Buick Regal: DTC P06DD or P06DE

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P06DD

Engine Oil Pressure Control Solenoid Valve Stuck Off

DTC P06DE

Engine Oil Pressure Control Solenoid Valve Stuck On

Circuit/System Description

The engine oil pressure control solenoid is a two port solenoid valve used to control engine oil pressure inside the mechanical engine oil pump. The ECM controls the commanded states of the engine oil pressure control solenoid with the following ECM input's.

• Engine Speed
• Engine Oil Temperature (calculated from the Engine Coolant Temperature Sensor)
• Engine Oil Pressure
• Engine Run Time

With the engine oil pressure control solenoid commanded Off, engine oil pressure is higher. When commanded On engine oil pressure is lower. The purpose of this diagnostic is to isolate either a stuck on or stuck off engine oil pressure control solenoid.

Conditions for Running the DTC

P06DD

• DTC P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0128, P0335, P0336, P0521, P0522, P0523, P06DA, P06DB, P06DC, P06DD, P06DE, P111E, P2227, P2228, P2229 or P2230 is not set.
• Engine speed within range of 1, 500 RPM to 2, 500 RPM.

P06DE

• DTC P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0128, P0335, P0336, P0521, P0522, P0523, P06DA, P06DB, P06DC, P06DD, P06DE, P111E, P2227, P2228, P2229 or P2230 is not set.
• Engine running for greater than 20 s.
• Engine speed is within range of 1500 RPM to 2500 RPM.
• Engine oil pressure control solenoid in low pressure for greater than 1.5 s.

Conditions for Setting the DTC

P06DD or P06DE

Engine oil pressure is above or below a calibrated amount during the time the solenoid is changing from ON to OFF states.

Action Taken When the DTC Sets

P06DD

DTC P06DD is a Type B DTC.

P06DE

DTC P06DE is a Type A DTC.

• Reduced Engine Power=Active
• P16 Instrument Cluster=Reduced Engine Power
• Q44 Engine Oil Pressure Control Solenoid Valve=Inactive
• Engine Oil Pressure=High

Conditions for Clearing the DTC

P06DD

DTC P06DD is a Type B DTC.

P06DE

DTC P06DE is a Type A DTC.

Reference Information

Schematic Reference

Engine Mechanical Schematics (LTG)

Connector End View Reference

Component Connector End View Index

Electrical Information Reference

Electrical Information Reference

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

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: The engine oil level and condition has a major impact on the engine oil pressure control system. Debris in the oil can interfere with the engine oil pressure control solenoid valve operation. Inspect for dirty or degraded crankcase oil. The engine may require an oil change. Inquire with the customer when the last oil change was performed. You may also monitor the scan tool Engine Oil Life Remaining parameter. Advise the customer an oil change may be required.

1. Verify correct engine oil level and condition.

2. Engine Running, increase and maintain the engine speed at 1, 800 RPM.

NOTE: Selecting the scan tool line graph function may make it easier to identify Engine Oil Pressure changes.

3. Verify the scan tool Engine Oil Pressure parameter changes greater than 30 kPa (4 PSI) when commanding the Engine Oil Pressure Control Solenoid On and Off.

• If the parameter does not change

Replace the Q44 Engine Oil Pressure Control Solenoid.

• Go to next step: If the parameter changes

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

• If the DTC sets

Refer to Oil Pressure Diagnosis and Testing.

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

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Oil Pump Flow Control Valve Replacement for engine oil pressure control solenoid replacement.

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