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P2669




DTC P2669 or P2670

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC P2669
- Solenoid High Control Circuit Group 2

DTC P2670
- Solenoid High Control Circuit Group 2 Low Voltage

Diagnostic Fault Information





Circuit/System Description

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.

Conditions for Running the DTC

P2669
* DTC P2669 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM.
* HSD2 is commanded ON.

P2670
* DTC P2670 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM.
* HSD2 is commanded ON.

Conditions for Setting the DTC

P2669

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

P2670

The TCM detects a short to ground on 2 or more of the solenoids (SS1, SS2, SS3, or PCS2) connected to the HSD2.

Action Taken When the DTC Sets

P2669
* DTC P2669 is a Type A DTC.
* If DTC sets while in a forward range, the TCM commands 1st, 3rd, or 5th gear. If the DTC sets while in REVERSE, the transmission stays in reverse.
* The TCM inhibits torque converter clutch (TCC) engagement.

P2670
* DTC P2670 is a Type A DTC.
* If the DTC sets while in a forward range, the TCM commands 1st, 3rd, or 5th gear. If the DTC sets while in REVERSE, the transmission stays in reverse.
* The TCM inhibits TCC engagement.

Conditions for Clearing the DTC

DTCs P2669 and P2670 are Type A DTCs.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Allison - Automatic Transmission)
Connector End View Reference

* Component Connector End Views (Connector End Views By Name)
* Inline Harness Connector End Views (Connector End Views By Number)

Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Control Module References) for scan tool information

Circuit/System Verification

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 scan tool 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.

Circuit/System Testing

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. Refer to Transmission Control Module Replacement (Allison - Automatic Transmission).

3. Connect a test lamp between the SS1 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 SS1 control circuit for a short to ground. If the circuit tests normal, replace the TCM.
• If the test lamp is always OFF, test the SS1 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 SS2 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 SS2 control circuit for a short to ground. If the circuit tests normal, replace the TCM.
• If the test lamp is always OFF, test the SS2 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 SS3 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 SS3 control circuit for a short to ground. If the circuit tests normal, replace the TCM.
• If the test lamp is always OFF, test the SS3 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 PCS2 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 PCS2 control circuit for a short to ground. If the circuit tests normal, replace the TCM.
• If the test lamp is always OFF, test the PCS2 control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.

11. Ignition OFF, remove the transmission oil pan. Refer to Oil Pan Replacement (Allison - Automatic Transmission).
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.

Component Testing

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 (SS1, SS2, SS3, TCC, and MAIN MOD) (Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD))Control Valve Solenoid Replacement (PCS1 and PCS2) (Control Valve Solenoid Replacement (PCS1 and PCS2)).
2. Test for an open circuit between the control circuit terminal 2 and the PCS2 solenoid metal case and between the B+ circuit terminal 1 and the PCS2 solenoid metal case.

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

3. 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 (Transmission Fluid Temperature Sensor) (Temperature Versus Resistance (Transmission Fluid Temperature Sensor))Temperature Versus Resistance (Speed Sensor) (Temperature Versus Resistance (Speed Sensor))Temperature Versus Resistance (Solenoid) (Temperature Versus Resistance (Solenoid)).

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

4. Ignition OFF, remove the SS1, SS2 and SS3 solenoids from the valve body. Refer to Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) (Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD))Control Valve Solenoid Replacement (PCS1 and PCS2) (Control Valve Solenoid Replacement (PCS1 and PCS2)).
5. Test the SS1, SS2 and SS3 for an open circuit between the control circuit terminal B and solenoid metal case and the B+ circuit terminal A and solenoid metal case.

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

6. 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 (Transmission Fluid Temperature Sensor) (Temperature Versus Resistance (Transmission Fluid Temperature Sensor))Temperature Versus Resistance (Speed Sensor) (Temperature Versus Resistance (Speed Sensor))Temperature Versus Resistance (Solenoid) (Temperature Versus Resistance (Solenoid)).

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

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Wiring Harness Replacement (Allison - Automatic Transmission)
* Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) (Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD))Control Valve Solenoid Replacement (PCS1 and PCS2) (Control Valve Solenoid Replacement (PCS1 and PCS2))
* Control Module References (Control Module References) for TCM replacement, setup, and programming

Repair Verification

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

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