanes
- Clogged CAC
- Wastegate stuck open
P0300serious
Random/Multiple Cylinder Misfire
- Injector fault
- Low compression
- Fuel delivery
- Glow plug issues
P0401watch
EGR Flow Insufficient
- Clogged EGR cooler/valve
- Carbon buildup
- EGR valve stuck
P0402watch
EGR Flow Excessive
- Stuck-open EGR valve
- DPFE sensor fault
P0420watch
Catalyst Efficiency Below Threshold
- Aged catalyst
- O2 sensor fault
- Exhaust leak
P0470watch
Exhaust Pressure Sensor Fault
- EBP sensor clogged with soot
- Wiring
- Tube blockage
P0488watch
EGR Throttle Position Control Range
- Carboned throttle valve
- Actuator fault
P0540info
Intake Air Heater Circuit
- Grid heater relay
- Wiring
- Heater element
P0606serious
ECM/PCM Processor Fault
- Failing ECM
- Power/ground issue
- Corrosion
P0670watch
Glow Plug Module Control Circuit
- Glow plug module
- Glow plug failure
- Wiring
P1093serious
Fuel Rail Pressure Low During Power
- Weak CP3/CP4
- Air in fuel
- Restricted supply
P2002serious
DPF Efficiency Below Threshold (Bank 1)
- Loaded/cracked DPF
- Pressure sensor fault
- Failed regens
P2262serious
Turbo Boost Pressure Not Detected
- VGT vanes stuck
- Boost leak
- Sensor fault
P2459watch
DPF Regeneration Frequency
- Short trips
- Excess soot
- EGR over-flow
- Boost leak
P2463serious
DPF Soot Accumulation
- Incomplete regens
- Sensor fault
- Excess soot load
P204Fserious
Reductant System Performance
- DEF quality/level
- Dosing fault
- NOx sensor
P207Fserious
Reductant Quality Performance
- Contaminated DEF
- DEF sensor
- Dosing valve
P20E8serious
Reductant Pressure Too Low
- DEF pump fault
- Frozen/clogged lines
- Injector blockage
P0683info
Glow Plug Module to ECM Comm
- Wiring/connector
- GPCM fault
P226Cwatch
Turbo Boost Control 'A' Slow Response
- Carboned VGT
- Actuator fault
- Soot buildup
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