Archives: DTC Codes

What Does Code P1136 Mean? DTC P1136 signifies a detected malfunction within the engine cooling fan control circuit. The Engine Control Module (ECM) or Powertrain Control Module (PCM) is designed to monitor the operational integrity of the engine cooling fan circuit. This includes monitoring voltage, current draw, and feedback signals to ensure the fan activates […]

What Does Code P1137 Mean? The diagnostic trouble code P1137 indicates a “Lack Of HO2S Switch – Sensor Indicates Lean” for Bank 1, Sensor 2. This code specifically refers to the heated oxygen sensor (HO2S) located after the catalytic converter on the bank of cylinders that includes cylinder #1. The Engine Control Module (ECM) or […]

What Does Code P1138 Mean? DTC P1138 signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a lack of switching activity from the Heated Oxygen Sensor 1, Bank 2 (HO2S12) and that the sensor consistently indicates a rich exhaust condition. Specifically, “Bank 1 Sensor 2” refers to the oxygen sensor […]

What Does Code P1139 Mean? DTC P1139 signifies a malfunction within the Water In Fuel (WIF) indicator circuit. This code is typically encountered in diesel-powered vehicles equipped with a fuel-water separator system, as gasoline engines generally do not utilize WIF sensors. The Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), monitors […]

What Does Code P1140 Mean? DTC P1140 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a water-in-fuel condition. This code specifically points to an input signal from the Water-In-Fuel (WIF) sensor that suggests the presence of water in the vehicle’s fuel supply, exceeding a manufacturer-defined threshold, or a potential […]

What Does Code P1141 Mean? Diagnostic Trouble Code P1141, defined as “Fuel Restriction Indicator Circuit Malfunction,” signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an electrical fault within the circuit dedicated to the fuel restriction indicator sensor. This sensor, often referred to as a Fuel Filter Restriction Sensor (FFRS) […]

What Does Code P1142 Mean? DTC P1142 indicates that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected a condition where the engine is experiencing a significant fuel restriction within the fuel delivery system. This code is often manufacturer-specific, but generally points to an inadequate supply of fuel […]

What Does Code P1143 Mean? The P1143 diagnostic trouble code signifies an issue with the Air Assist Control Valve (AACV) system, specifically indicating a “Range/Performance” fault. This means the Engine Control Module (ECM), also referred to as the Powertrain Control Module (PCM), has detected that the AACV is not operating within its specified parameters or […]

What Does Code P1144 Mean? DTC P1144 indicates an “Air Assist Control Valve Circuit Malfunction.” This code is set by the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), when it detects an electrical fault within the circuit controlling the Air Assist Control Valve (AACV). The AACV is an […]

What Does Code P1150 Mean? DTC P1150, “Lack Of HO2S21 Switch – Adaptive Fuel At Limit,” indicates a specific malfunction within the powertrain control system, focusing on the upstream oxygen sensor for Bank 2 (Sensor 1) and the engine’s ability to maintain an optimal air/fuel ratio. HO2S21 refers to the Heated Oxygen Sensor located on […]