P0930 critical

Gear Shift Reverse Actuator Circuit Open

The P0930 code means the vehicle's onboard diagnostic system has detected: Gear Shift Reverse Actuator Circuit Open. This is a critical severity code.

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Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $300 - $1,500 (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 illuminated
Cannot select reverse gear
No reverse movement when selected
Transmission warning light on

Probable Causes (Ranked by Likelihood)

Failed reverse shift actuator motor Very High
Open circuit in reverse actuator wiring High
Disconnected reverse actuator connector Moderate
TCM reverse output driver failure Low

Step-by-Step Diagnostic Procedure

Check the reverse shift actuator connector
Measure reverse actuator motor resistance
Test wiring continuity from TCM to reverse actuator
Command the reverse actuator with a bidirectional scan tool

Frequently Asked Questions

Can I still drive forward with P0930?

Yes, forward gears should still work. However, you will not be able to reverse, which makes parking and maneuvering very difficult.

Is the reverse actuator a separate part from the forward actuator?

In most automated manual transmissions, the forward and reverse functions use the same shift actuator moving in opposite directions. However, some designs use separate actuators.

How do I know if it is the actuator or the wiring?

Check the actuator resistance with a multimeter. If the resistance is within specification, the actuator is likely good and the wiring is the problem. An open reading indicates a failed actuator.