What it means
The transmission control system detected an incorrect shift from 9th gear. The code does not identify the cause.
At a glance
- Usually lights the check-engine light
How it works
The transmission control system monitors the transition out of 9th gear and checks whether the resulting gear and speed relationship match the shift it requested. This code sets when the shift from 9th does not follow the expected pattern; it does not name the failed part.
Common causes
Most likely first.
- Shift solenoid sticking or malfunctioning
- Low or degraded transmission fluid
- Hydraulic pressure or valve body fault
- Worn or damaged clutch or friction element
- Internal transmission wear or damage
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
- Record freeze-frame data and scan related transmission codes, paying attention to the shift requested from 9th and the actual gear reported.
- Check fluid level and condition using the specified procedure, since low or degraded fluid can delay or disrupt the shift.
- Inspect shift-control wiring, connectors, and accessible linkage or actuator parts for damage or binding.
- Compare commanded gear with live input and output speeds during a suitable test to determine whether the shift is delayed, missed, or followed by slipping.
- Test the relevant solenoid and hydraulic control operation using the manufacturer’s procedure.
- If control operation and pressure are sound, inspect the clutch or friction element involved in the shift from 9th for wear or damage.
Common fixes
- Correct low fluid or service degraded fluid using the specified procedure.
- Repair damaged shift-control wiring or connectors.
- Repair a confirmed binding external linkage or actuator.
- Repair a verified solenoid or valve-body fault.
- Repair internal clutch or friction-element damage if confirmed.
Can I keep driving?
Limit driving if shifts out of 9th are harsh, delayed, or accompanied by slipping, because repeated slipping can damage internal friction parts. Avoid towing or hard acceleration, and stop safely if the transmission loses drive or enters limp mode.
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.