P0924

Code

Generic P — Powertrain

Gear Shift Reverse Actuator Circuit/Open

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 43 RU: 25

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MIL (check engine/AT) illuminated
Transmission refuses or struggles to select REVERSE or slips into neutral on reverse command
Clicking or no sound from actuator when reverse is selected
Intermittent reverse engagement or only engages after key cycling
Related drivability or fault codes stored in TCM

Read stored DTCs and freeze frame data from both engine ECU and TCM; note any related transmission codes
Visually inspect wiring and connectors at the reverse actuator and TCM for damage, corrosion, or water intrusion
Check fuses/relays supplying the transmission actuators
Listen for actuator operation when commanding reverse (if accessible)
Perform a basic continuity and resistance check of actuator circuit with ignition off
Backprobe connector and observe voltage/ground while commanding reverse with scan tool

Power supply: typically battery voltage (~11–14.5 V) present at actuator power pin with ignition ON (vehicle dependent)
Control signal: TCM may switch ground or supply; when commanded expect a switched voltage change (0 V to near battery voltage) or PWM duty change
Actuator coil resistance: typical solenoid resistance range ~2–50 Ω (vehicle-specific) — consult manufacturer spec before relying on exact value
No-load current: expected modest current when energized; a very high or infinite resistance indicates short/open fault

Connect a diagnostic scan tool; record P0924 and any additional transmission codes, then clear and re-scan to confirm repeatability
Inspect the reverse actuator connector and wiring for chafing, pin damage, corrosion, water ingress or rodent damage
Check fuses/relays for the transmission control circuits and replace if blown
With ignition OFF, disconnect actuator and measure coil resistance across actuator pins; compare to manufacturer spec — infinite/open indicates failed actuator
With harness disconnected, check continuity between actuator connector and TCM connector for open circuit; also check for unintended continuity to ground or battery (short)
With connector connected and backprobed, have an assistant command reverse with scan tool while observing voltage/ground at the connector; verify correct switching behavior and battery voltage presence
Perform a wiggle test on wiring while monitoring live data or watching for code reappearance to find intermittent faults
If wiring and actuator check good, inspect TCM connector for damaged pins and verify TCM grounds and supply voltages; if suspicious, substitute a known-good actuator (if available) or perform TCM output tests per service manual
After repair, clear codes, perform functional tests and road test to confirm reverse engagement and no return of code