Chevrolet Trax: DTC P0969-P0971
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 P0969
Pressure Control Solenoid Valve 3 Performance
DTC P0970
Pressure Control Solenoid Valve 3 Control Circuit Low Voltage
DTC P0971
Pressure Control Solenoid Valve 3 Control Circuit High Voltage
Circuit/System Description
Pressure control solenoid valve 3 is part of the control solenoid valve
assembly which has no serviceable
components. The normally high pressure control solenoid valve 3 regulates and
directs fluid pressure to the
R1/4-5-6 regulator valve. Increasing pressure control solenoid valve 3 pressure
increases pressure to the low
and reverse clutch or 4-5-6 clutch, depending on the position of the clutch
select valve. The transmission control
module (TCM) varies current to pressure control Solenoid valve 3 by controlling
the time the low side driver is
ON and OFF. Decreasing the current to pressure control solenoid valve 3
increases fluid pressure by closing off
the solenoid valve exhaust port. Increasing the current to the pressure control
solenoid valve 3 decreases fluid
pressure by opening the exhaust port. Power is supplied to the pressure control
solenoid valve 3 by the TCM
through a high side driver. The high side driver protects the circuit and
components from excessive current
flow. If excessive current flow is detected, the high side driver will turn OFF.
When the fault is corrected, the
high side driver will reset.
Conditions for Running the DTC
- Engine speed is 400-7,500 RPM for 5 s.
- Ignition voltage is 9-32 V.
- Runs continuously when above conditions are met.
Conditions for Setting the DTC
P0969
TCM detects an internal electrical performance malfunction of the pressure
control solenoid valve 3 control
circuit where the measured pressure control solenoid valve 3 currents does not
equal the commanded clutch
pressure control solenoid valve 3 current for 5 s.
P0970
TCM detects a short to ground on the pressure control solenoid valve 3
control circuit for 1 s.
P0971
TCM detects an open or short to voltage on the pressure control solenoid
valve 3 control circuit for 1 s.
Action Taken When the DTC Sets
P0969
- P0969 is a Type C DTC.
- TCM freezes transmission adaptive functions on the low and reverse
clutch and the 4-5-6 clutch.
P0970 or P0971
- P0970 and P0971 are Type A DTCs.
- TCM limits the transmission to 4th gear and reverse.
- TCM commands maximum line pressure.
- TCM freezes transmission adaptive functions.
- TCM enables torque management.
- TCM inhibits Tap Up/Down function.
- TCM inhibits manual shifting of forward gears.
- TCM inhibits auto grade braking.
- TCM forces the high side driver OFF - P0970 only.
- TCM forces the torque converter clutch (TCC) OFF - P0970 only.
Conditions for Clearing the DTC
- P0969 is a Type C DTC.
- P0970 and P0971 are Type A DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Encore, MH8 or MHB) ,
Automatic Transmission
Controls Schematics (Trax, MH8 or MHB)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
- Inline Harness Connector End Views (Encore) , Inline Harness
Connector End Views (Trax)
Description and Operation
- Electronic Component Description
- Transmission Component and System Description
- Transmission General Description
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 (LUV) ,
Powertrain Diagnostic Trouble
Code (DTC) Type Definitions (2H0)
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-48616-10 Adapter Harness
For equivalent regional tools, refer to Special Tools .
Circuit/System Verification
- Operate the vehicle in second gear long enough to ensure at least a 3ºC
(5ºF) rise in TCM temperature,
then operate the vehicle with the transmission in Park for 5 s.
- Operate the vehicle in drive range. Allow the transmission to shift
through all forward gear ranges.
- Verify the scan tool parameters listed below do not display Malfunction:
- Pressure Control Solenoid Valve 3 Performance Test Status
- Pressure Control Solenoid Valve 3 Control Circuit Low Voltage Test
Status
- Pressure Control Solenoid Valve 3 Control Circuit High Voltage Test
Status
If Malfunction is displayed
Refer to Circuit/System Testing
If Malfunction is not displayed
- 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.
If the DTC sets
Refer to Circuit/System Testing.
If the DTC does not set
- All OK.
Circuit/System Testing
NOTE: You must perform the Circuit/System Verification first.
- Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
- Verify the Q8 Control Solenoid Valve Assembly is not contaminated with
any debris and clean as
necessary. Refer to Control Solenoid Valve and Transmission Control Module
Assembly Inspection.
If contaminated
Repair as necessary.
If not contaminated
- Verify the resistance is within the specified range for each solenoid
valve listed in the Control Solenoid
Valve and Transmission Control Module Assembly Inspection.
If the resistance is not within range
Replace the Q8 Control Solenoid Valve Assembly.
If the resistance is within range
- Place the Q8 Control Solenoid Valve Assembly on a clean work surface
near the transmission assembly.
- Connect the DT-48616-10 adapter harness between the vehicle harness
connector and the Q8 Control
Solenoid Valve Assembly connector. Ignition ON.
- Verify the scan tool parameters listed below do not display Malfunction:
- Pressure Control Solenoid Valve 2 Performance Test Status
- Pressure Control Solenoid Valve 2 Control Circuit Low Voltage Test
Status
- Pressure Control Solenoid Valve 2 Control Circuit High Voltage Test
Status
If Malfunction is displayed
Replace the Q8 Control Solenoid Valve Assembly.
If Malfunction is not displayed
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Perform the Transmission Adaptive Values Learn following all
transmission repairs
- Control Module References - for Control Solenoid Valve Assembly
replacement, programming and
setup
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
Special Tools
CH-41013 Rotor Resurfacing Kit
CH-42450-A Wheel Hub Resurfacing Kit
For equivalent regional tools, refer to Special Tools.
WARNING: Refer to Brake Dust Warning .
The brake drums do not require refinishing as part of routine brake
system service. Do not refinish brake
drums in
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