P0923 moderate

Gear Shift Forward Actuator Circuit High

The P0923 code means the vehicle's onboard diagnostic system has detected: Gear Shift Forward Actuator Circuit High. This is a moderate severity code.

My Garage →

Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $150 - $1,200 (parts and labor)

Check Your Fluid First

ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

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Read Transmission Codes

LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

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Common Symptoms

Check Engine Light on
Forward actuator circuit reads high
Transmission may enter limp mode
Abnormal transmission behavior

Probable Causes (Ranked by Likelihood)

Short to power in forward actuator circuit Very High
Contaminated or low transmission fluid High
Wiring or connector fault in the circuit Moderate
TCM internal failure Low

Step-by-Step Diagnostic Procedure

Use a scan tool to read Gear Shift Forward Actuator related data
Check transmission fluid level, condition, and color
Inspect the transmission wiring harness and connector for damage or corrosion
Compare sensor readings to manufacturer specifications

Frequently Asked Questions

What does P0923 indicate?

P0923 indicates a problem with the gear shift forward actuator circuit high. This is a transmission control system code that requires professional diagnosis.

Do I need a transmission rebuild?

Not necessarily. Many transmission codes are caused by solenoid failures, sensor issues, or fluid problems that can be repaired without a full rebuild.

How important is transmission fluid condition?

Very important. Contaminated or degraded fluid is a leading cause of transmission problems. It causes solenoid sticking, valve body issues, and accelerated clutch wear. Regular fluid changes can prevent many of these codes.