The transmission pressure is modified by an adaptive modifier, which controls the shift execution time. This diagnostic tests the time required to accomplish the shift. If the shift takes longer than 0.65 second and the adaptive modifier cannot shorten this time, then an internal transmission control module (TCM) counter increases by 1.

The 1-2, 2-3, or 3-4 shift is longer than 0.65 second more than once per trip.

DTC P1811 is a Type C DTC.

DTC P1811 is a Type C DTC.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

1. Perform the Transmission Fluid Check .

⇒	If the level is not within specifications, repair as necessary.

2. Perform the Line Pressure Check .

⇒	If the pressures are not within specifications, inspect and repair the following components:

•	Oil filter and seal missing, plugged, or damaged

•	Spacer plate and gasket damaged or not assembled correctly

•	PC solenoid valve damaged or contaminated

•	Pressure regulator valve line-up binding or damaged

•	Torque signal valve line-up binding or damaged

•	Oil pump assembly damaged or missing components

3. Verify the scan tool 1-2 Shift Time parameter is less than 0.65 seconds.

⇒	If the shift time is greater than 0.65 seconds, inspect and repair the following components:

•	1-2 accumulator piston seals rolled or damaged

•	1-2 accumulator piston and pin missing, binding, or damaged

•	Forward servo assembly damaged or not assembled correctly

•	Oil pump assembly damaged or missing components

•	Spacer plate and gaskets damaged or not assembled correctly

•	Driven sprocket support seals damaged or missing

•	Second clutch piston and seal assembly binding or damaged

•	Second clutch fiber and steel plates not assembled correctly, burned, or damaged

•	Second clutch spring assembly damaged or not assembled correctly

•	Forward band burned, damaged, or not assembled correctly

•	1-2 support roller clutch assembly damaged or not assembled correctly

4. Verify the scan tool 2-3 Shift Time parameter is less than 0.65 seconds.

⇒	If the 2-3 shift time is greater than 0.65 seconds, inspect and repair the following components:

•	2-3 accumulator piston seals rolled or damaged

•	2-3 accumulator piston and pin missing, binding, or damaged

•	Oil pump assembly damaged or missing components

•	Spacer plate and gaskets damaged or not assembled correctly

•	Driven sprocket support seals damaged or missing

•	Third clutch piston seal rolled or damaged

•	Third clutch piston damaged or not assembled correctly

•	Third clutch fiber and steel plates not assembled correctly, burned, or damaged

•	Third clutch spring assembly damaged or not assembled correctly

•	Third sprag clutch assembly damaged or not assembled correctly

5. Verify the scan tool 3-4 Shift Time parameter is less than 0.65 seconds.

⇒	If the 3-4 shift time is greater than 0.65 seconds, inspect and repair the following components:

•	Oil pump assembly damaged or missing components

•	Spacer plate and gaskets damaged or not assembled correctly

•	3-4 accumulator piston seals rolled or damaged

•	3-4 accumulator piston and pin missing, binding, or damaged

•	Fourth clutch piston seal rolled or damaged

•	Fourth clutch piston damaged, not assembled correctly, or seized

•	Fourth clutch fiber and steel plates not assembled correctly, burned, or damaged

•	Fourth clutch spring assembly damaged or not assembled correctly

6. Replace the automatic transmission fluid and filter. Refer to Transmission Fluid Check .

⇒	If the fluid is not at the proper level, add fluid as necessary.

Important: The Reset Transmission Adapts function will clear all adapt cells. This may affect transmission performance. The TCM will update the transmission adapt cell values as the vehicle is driven.

7. Perform the Reset Transmission Adapts function.

Perform the Diagnostic Repair Verification after completing the repair.