Powertrain Fuel & Air Diagnostic Trouble Codes
Complete list of Powertrain fuel-air DTC codes with free diagnostic guides.
Below you'll find every known DTC code for the Powertrain Fuel & Air subsystem with step-by-step diagnostic and repair instructions. 36 guides are available — covering causes, symptoms, and repair costs. Use the table to find your specific code, or browse our full Powertrain DTC code library for other subsystems.
DTC Code Meaning Severity Time
P0030 The engine control module has detected a problem with the heater circuit for the... medium 30-60 minutes P0056 The engine control module has detected a problem with the heater circuit for the... medium 30-60 minutes P0100 The engine control module is telling you that the signal from the Mass Air Flow ... medium 30-60 minutes P0101 The P0101 code indicates that the engine control module (ECM) has detected an ab... medium 30-60 minutes P0102 The engine computer sees a voltage that is too low coming from the mass‑air‑flow... medium 30‑60 minutes P0103 The engine control module is seeing a voltage signal from the mass‑air‑flow sens... medium 30-60 minutes P0106 The engine control module (ECM) is seeing a voltage signal from the MAP (Manifol... medium 30‑60 minutes P0107 The engine control module is seeing a voltage that is lower than the minimum it ... medium 30-60 minutes P0110 The engine control module is telling you that the signal from the intake‑air‑tem... medium 30-60 minutes P0113 The engine control module sees a voltage that is higher than the calibrated rang... medium 30-60 minutes P0120 The engine control module (ECM) isn’t receiving a valid signal from the throttle... medium 30-60 minutes P0121 The engine control module is telling you that the signal from the throttle‑posit... medium 30-60 minutes P0122 The engine control module (ECM) sees a voltage that is too low from the Throttle... medium 30-60 minutes P0125 The engine control module (ECM) is telling you that the coolant temperature is l... medium 30-60 minutes P0128 The P0128 code indicates that the engine control module (ECM) has detected that ... medium 30-60 minutes P0130 The engine control module is telling you that the upstream oxygen sensor on bank... medium 30-60 minutes P0131 The engine control module sees a voltage that is too low from the upstream oxyge... medium 30-60 minutes P0135 The P0135 code indicates a problem with the oxygen sensor heater circuit in bank... medium 30-60 minutes P0136 The P0136 code indicates a problem with the oxygen sensor circuit in Bank 1, Sen... medium 30-60 minutes P0137 The ECM sees a voltage that’s too low from the downstream oxygen sensor on bank ... medium 30-60 minutes P0138 The engine control module is seeing a voltage that is too high from the downstre... medium 30-60 minutes P0141 The engine control module (ECM) tried to power the heater inside the downstream ... medium 30-60 minutes P0155 The P0155 code indicates a problem with the oxygen sensor heater circuit in bank... medium 30-60 minutes P0157 The engine control module detects a voltage that is too low from the downstream ... medium 30-60 minutes P0158 The engine control module sees an unusually high voltage from the downstream oxy... medium 30-60 minutes P0161 The engine control module detects a problem in the heater circuit for the downst... medium 30-60 minutes P0171 The P0171 code indicates that the engine control module (ECM) has detected a lea... medium 30-60 minutes P0172 The P0172 code indicates that the engine control module (ECM) has detected a ric... medium 30-60 minutes P0174 The P0174 code indicates that the engine control module (ECM) has detected a lea... medium 30-60 minutes P0175 The P0175 code indicates that your engine control module (ECM) has detected a ri... medium 30-60 minutes P1101 The engine control module has detected that the intake airflow system is not del... medium 30-60 minutes P1135 The P1135 code indicates a problem with the heater circuit of the air/fuel ratio... medium 30-60 minutes P2015 The P2015 code indicates that the engine control module (ECM) has detected an is... medium 30-60 minutes SYMPTOM-BAD-GAS-MILEAGE The SYMPTOM-BAD-GAS-MILEAGE code indicates that your vehicle's fuel economy has ... medium 30-60 minutes SYMPTOM-BLACK-SMOKE The engine is delivering more fuel than air, creating a fuel‑rich mixture that b... medium 30-60 minutes SYMPTOM-HARD-START The SYMPTOM-HARD-START code tells the powertrain control module that the engine ... medium 30-60 minutes About Powertrain Fuel & Air Trouble Codes
Powertrain fuel-air diagnostic trouble codes are triggered when the vehicle's onboard computer detects a malfunction in the fuel-air subsystem. These codes help you quickly identify the problem without visiting a dealership. Our guides walk you through each DTC code with step-by-step diagnostic procedures, tools needed, and when to call a professional mechanic.