The 2-3 shift solenoid (SS) valve controls fluid acting on the 2-3 shift valve. The 2-3 SS valve is a normally open exhaust valve used with the 1-2 SS valve in order to allow four different shifting combinations. The 2-3 SS valve attaches to the control valve body within the transmission. The ignition voltage goes directly to the 2-3 SS valve. The powertrain control module (PCM) controls the 2-3 SS valve by providing a ground path through the 2-3 shift solenoid valve control circuit.
If the PCM detects a continuous open or short in the 2-3 SS valve circuit or the 2-3 SS valve, then DTC P0758 sets. DTC P0758 is a type C DTC. For California emissions vehicles and vehicles under 8,600 GVW, DTC P0758 is a type A DTC.
• | The system voltage is 8-18 volts. |
• | The engine is running more than 400 RPM for greater than 7 seconds. |
The above conditions are met and either of the following conditions occur for 4.3 out of 5 seconds.
• | The PCM commands the 2-3 SS valve ON, and the voltage input remains high, B+. |
• | The PCM commands the 2-3 SS valve OFF, and the voltage input remains low, 0 volts. |
• | The PCM illuminates the malfunction indicator lamp (MIL) for California emission vehicles. |
• | The PCM commands a soft landing to second gear. |
• | The PCM commands maximum line pressure. |
• | The PCM freezes shift adapts form being updated. |
• | The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame, California only, and Failure Records, California and Federal. |
• | The PCM stores DTC P0758 in PCM history. |
• | For California emissions, the PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes. |
• | A scan tool can clear the MIL/DTC. |
• | For California emissions, the PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring. |
• | For Federal emissions, the PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring. |
• | The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM. |
DTC P0758 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine. Refer to Shift Solenoid Valve State and Gear Ratio .
The numbers below refer to the step numbers on the diagnostic table.
This step tests the function of the 2-3 SS valve and the internal wiring harness.
This step tests the power to the 2-3 SS valve from the ignition through the fuse.
This step tests the ability of the PCM and the wiring to control the ground circuit.
This step measures the resistance of the automatic transmission (AT) wiring harness assembly and the 2-3 SS valve.
Step | Action | Value(s) | Yes | No | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls in Engine Controls - 6.0L | ||||||||||
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM. Was DTC P0753 or P1860 also set? | -- | Go to Step 3 | Go to Step 4 | ||||||||||
3 |
Refer to Wiring Repairs in Wiring Systems or Valve Body and Pressure Switch Replacement . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 4 | ||||||||||
Using the scan tool output control function, command the 2-3 SS valve ON and OFF three times while listening to the bottom of the transmission pan. Use a stethoscope if needed. Does the solenoid click when commanded? | -- | Go to Intermittent Conditions in Engine Controls - 6.0L | Go to Step 5 | |||||||||||
Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 6 | |||||||||||
6 | Repair the open or high resistance in the ignition 0 voltage circuit (CKT 1020) of the 2-3 SS valve. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | -- | ||||||||||
Does the test lamp illuminate when you command the shift solenoid ON and go out when you command the shift solenoid OFF? | -- | Go to Step 10 | Go to Step 8 | |||||||||||
8 | Is the test lamp always ON? | -- | Go to Step 10 | Go to Step 9 | ||||||||||
9 | Test the control circuit (CKT 1223) of the 2-3 SS valve for an open or short to voltage between the PCM connector C2 and the AT inline 20-way connector. Refer to Circuit Testing in Wiring Systems and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 11 | ||||||||||
10 |
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 12 | ||||||||||
11 | Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 6.0L. Did you complete the replacement? | -- | Go to Step 19 | -- | ||||||||||
Does the resistance measure within the specified values? | 19-31 ohms | Go to Step 14 | Go to Step 13 | |||||||||||
13 |
Does the resistance measure within the specified values? | 19-31 ohms | Go to Step 17 | Go to Step 18 | ||||||||||
14 | Using the DMM, measure the resistance between terminal B and a good ground. Does the resistance measure greater than the specified value? | 250 K ohms | Go to Step 16 | Go to Step 15 | ||||||||||
15 |
Do both readings measure greater than the specified value? | 250 K ohms | Go to Step 17 | Go to Step 18 | ||||||||||
16 | Measure the resistance between terminal B and all other terminals, except terminal A, E, and S of the J 44152 . Refer to Automatic Transmission Inline 20-Way Connector End View . Is the resistance between terminal B and any other terminal, except terminal A, E, and S less than the specified value? | 250 K ohms | Go to Step 17 | Go to Intermittent Conditions in Engine Controls - 6.0L | ||||||||||
17 | Replace the automatic transmission wiring harness assembly. Refer to Valve Body and Pressure Switch Replacement . Did you complete the replacement? | -- | Go to Step 19 | -- | ||||||||||
18 | Replace the 2-3 SS valve. Refer to Valve Body and Pressure Switch Replacement . Did you complete the replacement? | -- | Go to Step 19 | -- | ||||||||||
19 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 20 | Go to Step 2 | ||||||||||
20 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 6.0L | System OK |