What it means
The clutch A hydraulic pump motor does not produce the expected flow for the commanded speed. Worn pump, leakage, or aged motor characteristic.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The clutch A hydraulic pump motor supplies fluid flow for clutch actuation, and the control system checks the pump's response to its commanded speed. This code sets when the pump does not produce the expected flow for that command, which can result from a worn pump, leakage, or an aged motor that no longer performs as expected.
Common causes
Most likely first.
- Hydraulic pump worn
- Motor characteristic aged
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
- Review freeze-frame data and live pump commands, pressure or flow readings, and clutch A operation to establish when pump response falls short.
- Inspect accessible hydraulic connections and the pump area for leaks, damaged lines, or loose electrical connections.
- Check the hydraulic fluid condition and level only as specified for the vehicle, and look for evidence of fluid loss.
- Use the manufacturer's test procedure to compare commanded pump operation with measured flow or pressure.
- If there are no leaks or connection faults, test the pump motor and hydraulic pump against the manufacturer's specification.
Common fixes
- Repair a confirmed hydraulic leak at a connection or line.
- Restore the hydraulic fluid level or condition using the manufacturer's specified procedure and fluid.
- Repair a loose or damaged pump-motor electrical connection.
- Replace the hydraulic pump or motor if testing confirms inadequate performance.
Can I keep driving?
Avoid driving if shifts are delayed, slipping, or the vehicle enters limp mode; arrange recovery if it cannot change gears reliably. Continued operation with inadequate pump flow can worsen clutch or transmission damage.
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.