Gear Shift Reverse Actuator Circuit High
The transmission's reverse gear actuator circuit is receiving too much electrical voltage, like a speaker turned up too loud. This prevents the reverse gear from engaging properly or causes it to malfunction.
The ECM monitors the voltage signal from the reverse actuator solenoid circuit. When voltage exceeds the maximum threshold (typically above 14.5V), the ECU detects a high voltage condition indicating a wiring short, damaged solenoid, or faulty relay.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Actuator Circuit Voltage | 11.5V - 14.5V | Above 14.5V (high condition) |
| Solenoid Resistance | 4-12 ohms | Below 4 ohms (indicates short) |
Code P0927 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0927 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.