Archives: DTC Codes

What Does Code P0163 Mean? DTC P0163 signifies an “O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)” condition. This diagnostic trouble code is set by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it detects that the voltage output from the oxygen sensor located in Bank 2, Sensor 3, consistently remains […]

What Does Code P0164 Mean? DTC P0164 signifies that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected a voltage reading from the Bank 2 Sensor 3 Oxygen (O2) sensor circuit that is consistently higher than its expected operational range. For a typical zirconia-type O2 sensor, normal operating voltage […]

What Does Code P0165 Mean? The OBD-II diagnostic trouble code P0165 signifies “O2 Sensor Circuit Slow Response (Bank 2 Sensor 3).” This code is registered by the Engine Control Module (ECM), sometimes referred to as the Powertrain Control Module (PCM), when it detects that the oxygen sensor located in Bank 2, Sensor 3, is reacting […]

What Does Code P0166 Mean? DTC P0166, an OBD-II diagnostic trouble code, indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected no activity or an abnormal, fixed voltage output from the Oxygen (O2) Sensor located at Bank 2, Sensor 3. To elaborate, “Bank 2” refers to the cylinder bank that […]

What Does Code P0167 Mean? DTC P0167 indicates a malfunction within the heater circuit for the Oxygen (O2) Sensor positioned on Bank 2, Sensor 3. To deconstruct this designation: Bank 2 refers to the engine cylinder bank that does not contain cylinder #1 (often the passenger side on V-configuration engines). Sensor 3 signifies the third […]

What Does Code P0170 Mean? The OBD-II diagnostic trouble code P0170, generically defined as “Fuel Trim Malfunction (Bank 1),” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an anomaly in its ability to maintain the target air-fuel ratio for Bank 1. Unlike more specific fuel trim codes like P0171 […]

What Does Code P0171 Mean? DTC P0171 signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an overly lean air-fuel mixture condition in Bank 1. Bank 1 refers to the side of the engine containing cylinder #1 (on V-type engines) or the single bank on an inline engine. The ECM/PCM […]

What Does Code P0172 Mean? DTC P0172 signifies “Fuel Trim System Too Rich (Bank 1).” This code is registered by the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), when its continuous monitoring of the fuel system indicates an excessively rich air-fuel mixture on Bank 1. Bank 1 refers […]

What Does Code P0173 Mean? DTC P0173 signifies a Fuel Trim Malfunction on Bank 2. The Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), continuously monitors the engine’s air/fuel ratio using input from the upstream (pre-catalytic converter) oxygen sensors (O2S) and the Mass Air Flow (MAF) sensor. To maintain an optimal […]

What Does Code P0174 Mean? DTC P0174 indicates a System Too Lean (Bank 2) condition. This diagnostic trouble code is set by the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), when its adaptive fuel trim system detects that an excessive amount of fuel is required to maintain the ideal […]