The TCM provides B+ to shift solenoid 1 (SS1), shift solenoid 2 (SS2), shift solenoid 3 (SS3), and pressure control solenoid 2 (PCS2) through a separate solid state device called high side driver 2 (HSD2). The TCM uses low side drivers to control the solenoids.

P2669

This DTC sets when the HSD2 voltage is greater than 6 V and the TCM detects an open circuit on 2 or more of the solenoids (SS1, SS2, SS3, or PCS2) connected to the HSD2.

P2670

This DTC sets when the HSD2 voltage is less than 6 V and the TCM detects a short to ground on 2 or more of the solenoids (SS1, SS2, SS3, or PCS2) connected to the HSD2.

P2669

P2670

DTCs P2669 and P2670 are Type A DTCs.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, engine OFF, command the Shift Solenoid 1, Shift Solenoid 2, Shift Solenoid 3, and PC Solenoid 2 solenoid ON and OFF with a scan tool. Observe the operation of the Shift Solenoid 1, Shift Solenoid 2, Shift Solenoid 3 , and PC Sol. 2 Pressure Command parameters. The Shift Solenoid 1, Shift Solenoid 2 and Shift Solenoid 3 parameters should turn On and Off and the PC Sol. 2 Pressure Command parameter should change from 0 kPa (0 psi) to 1600 kPa (232 psi).
2. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

1. Ignition OFF, disconnect the X175 harness connector at the transmission.
2. Ignition ON, engine OFF. Verify that a test lamp illuminates between the B+ circuit terminal N and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the TCM.

3. Connect a test lamp between the control circuit terminal A and the B+ circuit terminal N.
4. Command the Shift Solenoid 1 ON and OFF with a scan tool and verify the Shift Solenoid 1 parameter changes from On to Off. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the TCM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.

5. Connect a test lamp between the control circuit terminal B and the B+ circuit terminal N.
6. Command the Shift Solenoid 2 ON and OFF with a scan tool and verify the Shift Solenoid 2 parameter changes from On to Off. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the TCM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.

7. Connect a test lamp between the control circuit terminal C and the B+ circuit terminal N.
8. Command the Shift Solenoid 3 ON and OFF with a scan tool and verify the Shift Solenoid 3 parameter changes from On to Off. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the TCM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.

9. Connect a test lamp between the control circuit terminal P and the B+ circuit terminal N.
10. Command the PC Solenoid 2 ON and OFF with a scan tool and verify the PC Sol. 2 Pressure Command parameter changes from 1600 kPa (232 psi) to 0 kPa (0 psi). The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the TCM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.

11. Remove the transmission oil pan. Refer to Oil Pan Replacement.
12. Test the transmission internal HSD2 B+ and SS1, SS2, SS3, and PCS2 control circuits for a short to voltage, short to ground or an open/high resistance.

⇒	If the circuits test normal, test the PCS2, SS1, SS2, and SS3 solenoids.

Static Testing

Note: You must perform the Circuit/System Testing first.

1. Ignition OFF, remove the PCS2 from the valve body. Refer to Control Valve Solenoid Replacement.
2. Test for the specified resistance between the control circuit terminal 2 and the B+ circuit terminal 1 of the PCS2. Refer to Temperature Versus Resistance.

⇒	If not within the specified range, replace the PCS2 solenoid.

3. Ignition OFF, remove the SS1, SS2 and SS3 solenoids from the valve body. Refer to Control Valve Solenoid Replacement.
4. Test for resistance between the control circuit terminal B and the B+ circuit terminal A of SS1, SS2, and SS3. Refer to Temperature Versus Resistance.

⇒	If not within the specified range, replace the affected solenoid.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.