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

For an overview of the component/system, refer to:Electronic Component Description

The solenoid valve directs pressurized fluid to exit the accumulator to apply the clutches for a 1st gear start, during an Auto Start event.

Ignition Voltage=Greater than 6.4 V

Frequency the DTC runs=Continuously—After the running conditions are met

Control Circuit=Open Circuit—For greater than 1 s

Control Circuit=Short to Ground—For greater than 1 s

Control Circuit=Short to Voltage—For greater than 1 s

DTCs listed in the DTC Descriptor category=Type B DTC

Autostart/Autostop=Disabled

DTCs listed in the DTC Descriptor category=Type B DTC

Automatic Transmission Controls Schematics

Component Connector End Views

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

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Engine»Running@Idle
2. Transmission»Park
3. Perform the scan tool control function:Autostart/Autostop»On and Off@K20 Engine Control Module

   Verify the scan tool parameter:

• Transmission Accumulator Solenoid Valve Control Circuit High Voltage Test Status=OKorNot Run
• Transmission Accumulator Solenoid Valve Control Circuit Low Voltage Test Status=OKorNot Run
• Transmission Accumulator Solenoid Valve Control Circuit Open Test Status=OKorNot Run
• If not the specified state

  Refer to: Circuit/System Testing

• If the specified state
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.

• If the DTC sets

  Refer to: Circuit/System Testing

• If the DTC is not set
5. All OK.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:B280 Automatic Transmission Accumulator Solenoid Valve
3. Ignition » On / Vehicle » In Service Mode
4. Verify a test lamp turns On between the test points:Ignition circuit terminal 1&Ground
• If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Test for less than 2 Ω between the test points:Ignition circuit terminal 1&Output terminal@F15UA Fuse
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse.
• If the test lamp does not turn On and the circuit fuse is open
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Test for infinite resistance between the test points:Ignition circuit terminal 1&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:Automatic Transmission Auxiliary Fluid Accumulator
• If the test lamp turns On
5. Verify a test lamp does not turn On between the test points:Control circuit terminal 2&B+
• If the test lamp turns On
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Test for infinite resistance between the test points:Control circuit terminal 2@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:K20 Engine Control Module
• If the test lamp does not turn On
6. Remove » Test Lamp
7. Perform the scan tool control function:Autostart/Autostop»On

   Verify the scan tool parameter:Transmission Accumulator Solenoid Valve Control Circuit High Voltage Test Status=OK

• If not the specified state
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:Control circuit terminal 2@Component harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K20 Engine Control Module
• If the specified state
8. Connect a 3 A fused jumper wire between the test points:Control circuit terminal 2&Ignition circuit terminal 1
9. Perform the scan tool control function:Autostart/Autostop»On

   Verify the scan tool parameter:Transmission Accumulator Solenoid Valve Control Circuit High Voltage Test Status=Malfunction

• If not the specified state
1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Test for less than 2 Ω between the test points:Control circuit terminal 2@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If the specified state
10. Test or replace the component:B280 Automatic Transmission Accumulator Solenoid Valve

1. Ignition/Vehicle » Off
2. Disconnect the electrical connector:B280 Automatic Transmission Accumulator Solenoid Valve
3. Test for 16 to 20 Ω between the test points:Control terminal 2&Ignition terminal 1
• If not between 16 and 20 Ω

  Replace the component:Automatic Transmission Auxiliary Fluid Accumulator

• If between 16 and 20 Ω
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:Automatic Transmission Auxiliary Fluid Accumulator

• If infinite resistance
5. All OK.

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

• Auxiliary Fluid Accumulator Installation
• Auxiliary Fluid Accumulator Removal
• For control module replacement, programming, and setup refer to:Control Module References

Transmission Adaptive Values Learn—Perform only when the component/system is serviced.