Gear Shift Reverse Actuator Circuit Open
What does P0930 mean?
The P0930 code means the vehicle's onboard diagnostic system has detected: Gear Shift Reverse Actuator Circuit Open. This is a critical severity code.
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
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Check the reverse shift actuator connector
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Measure reverse actuator motor resistance
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Test wiring continuity from TCM to reverse actuator
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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.