Technical Description of OBD-II Trouble Code
The Output Speed Sensor is experiencing intermittent issues.
What does that mean?
This is a generic diagnostic trouble code (DTC) that applies to OBD-II vehicles, including those from VW, BMW, Mercedes, Chevrolet, GMC, Allison, Duramax, Dodge, Ram, Ford, Honda, Hyundai, Audi, etc. The exact repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle.
The P0723 OBD-II trouble code is associated with the Transmission Output Speed Sensor.
When the Powertrain Control Module (PCM) detects a malfunction in the Output Speed Sensor Circuit, it can trigger a wide variety of codes depending on the specific vehicle and automatic transmission.
Some common code responses related to Transmission Output Speed Sensor issues include codes P0720, P0721, P0722, and P0723. These codes indicate the specific malfunction that alerts the PCM to set the code and activate the Check Engine Light.
The purpose of the Transmission Output Speed Sensor is to provide the PCM with a signal that indicates the speed of the transmission output shaft rotation. The PCM uses this information to control the shift solenoids, which direct fluid between hydraulic circuits and change the transmission gear ratio at the appropriate time. Depending on the vehicle and transmission configuration, the Output Speed Sensor may also control the speedometer reading. The Transmission Output Speed Sensor is a crucial component in the operation of an automatic transmission.
Code P0723 is set by the PCM when it does not receive a regular, consistent signal from the Output Speed Sensor.
What is the severity of this DTC?
The severity of this code typically starts as moderate but can rapidly progress to a more severe level if not corrected promptly.
Photo of a transmission speed sensor:
What are some of the symptoms of the code?
Symptoms of a P0723 trouble code may include:
What are some of the common causes of the code?
Causes for this P0723 transmission code may include:
What are some P0723 troubleshooting steps?
Prior to beginning the troubleshooting process for any malfunction, it is recommended to research the Technical Service Bulletins (TSB’s) for the specific vehicle by year, model, and transmission. This can save a lot of time by providing guidance in the right direction.
The first step is to ensure the fluid level is correct and inspect the condition of the fluid for contamination. It is also important to check the vehicle records to verify the last time the filter and fluid were changed, if possible. Next, conduct a thorough visual inspection of the associated wiring for any obvious defects such as scraping, rubbing, bare wires, or burn spots. Check the connectors and connections for security, corrosion, and damaged pins. This includes all wiring and connectors to the output speed sensor, transmission solenoids, transmission pump, and the PCM. Depending on the configuration, inspect the transmission linkage for security and freedom of movement.
Advanced Steps
The advanced steps are highly vehicle-specific and require the appropriate advanced equipment to perform correctly. These procedures involve using a digital multimeter and following the specific technical references for the vehicle. It is important to follow the specific troubleshooting guidelines and sequence for your vehicle. Voltage requirements may vary based on the specific model of the vehicle and the transmission configuration.
Continuity Checks
Continuity checks should always be performed with the power removed from the circuit to avoid shorting the circuit and causing further damage. Unless otherwise specified by the technical data, the normal readings for wiring and connections should be 0 ohms of resistance. Resistance or no continuity indicates faulty wiring that is open or shorted and must be repaired or replaced.
Common Repairs
Common Misdiagnosis
We always recommend seeking professional service to mechanically solve this issue. However, if that is not possible, we offer the option to permanently delete this specific DTC. All other codes will continue to function. If you are interested in this option, please upload your ECU file to our portal.
