What Does P0925 Mean?
The TCM has determined that the gear shift reverse actuator circuit is operating outside its expected performance parameters. The actuator responds but does not meet the TCM's criteria for speed, force, or current draw during even-gear or reverse engagement. This indicates a degrading actuator or increasing mechanical resistance in the shift mechanism.
Safety Warning
Degraded reverse actuator performance causes slow or incomplete even-gear engagement, leading to harsh shifts or gear clash. Avoid highway driving until repaired.
Common Causes
35%
Reverse actuator motor degradation with reduced torque output
25%
Mechanical resistance from worn synchronizers or shift components
25%
High resistance in actuator circuit wiring reducing delivered voltage
15%
Low battery/system voltage affecting actuator performance
Diagnostic Steps
1
Step 1: Command the reverse actuator via scan tool and measure response time and completion — compare to manufacturer specification for each gear engagement.
2
Step 2: Measure voltage drop across the entire actuator circuit during operation — supply side and ground side combined should not exceed 1V.
3
Step 3: Use a clamp ammeter to measure actuator current draw — compare to spec; high current means mechanical binding; low current means motor degradation.
4
Step 4: Disconnect the actuator and manually move the shift rail rearward to check for binding or excessive resistance in even-gear engagement.
5
Step 5: Verify battery voltage (12.6V rest, 13.8-14.4V running) — a weak battery can cause marginal actuator performance under load.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The TCM has determined that the gear shift reverse actuator circuit is operating outside its expected performance parameters. The actuator responds but does not meet the TCM's criteria for speed, force, or current draw during even-gear or reverse engagement. This indicates a degrading actuator or in...
The most common cause of P0925 (Gear Shift Reverse Actuator Circuit Range/Performance) is: Reverse actuator motor degradation with reduced torque output
Typical repair costs for P0925 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Degraded reverse actuator performance causes slow or incomplete even-gear engagement, leading to harsh shifts or gear clash. Avoid highway driving until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0925 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automated Manual Transmission (Shift Control)
Difficulty
Type
Generic (SAE)
Recommended Tools
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