Definition of Code P0923
Fault code P0923 indicates a problem with the forward gear shift actuator circuit.
What Does Code P0923 Mean
Code P0923 is a generic OBD-II trouble code that detects an issue with the forward gear shift actuator circuit of the transmission. The forward actuator is responsible for shifting the transmission into a forward drive gear (as opposed to reverse). If the Powertrain Control Module (PCM) or Engine Control Module (ECM) notices that the voltage reading from the forward gear shift actuator circuit is abnormal, code P0923 will be triggered.
What Causes Code P0923?
Several different issues can lead to the detection of fault code P0923:
- Faulty forward gear shift actuator
- Damaged or defective forward guide rail
- Damaged or defective shift shaft
- Mechanical problem within the internal transmission
- In very rare cases, a faulty PCM, ECM, or transmission control module
- Defective electrical components in the transmission system, such as shorted wires or open connectors
What Are the Symptoms of Code P0923?
When fault code P0923 is detected, the Check Engine light will likely illuminate on the vehicle’s dashboard. The car may also experience shifting issues and could be completely unable to engage a forward drive gear. If the car can be driven, fuel efficiency is likely to be reduced.
How Does a Mechanic Diagnose Code P0923?
Code P0923 will be diagnosed using a standard OBD-II fault code scanner. A qualified technician will use the scanner’s freeze frame data to gather information about the code and look for any additional fault codes that are present. If multiple codes are detected, the mechanic must address them in the order they appear on the scanner. Then, the fault codes will be reset, and the vehicle restarted so the mechanic can see if the code remains detected. If not, there was likely a false trigger or the code represented an intermittent error.
If the fault code returns, the mechanic will begin with a visual inspection of the electrical components in the transmission system. All wires, connectors, fuses, and circuits should be checked and replaced if damaged. The technician may then inspect the forward gear shift actuator, forward guide rail, and shift shaft.
If code P0923 is still detected, a more comprehensive inspection of the transmission and PCM will be necessary.
It is important for the mechanic to stop after replacing any component to reset the fault codes and restart the vehicle. This allows the mechanic to know when the issue has been resolved.
Common Mistakes When Diagnosing Code P0923
The most frequent mistake when diagnosing code P0923 comes from not following the basic OBD-II diagnostic protocol. This protocol must be followed at all times, step by step, to ensure that inspections and repairs are as quick, thorough, and efficient as possible. If the protocol is not followed, there is a risk of mistakenly replacing a complex component when a simpler fix was all that was needed.
How Severe Is Code P0923?
Fault code P0923 may or may not prevent a car from driving. Even if the car can be driven, operating it in this condition risks causing additional damage to the transmission. For this reason, code P0923 should be addressed as soon as it is detected.
What Repairs Can Fix Code P0923?
Possible repairs for code P0923 include:
- Replacing the forward gear shift actuator
- Replacing system wires, connectors, and circuits
- Replacing or adjusting the forward guide rail
- Replacing or adjusting the shift shaft
- In very rare cases, replacing the PCM, ECM, or transmission control module