Archives: DTC Codes

What Does Code P1151 Mean? The OBD-II diagnostic trouble code P1151, which translates to “Lack Of HO2S21 Switch – Sensor Indicates Lean,” signifies a specific issue detected by the Engine Control Module (ECM) or Powertrain Control Module (PCM) within the vehicle’s fuel management and emissions control systems. HO2S21 refers to Heated Oxygen Sensor (HO2S) located […]

What Does Code P1152 Mean? DTC P1152 stands for “Lack Of HO2S21 Switch – Sensor Indicates Rich.” This code indicates that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected that the Heated Oxygen Sensor on Bank 2, Sensor 1 (HO2S21) is failing to switch adequately between lean and […]

What Does Code P1153 Mean? DTC P1153, which translates to “Bank 2 Fuel Control Shifted Lean,” indicates that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected a persistent lean condition on engine Bank 2. Bank 2 refers to the cylinder bank that does not contain cylinder #1. […]

What Does Code P1154 Mean? DTC P1154, “Bank 2 Fuel Control Shifted Rich,” indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected a persistent rich fuel mixture condition specifically in Bank 2 of the engine. Bank 2 refers to the cylinder bank that does not contain cylinder #1. The PCM […]

What Does Code P1155 Mean? The diagnostic trouble code P1155 signifies an detected fault within the vehicle’s Alternative Fuel Controller (AFC) or its associated circuit. This code is typically specific to vehicles equipped with systems capable of operating on fuels other than conventional gasoline, such as Ethanol (E85), Compressed Natural Gas (CNG), or Liquefied Petroleum […]

What Does Code P1156 Mean? DTC P1156 indicates a malfunction within the Fuel Select Switch (FSS) circuit. This code is most commonly observed in vehicles equipped with dual fuel tanks (e.g., older trucks, SUVs) or aftermarket alternative fuel systems (e.g., LPG, CNG conversions) that utilize a switch to select between different fuel sources. The Powertrain […]

What Does Code P1157 Mean? The OBD-II diagnostic trouble code P1157 signifies “Lack Of HO2S22 Switch – Sensor Indicates Lean.” This code specifically refers to a condition detected by the Engine Control Module (ECM) or Powertrain Control Module (PCM) regarding the Heated Oxygen Sensor 2 on Bank 2 (HO2S22). HO2S22 denotes the downstream oxygen sensor […]

What Does Code P1158 Mean? The diagnostic trouble code P1158 signifies a “Lack Of HO2S22 Switch – Sensor Indicates Rich.” This code is specific to the operation of the Heated Oxygen Sensor (HO2S) located in Bank 2, Sensor 2 (B2S2). Bank 2 refers to the cylinder bank that does not contain cylinder number one, and […]

What Does Code P1159 Mean? The diagnostic trouble code P1159, indicating a “Fuel Stepper Motor Malfunction”, refers to an issue detected by the Engine Control Module (ECM) or Powertrain Control Module (PCM) within the circuit or operation of a specialized stepper motor responsible for precise fuel metering. Unlike conventional solenoid-based fuel injectors, certain sophisticated fuel […]

What Does Code P1167 Mean? DTC P1167 is a manufacturer-specific powertrain code that translates to “Invalid Test, Throttle Not Depressed.” This indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) attempted to initiate a specific diagnostic self-test, but a critical prerequisite condition related to throttle position was not met. Specifically, the ECM […]