What it means
The transmission control module monitors how long friction element D takes to apply during a commanded gear change. It sets this code when the measured apply time falls outside the expected range.
At a glance
- Usually lights the check-engine light
How it works
The transmission control module measures how long friction element D, an internal clutch or band, takes to engage during a commanded shift. This code is stored when element D's apply time is outside the expected range, indicating that its hydraulic application or friction performance may be abnormal.
Common causes
Most likely first.
- Worn clutch friction plates
- Pressure control solenoid drift
- Internal hydraulic leak in apply circuit
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 and transmission data, and determine which gear change coincided with the element D apply-time fault.
- Check transmission fluid level and condition by the manufacturer's procedure, as insufficient or degraded fluid can affect apply pressure.
- Inspect transmission wiring and connectors for damage, corrosion, or loose connections that could alter solenoid control.
- Use a scan tool to compare element D apply-time readings with commanded shifts and pressure-control solenoid data.
- If the fault persists, have line pressure and the element D hydraulic circuit checked for a leak or restriction before judging internal clutch wear.
Common fixes
- Correct the fluid level or condition if it is outside the manufacturer's requirements.
- Repair damaged wiring or connector faults affecting transmission control.
- Replace a pressure-control solenoid only if test results confirm poor response.
- Repair the element D hydraulic circuit or clutch pack if internal leakage or wear is confirmed.
Can I keep driving?
Limit driving and avoid towing or hard acceleration, as continued slipping or harsh shifts can cause more transmission damage. Stop safely and arrange recovery if the vehicle loses drive or cannot shift reliably.
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.