Buick Regal: DTC P170A-P170E
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 P170A
Transmission Hydraulic Circuit 2 Max Pressure Not Achieved
DTC P170B
Transmission Hydraulic Circuit 3 Max Pressure Not Achieved
DTC P170C
Transmission Hydraulic Circuit 4 Max Pressure Not Achieved
DTC P170D
Transmission Hydraulic Circuit 5 Max Pressure Not Achieved
DTC P170E
Transmission Hydraulic Circuit 6 Max Pressure Not Achieved
Circuit/System Description
The pressure control solenoid valves control fluid pressure to the C1, 2, 3,
4 and B1 clutches. The respective
pressures were not reached when the transmission experienced an abnormal upshift/downshift
or a tie-up during
shifts.
Conditions for Running the DTC
- DTC P0563, P0601, P0602, P0604, P0711, P0712, P0713, P0717, P07BF,
P07C0, P0722, P0748, P077C,
P077D, P0778, P0798, P0962, P0963, P0966, P0967, P0970, P0971, P2716, P2720,
P2721, P2725, P2729,
P2730, P2734, P2738, P2739 = Not set
- Ignition=On
- Battery Voltage=9 to 32 V - For greater than 2 s
- Engine Speed=Greater than 400 RPM
- Transmission Range= Drive
- Transmission Fluid Temperature=Warmer than -20ºC (4ºF)
- Garage Shift =No
- Transmission OSS=Greater than 300 RPM
- Slip Detected=No
- Accelerator Pedal=Greater than 70%
- Engine Torque =Greater than 70 Nm (52 lb ft)
- Transmission OSS=300 to 3000 RPM
- Transmission OSS=Less than -50 RPM per second
Conditions for Setting the DTC
Condition 1
Clutch C1, C2, C3, C4, B1=Not released
Condition 2
Incorrect gear ratio@Current Gear - More than 5 times.
Actions Taken When the DTC Sets
DTCs listed in the DTC Descriptor Category=Type A DTC
Fail-Safe Mode=Active
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
- Refer to Inline Harness Connector End View Index
Component View: Reference
Refer to Disassembled Views.
Description and Operation
- Refer to Electronic Component Description
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:
- Q27A Pressure Control Solenoid Valve 1
- Q27B Pressure Control Solenoid Valve 2
- Q27C Pressure Control Solenoid Valve 3
- Q27D Pressure Control Solenoid Valve 4
- Q27E Pressure Control Solenoid Valve 5
- 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.
Repair or replace as necessary.
- Go to next step: If no condition exists
4. Verify there are no DTCs set related to the following
system/component:K173 Transmission Range Control
Module
Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no DTC is set
5. Clear the DTCs.
6. Perform the configuration/reset function: Refer to Learned Values Reset.
7. Road test the vehicle. Refer to Road Test.
8. Verify DTC P170A, P170B, P170C, P170D, P170E is not set.
- {Test failed 1 time (s) }If any of the DTCs are set
- Replace the component: Control Valve Body
- Refer to:Step 5
- {Test failed 2 time (s) }If any of the DTCs are set
- Replace the component: K71 Transmission Control Module
- Refer to:Step 5
- {Test failed 3 time (s) }If any of the DTCs are set
- Replace the component: T12 Automatic Transmission Assembly
- Refer to:Step 5
- Go to next step: If none of the DTCs are set
9. 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.
10. Verify the DTC does not set.
Refer to:Step 1
- Go to next step: If the DTC is not set
11. 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 Transmission 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:
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
D
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
D