Buick Regal: DTC P2808

Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure: Refer to Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here: Refer to Diagnostic Procedure Instructions

DTC Descriptor

DTC P2808

Pressure Control Solenoid Valve 7 Stuck Off - Hydraulic/Mechanical Problem

Circuit/System Description

The pressure control solenoid valve 7 is used to apply the C1 clutch during an autostop event. If the control module K71 detects the following conditions, DTC P2808 will set:

• Engine speed flare-up
• Incorrect gear ratio

Conditions for Running the DTC

• K71 Transmission Control Module=Communication Enabled
• Transmission Gear=1, 2, 3
• Transmission OSS=Less than 200 RPM
• Transmission Range=Drive

DTC runs continuously when the above conditions are met for greater than 2 s.

Conditions for Setting the DTC

Gear Ratio=Incorrect - More than 11 times.

Actions Taken When the DTC Sets

DTC P2808 is a Type C DTC.

Conditions for Clearing the DTC

DTC P2808 is a Type C DTC.

Reference Information

Schematic: Reference

Refer to Automatic Transmission Controls Wiring Schematics

Connector End View: Reference

Refer to Component Connector End View Index

Component View: Reference

Refer to Disassembled Views

Description and Operation

Refer to Transmission General Description

Electrical Information: Reference

• Refer to Circuit Testing
• Refer to Connector Repairs
• Refer to Testing for Intermittent Conditions and Poor Connections
• Refer to Wiring Repairs

DTC Type: Reference

Refer to Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool: Reference

Refer to Control Module: References

Circuit/System Verification

1. Ignition - On / Vehicle - In Service Mode.

2. Verify there are no DTCs set related to the following system/component:

• Transmission ISS
• Transmission OSS
• If other DTCs are set

Refer to: Diagnostic Trouble Code (DTC) List - Vehicle

• Go to next step: If no other DTCs are set

3. Verify the condition does not exist:Incorrect fluid level or condition. Refer to Transmission Fluid Level and Condition Check

• If a condition exists

Repair or replace as necessary.

• Go to next step: If no condition exists

4. Clear the DTCs.

5. Perform the configuration/reset function: Refer to Learned Values Reset.

6. Road test the vehicle. Refer to Road Test.

7. Verify DTC P2808 is not set.

• If any of the DTCs are set.

Replace the component: Control Valve Body Assembly

• Go to next step: If the DTC is not set

8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Refer to Diagnostic Repair Verification

• Refer to Control Valve Body Replacement
• For control module replacement, programming, and setup: Refer to Control Module: References

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