Skip the auto shop - Our mechanics make house calls

P0923 OBD-II Trouble Code: Gear Shift Forward Actuator Circuit High

Check Engine Light

P0923 code definition

The P0923 trouble code notes a problem with the gear shift forward actuator circuit

What the P0923 code means

The P0923 code is a generic OBD-II trouble code that detects an issue with the transmission’s gear shift forward actuator circuit. The forward actuator is in charge of shifting the transmission into a forward-moving gear (as opposed to reverse). If the powertrain control module (PCM), or the engine control module (ECM) notices that the voltage reading from the gear shift forward actuator circuit is unusual, the P0923 code will be triggered.

What causes the P0923 code?

There are a few different problems that can result in the P0923 trouble code being detected:

  • Malfunctioning gear shift forward actuator
  • Damaged or defective forward gear guide rail
  • Damaged or defective shift shaft
  • Mechanical problem in the internal transmission
  • In very rare cases, a malfunctioning PCM, ECM, or transmission control module
  • Faulty electrical components in the transmission system, such as shorted wires or open connectors

What are the symptoms of the P0923 code?

When the P0923 trouble code is detected, the Check Engine Light will likely illuminate on the vehicle’s instrument panel. The car may also experience problems shifting into gear, and may be entirely unable to access a forward-moving gear. If the car is drivable, it is likely that the fuel efficiency will be reduced.

How does a mechanic diagnose the P0923 code?

The P0923 code will be diagnosed using a standard OBD-II trouble code scanner. A trained technician will use the scanner’s freeze frame data to gather information about the code, and to look for any additional trouble codes that are present. If multiple codes are detected, the mechanic should take care of them in the order in which they appear on the scanner. Next, the trouble codes will be reset, and the vehicle will be restarted, so the mechanic can see if the code remains detected. If it does not, then there likely was an erroneous trigger, or the code represented an intermittent error.

If the trouble code returns, then the mechanic will start with a visual inspection of the transmission system’s electrical components. All wires, connectors, fuses, and circuits should be checked, and replaced if they are in any way damaged. The technician can then inspect the gear shift forward actuator, the forward gear guide rail, and the shift shaft.

If the P0923 code is still detected, a more comprehensive inspection of the transmission and PCM will be in order.

It is important that the mechanic stop after any component is replaced to reset the trouble codes and restart the vehicle. This will allow the mechanic to know when the problem has been fixed.

Common mistakes when diagnosing the P0923 code

The most commonly made mistake when diagnosing the P0923 code comes from a failure to follow the basic OBD-II diagnosis protocol. This protocol should be followed at all times, step by step, to ensure that inspections and repairs are as quick, thorough, and effective as possible. If the protocol is not followed, it is possible that a complex component will be erroneously replaced, when a simpler fix was all that was needed.

How serious is the P0923 code?

The P0923 trouble code may or may not keep a car from being drivable. Even if the car is drivable, to drive it under this condition will run the risk of causing further damage to the transmission. For this reason, the P0923 code should be addressed as soon as it is detected.

What repairs can fix the P0923 code?

Possible repairs for the P0923 code include:

Additional comments for consideration regarding the P0923 code

It is unlikely that the P0923 trouble code signals a defective PCM, ECM, or transmission control module, so all other potential issues should be checked before one of these is assumed to be the error. However, if a control module does need to be replaced, it will also need to be reprogrammed.

Need help with a P0923 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...


Related questions

Q: I changed out the camshaft position sensor, the car is still stalling and hard to start. It now shows a different P code.

The coolant temperature sensor (CTS) in your vehicle has failed and is making the computer think that the engine is too hot. When you shut off the engine and the engine will not restart, is it because the computer thinks...

Q: Car stalling randomly

With the illumination of the Check Engine Light, a fault code is generally stored in the system, and can be scanned by a mechanic. The engine computer relies on several signals from sensors for vital information to keep the engine...

Q: just bought a 2008 kia spectra5 . drove it about 60 miles check engine light came on code is po700, po 755 but shifts fine car run

The p0700 code is more of a general information code, while the p0755 code is much more specific. The p0755 code refers to the 2-4 shift solenoid in the transmission. The code can set due several possible issues. Low fluid,...