What it means
The transmission control system detected that the vehicle is stuck in 10th gear. The code does not identify the cause.
At a glance
- Usually lights the check-engine light
How it works
The transmission control system checks whether the transmission can leave 10th gear when another gear is requested. This code sets when it detects that the transmission remains in 10th gear, but it does not identify the cause of the stuck condition.
Common causes
Most likely first.
- Shift solenoid sticking or malfunctioning
- Shift actuator or linkage binding
- Low or degraded transmission fluid
- Hydraulic pressure or valve body fault
- 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 all transmission modules for related codes, noting whether 10th gear was commanded or reported when the fault occurred.
- Check fluid level and condition using the vehicle maker’s specified procedure, since inadequate or degraded fluid can interfere with shifting.
- Inspect transmission wiring, connectors, and accessible shift linkage or actuator parts for damage, loose connections, or binding.
- Compare commanded gear with actual gear and speed data during a suitable test to confirm whether the transmission remains in 10th.
- Test the applicable shift solenoid or actuator using the manufacturer’s diagnostic procedure.
- If electrical controls work, check valve-body hydraulic operation and then assess for internal transmission wear or damage.
Common fixes
- Correct the fluid level or service degraded fluid according to the specified procedure.
- Repair damaged wiring or connectors in the shift-control circuit.
- Repair a confirmed binding linkage or external actuator.
- Replace a shift solenoid or actuator only if testing confirms it is faulty.
- Repair a verified valve-body or internal transmission fault.
Can I keep driving?
Avoid driving if the transmission stays in 10th and acceleration or low-speed control is poor; the fixed gear may make it difficult to move safely in traffic. Stop safely and arrange recovery if it slips, loses drive, or shifts unpredictably.
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.