P0931

Code

Generic P — Powertrain

Gear Shift Lock Solenoid/Actuator Control Circuit A High

Brand: Generic

Type: P — Powertrain

Views: UK: 33 EN: 58 RU: 28

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Page language: EN

Retrieve freeze frame and fault history with a scan tool; note conditions when DTC set
Visually inspect wiring harness and connectors for chafe, corrosion, heat damage, or bent pins at solenoid and PCM/TCM
Check connector terminals for corrosion, pushed-out pins, or water intrusion
Measure voltage at the solenoid connector with key ON (compare to battery voltage)
Backprobe the control circuit at the PCM/TCM connector and at the solenoid to compare readings
Check solenoid coil resistance and compare to specification

Inactive (no PCM command): circuit may sit near battery voltage through solenoid — approx 11–14 V (vehicle specific)
Active (PCM grounds low-side driver): voltage at solenoid/driver should be
Open-circuit voltage reading: near battery voltage at PCM pin with solenoid disconnected indicates open/short to B+ or high impedance
Solenoid coil resistance (typical range): 5–50 ohms (varies by model) — consult vehicle spec
If PCM driver is shorted to B+, voltage at PCM output may remain near battery voltage regardless of command

Scan for codes, record freeze frame data and any related transmission codes. Clear codes and attempt to re-create condition.
Visually inspect connectors and wiring between the PCM/TCM and gear shift lock solenoid. Repair any damaged harness sections.
With connector disconnected, measure solenoid coil resistance. If infinite or significantly out of spec, replace solenoid.
Reconnect and backprobe solenoid control circuit. With ignition ON and PCM commanding OFF, verify approx battery voltage at solenoid feed. With PCM commanding ON, observe voltage drop to
If the circuit reads battery voltage when PCM should be driving low, check for short to B+ (inspect wiring for chafe to constant power). Repair short if found.
If wiring checks good and solenoid coil ok, test PCM output: command the solenoid on/off using a capable scan tool while monitoring voltage. If PCM output stays high and wiring/solenoid are good, suspect PCM/TCM driver failure — consult manufacturer repair/replace procedures.
After repairs, clear codes and perform functional test of gear shift lock; road test as required. Verify DTC does not return.
Safety note: disconnect battery before repairing connectors or wiring. Use manufacturer procedures when replacing PCM/TCM.