Archives: DTC Codes

What Does Code P0726 Mean? DTC P0726, “Engine Speed Input Circuit Range/Performance,” indicates that the Powertrain Control Module (PCM), or Engine Control Module (ECM) in some architectures, has detected an inconsistency or irrationality in the engine speed input signal. The engine speed input is primarily derived from the Crankshaft Position (CKP) sensor, which generates a […]

What Does Code P0727 Mean? DTC P0727, which translates to “Engine Speed Input Circuit No Signal,” signifies that the Powertrain Control Module (PCM), also commonly referred to as the Engine Control Module (ECM), has detected an absence of an expected signal from the engine speed input circuit. In most modern vehicles, this input is primarily […]

What Does Code P0728 Mean? The diagnostic trouble code P0728 signifies an “Engine Speed Input Circuit Intermittent” condition. In many modern vehicle architectures, this code specifically points to an erratic or inconsistent signal from the Output Shaft Speed (OSS) sensor, which is a critical component for the Powertrain Control Module (PCM) or Engine Control Module […]

What Does Code P0730 Mean? The diagnostic trouble code P0730, “Incorrect Gear Ratio,” indicates that the Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected a discrepancy between the expected gear ratio and the actual gear ratio during specific driving conditions. Modern automatic transmissions utilize input speed sensors (also known as turbine speed […]

What Does Code P0731 Mean? DTC P0731, “Gear 1 Incorrect Ratio,” signifies that the Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected a discrepancy in the calculated gear ratio for first gear that falls outside of the manufacturer’s specified parameters. The PCM/TCM monitors the rotational speeds of the transmission’s input shaft (turbine […]

What Does Code P0732 Mean? The diagnostic trouble code P0732 signifies “Gear 2 Incorrect Ratio.” This code is triggered by the Powertrain Control Module (PCM) or Transmission Control Module (TCM), which continuously monitors the rotational speeds of the transmission’s input and output shafts. When the transmission is commanded to engage second gear, the PCM/TCM expects […]

What Does Code P0733 Mean? The diagnostic trouble code P0733 signifies “Gear 3 Incorrect Ratio.” This code is set by the Powertrain Control Module (PCM) or Transmission Control Module (TCM) when it detects a discrepancy between the expected rotational speed ratio of the input shaft and the output shaft, specifically when the transmission is commanded […]

What Does Code P0734 Mean? DTC P0734 signifies an “Incorrect Gear Ratio for 4th Gear.” This code is set by the Powertrain Control Module (PCM), which often integrates the Transmission Control Module (TCM), when it detects a significant deviation between the calculated gear ratio and the manufacturer-specified ratio for 4th gear engagement. The PCM continuously […]

What Does Code P0735 Mean? The OBD-II diagnostic trouble code P0735 signifies an “Incorrect Gear Ratio for Gear 5.” This code is set by the Transmission Control Module (TCM), or Powertrain Control Module (PCM) in some integrated systems, when it detects that the actual gear ratio of the transmission does not match the expected gear […]

What Does Code P0736 Mean? The diagnostic trouble code P0736 signifies an “Incorrect Reverse Gear Ratio” detected by the Powertrain Control Module (PCM) or Transmission Control Module (TCM). This code indicates that the actual gear ratio observed by the module when reverse gear is engaged does not match the factory-defined specifications for reverse. The PCM/TCM […]