Archives: DTC Codes

What Does Code P1221 Mean? DTC P1221 indicates a general malfunction within the vehicle’s Traction Control System (TCS). This is a manufacturer-specific code, which means its precise definition can vary slightly between vehicle makes, but it consistently points to an issue preventing the TCS from operating correctly. The Engine Control Module (ECM) or Powertrain Control […]

What Does Code P1222 Mean? DTC P1222 indicates a malfunction within the powertrain control module (PCM) or engine control module (ECM) monitored output circuit for the Traction Control System (TCS). Specifically, the PCM/ECM has detected an electrical anomaly in the dedicated circuit that controls or communicates with a component responsible for traction control intervention. This […]

What Does Code P1223 Mean? DTC P1223 signifies an “Accelerator Pedal Position (APP) Sensor B Circuit High Input.” This code is specific to the electronic throttle control (ETC) system, commonly known as drive-by-wire. The Accelerator Pedal Position (APP) sensor assembly is a critical component that translates the driver’s physical input on the accelerator pedal into […]

What Does Code P1224 Mean? The diagnostic trouble code P1224 signifies that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected an issue with the Throttle Position Sensor (TPS) circuit labeled “B” during a self-test routine. In modern vehicles equipped with electronic throttle control (often referred to as […]

What Does Code P1225 Mean? DTC P1225 signifies a malfunction within the Needle Lift Sensor (NLS) circuit. The Needle Lift Sensor, often integrated into one of the fuel injectors (typically the #1 injector in many diesel applications), is a critical component in sophisticated direct injection and common rail diesel fuel systems. Its primary function is […]

What Does Code P1226 Mean? DTC P1226 signifies a detected malfunction within the Control Sleeve Sensor circuit, typically indicating that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has received an implausible signal from the sensor or detected an electrical fault within its circuit. The “Control Sleeve Sensor” is a critical component, most […]

What Does Code P1227 Mean? DTC P1227 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an overboost condition within the forced induction system. Specifically, it points to a scenario where the actual boost pressure significantly exceeds the desired or commanded boost pressure, leading the ECM/PCM to infer that the […]

What Does Code P1228 Mean? The OBD-II diagnostic trouble code P1228 indicates a malfunction within the wastegate control system, specifically signifying that the wastegate has “failed open” or is not closing adequately under boost pressure conditions. The Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), detects this condition by monitoring […]

What Does Code P1229 Mean? DTC P1229 signifies an Intercooler Pump Driver Fault, indicating that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an electrical malfunction within the control circuit dedicated to the intercooler pump. This pump is a critical component in forced induction systems (supercharged or turbocharged engines) responsible for […]

What Does Code P1230 Mean? DTC P1230 signifies a Fuel Pump Low Speed Malfunction detected by the Powertrain Control Module (PCM) or Fuel Pump Control Module (FPCM). In modern vehicles equipped with variable-speed fuel delivery systems, the FPCM is typically responsible for modulating the voltage and current supplied to the fuel pump, thereby controlling its […]