P0926

Code

Generic P — Powertrain

Gear Shift Reverse Actuator Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 45 RU: 26

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Read freeze frame and live data with a scan tool; confirm P0926 and any related codes
Visual inspection of harness and connectors at the reverse actuator and TCM for damage, corrosion or water
Check relevant fuses and relays for transmission power and control circuits
Backprobe the actuator connector to measure voltage and signal while commanding reverse with a scan tool
Measure continuity and resistance of the actuator coil and wiring to the TCM
Wiggle test wiring while monitoring signal to reproduce intermittent faults

Actuator control voltage: typically 0–12 V depending on vehicle and command (check OEM spec)
When not commanded: terminal may be at battery voltage or float; when commanded ECU may pull to ground or apply PWM
Actuator coil resistance: commonly single-digit to low-double-digit ohms (example range ~5–50 Ω) — consult vehicle spec
PWM drivers (if used): frequency often in the tens to a few hundred Hz; duty cycle varies with command
Expected continuity: near 0 Ω continuity between actuator terminal and TCM output pin (allow small harness length resistance)

Verify the code and note freeze frame/live data. Record vehicle conditions when the code set.
Visually inspect actuator connector, wiring harness, transmission connector and TCM for damage, corrosion or loose pins.
Check battery voltage and transmission-related fuses/relays; restore proper battery voltage if low.
With ignition ON, backprobe the actuator control wire and measure voltage while commanding reverse via scan tool. Compare to expected behaviour.
Measure resistance of the actuator coil at the connector (power off). Compare to specification; an open or very low resistance indicates a fault.
Check continuity and resistance between the actuator connector and the TCM output pin; look for shorts to ground/power and opens.
Perform a wiggle test on the harness and connectors while monitoring the circuit for intermittent changes.
If wiring and connectors are good but the actuator does not respond or shows abnormal resistance/voltage, bench-test or apply specified test voltage to the actuator to verify operation (follow safety and OEM guidance).
If actuator is good and wiring is good but the TCM output is stuck low, suspect TCM driver failure; confirm with manufacturer diagnostics before replacing TCM.
Repair or replace the faulty wiring, connector, fuse, actuator or TCM as determined. Clear codes and road test to confirm the repair; verify no recurrence.