Buick Regal: DTC P2725, P2729, or P2730
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: Refer to Strategy
Based Diagnosis
- An overview of each diagnostic category can be found here: Refer to
Diagnostic Procedure Instructions
DTC Descriptor
DTC P2725
Pressure Control Solenoid Valve 5 Control Circuit
DTC P2729
Pressure Control Solenoid Valve 5 Control Circuit Low Voltage
DTC P2730
Pressure Control Solenoid Valve 5 Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test Status
Pressure Control Solenoid Valve 5 Control Circuit Low Voltage Test Status
Pressure Control Solenoid Valve 5 Control Circuit Open Test Status
Circuit/System Description
The solenoid valve controls the flow of transmission fluid to the hydraulic
actuator that controls the C5 clutch.
Conditions for Running the DTC
P2725
- { P2725 }DTC P0606, P0657, P0962, P0963, P0966, P0967, P0970, P0971,
P2720, P2721, P2729, P2730,
P2738, P2739 = Not set
- { P2729 }DTC P0606, P0657, P0963, P0967, P0971, P2721, P2730, P2739 =
Not set
- { P2730 }DTC P0606, P0657, P0962, P0966, P0970, P2720, P2729, P2738, =
Not set
- Ignition Voltage=9 to 32 V
Frequency the DTC runs=Continuously - After the running conditions are met
Conditions for Setting the DTC
P2725
Control Circuit=Commanded state does not match the actual state
P2729
Control Circuit=Less than 20 mA - For greater than 1 s
P2730
Control Circuit=Greater than 1358 mA - For greater than 1 s
Actions Taken When the DTC Sets
DTCs listed in the DTC Descriptor Category=Type A DTC
- Fail-Safe Mode=Active
- Learning=Disabled
- Transmission gear allowed=3rd Gear - After a stop
Conditions for Clearing the DTC
DTCs listed in the DTC Descriptor Category=Type A 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. Perform the scan tool control function:Pressure Control Solenoid Valve 5 -
Increase & Decrease
Verify the scan tool parameter:
- Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test
Status=Not Run or OK
- Pressure Control Solenoid Valve 5 Control Circuit Low Voltage Test
Status=Not Run or OK
- Pressure Control Solenoid Valve 5 Control Circuit Open Test Status=Not
Run or OK
- If not the specified state
- Refer to Circuit/System Testing
- Go to next step: If the specified state
3. Perform the scan tool control function:Pressure Control Solenoid Valve 5 -
Enable & Disable
Verify the component produces a clicking sound:Q27E Pressure Control Solenoid
Valve 5
- If the component does not produce a sound
Refer to Circuit/System Testing
- Go to next step: If the component produces a sound
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.
Verify the DTC does not set.
Refer to Circuit/System Testing
- Go to next step: If the DTC is not set
5. All OK.
Circuit/System Testing
NOTE: It may take up to 2 min for all vehicle systems to power down
before an
accurate ground or low reference circuit continuity test can be performed.
1. Ignition/Vehicle & All vehicle systems - Off
NOTE: Twisting or tilting of the transmission control module electrical
connector
while disconnecting may result in bent or misaligned electrical terminal pins.
2. Disconnect the electrical connector:X2@K71 Transmission Control Module
3. Test for 5.0 to 5.6 ohms between the test points:Control circuit terminal
5 & Low: Reference circuit terminal
12@Control module harness
- If not between 5.0 and 5.6 ohms
- Remove the component:Control Valve Body Cover
- Disconnect the electrical connector:Q27E Pressure Control Solenoid Valve
5
- Test for less than 2 ohms between the test points:
- Control circuit terminal 2@Component harness & Control circuit
terminal 5@Control module
harness
- Low: Reference circuit terminal 1@Component harness & Low: Reference
circuit terminal
12@Control module harness
- If 2 ohms or greater - Replace the component:Automatic Transmission
Wiring Harness
- If less than 2 ohms - Replace the component:Q27E Pressure Control
Solenoid Valve 5
- Go to next step: If between 5.0 and 5.6 ohms
4. Test for infinite resistance between the test points:
- Control circuit terminal 5 & Transmission Case
- Low: Reference circuit terminal 12 & Transmission Case
- If less than infinite resistance
- Remove the component:Control Valve Body Cover
- Disconnect the electrical connector:Q27E Pressure Control Solenoid Valve
5
- Test for infinite resistance between the test points:
- Control circuit terminal 2@Component harness & Transmission Case
- Low: Reference circuit terminal 1@Component harness & Transmission
Case
- If less than infinite resistance - Replace the component:Automatic
Transmission Wiring Harness
- If infinite resistance - Replace the component:Control Valve Body
- Go to next step: If infinite resistance
5. Replace the component:K71 Transmission Control Module
Component Testing
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector:Q27E Pressure Control Solenoid Valve 5
NOTE: The component's temperature should be 19 to 21ºC (66 to 70ºF)
while
testing.
3. Test for 5.0 to 5.6 ohms between the test points:Control terminal 2 & Low:
Reference terminal 1
- If not between 5.0 and 5.6 ohms
Replace the component:Control Valve Body
- Go to next step: If between 5.0 and 5.6 ohms
4. Test for infinite resistance between the test points:Each terminal of the
component & The component's
housing
- If less than infinite resistance
Replace the component:Control Valve Body
- Go to next step: If infinite resistance
5. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair: Refer
to Diagnostic Repair Verification
- Refer to Control Valve Body Replacement
- Refer to Wiring Harness Wire Replacement
- For control module replacement, programming, and setup: Refer to Control
Module: References
READ NEXT:
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 Diagnosi
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 Diagnosi
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 Diagnosi
SEE MORE:
Circuit/System Description
The camshaft position actuator solenoid valve - Intake and camshaft position
actuator solenoid valve -
exhaust system enables the engine control module (ECM) to change camshaft timing
while the engine is
running. The camshaft position actuator assembly varies camshaft po
General Towing Information
(Hatchback Models)
The vehicle is neither designed nor
intended to tow a trailer.
General Towing Information
(Station Wagon Models)
Only use towing equipment that has
been designed for the vehicle.
Contact your dealer or trailering
dealer for assistance with preparing
the