What it means
The transmission control module detected an incorrect shift from 7th gear. The code does not specify which component caused the shift error.
At a glance
- Usually lights the check-engine light
How it works
During a shift out of 7th gear, the TCM checks whether the commanded transition completes on time and whether transmission speed signals match the expected change. This code identifies an incorrect shift from 7th, but does not pinpoint the failed solenoid, hydraulic circuit, or friction element.
Common causes
Most likely first.
- Shift solenoid sticking or malfunctioning
- Low or degraded transmission fluid
- Hydraulic pressure loss 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
- Save freeze-frame data and review commanded gear, actual gear, speeds, and related transmission codes to identify the conditions during the shift from 7th.
- Check the fluid level and condition using the manufacturer’s procedure, and inspect for leaks that could reduce shift pressure.
- Inspect wiring and connectors for the transmission’s shift solenoids and speed sensors for damage, corrosion, or loose connections.
- Use live data during a safe road test to see whether the shift is commanded and whether speed readings confirm a delayed or incomplete transition.
- If the circuits and sensor signals are sound, test solenoid operation and hydraulic pressure using manufacturer procedures, then assess internal friction-element wear.
Common fixes
- Repair fluid leaks and restore the fluid level to the specified range using the correct fluid.
- Replace degraded or incorrect fluid when service findings support it.
- Repair damaged shift-solenoid or speed-sensor wiring and connectors.
- Replace a shift solenoid confirmed faulty by circuit and operation tests.
- Repair a confirmed valve-body fault or worn internal friction element.
Can I keep driving?
Avoid driving if the shift out of 7th causes pronounced slipping, shuddering, or limp mode, as further operation can worsen transmission damage. If it shifts with only mild symptoms, drive gently and avoid towing or sustained high speeds until it is diagnosed.
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.