What it means
Shift solenoid G is not performing as expected or appears stuck off. The code does not identify the cause or which gears the solenoid controls.
At a glance
- Usually lights the check-engine light
How it works
Shift solenoid G controls hydraulic flow used to engage transmission gear combinations. The control module sets this code when solenoid G's performance does not match expectations or it appears stuck off; the code does not identify which gears it controls.
Common causes
Most likely first.
- Solenoid stuck closed by debris in the ATF
- Worn valve body bore leaking pressure
- Old, contaminated transmission fluid
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Save freeze-frame data and review transmission codes and live data for solenoid G commands and the shifts that fail.
- Check fluid level and condition using the manufacturer's procedure, because old or contaminated fluid can restrict solenoid G movement.
- Inspect the solenoid G connector and wiring for poor contact or damage before assuming the valve is stuck.
- Use a supported scan-tool active test to command solenoid G and observe the transmission response against the manufacturer's expected operation.
- If the electrical command is present but the expected hydraulic response is absent, inspect solenoid G and the valve body for debris, sticking, or pressure leakage.
Common fixes
- Correct the fluid level and service contaminated fluid as specified by the manufacturer.
- Repair poor connector contact or damaged wiring to solenoid G.
- Clean or replace shift solenoid G if it is restricted or fails testing.
- Repair a worn valve body bore that leaks pressure.
- Clean or repair a valve body passage blocked by debris.
Can I keep driving?
Limit driving if the transmission delays shifts, slips, or cannot engage gears reliably; avoid towing and heavy loads. Continued slipping can quickly increase internal transmission wear.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.