DTC Reference for ECU Tuning

Diagnostic trouble code reference for tuning professionals. Understanding which DTCs can appear after ECU modifications — and when proper calibration can address them.

417

DTC Codes

26

System Categories

700+

ECU Platforms

81+

Vehicle Brands

Most Common DTCs After ECU Tuning

P0420Moderate Impact

Catalyst System Efficiency Below Threshold (Bank 1)

Catalyst / Exhaust

12+ brands12+ ECUs10 services
P2002Moderate Impact

Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

DPF / Exhaust

12+ brands12+ ECUs7 services
P0299Moderate Impact

Turbocharger/Supercharger Underboost Condition

Turbo / Boost

12+ brands12+ ECUs10 services
P0430Moderate Impact

Catalyst System Efficiency Below Threshold (Bank 2)

Catalyst / Exhaust

12+ brands12+ ECUs9 services
P0234High Impact

Turbocharger/Supercharger Overboost Condition

Turbo / Boost

12+ brands12+ ECUs10 services
P2015Low Impact

Intake Manifold Runner Position Sensor Range/Performance (Bank 1)

Intake / Swirl Flaps

9+ brands12+ ECUs10 services
P2453Moderate Impact

Diesel Particulate Filter Differential Pressure Sensor Circuit Range/Performance

DPF / Exhaust

12+ brands12+ ECUs10 services
P0101Moderate Impact

Mass Air Flow (MAF) Sensor Range/Performance

Intake / MAF

12+ brands12+ ECUs9 services
P0141Low Impact

O2 Sensor Heater Circuit (Bank 1 Sensor 2)

O2 Sensor

12+ brands12+ ECUs7 services
P0401Low Impact

Exhaust Gas Recirculation (EGR) Flow Insufficient

EGR / Emissions

12+ brands12+ ECUs9 services
P0036Low Impact

HO2S Heater Control Circuit (Bank 1 Sensor 2)

O2 Sensor

12+ brands12+ ECUs10 services
P0403Low Impact

Exhaust Gas Recirculation (EGR) Control Circuit

EGR / Emissions

12+ brands12+ ECUs8 services

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