DTC P0758 2-3 (B) Shift Solenoid Electrical 6.5L Diesel
Circuit Description
The 2-3 Shift Solenoid (2-3 SS ) Valve controls fluid acting on the 2-3 shift valves. The 2-3 SS Valve is a normally-open exhaust valve used with the 1-2 Shift Solenoid 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 PCM controls the 2-3 SS Valve by providing the ground path through circuit 1223.
When the PCM detects a continuous open or short to ground in the 2-3 SS valve circuit or the 2-3 SS Valve, then DTC P0758 sets. DTC P0758 is a type A DTC.
Conditions for Setting the DTC
| • | The ignition is ON. |
| • | No system voltage DTC P0560. |
| • | The PCM commands the 2-3 SS Valve On, and the voltage remains high ( B+ ). |
| • | The PCM commands the 2-3 SS Valve Off, and the voltage remains low ( 0 volts). |
| • | A fault is detected for 5 seconds. |
Action Taken When the DTC Sets
| • | The PCM commands an immediate landing to second gear. |
| • | The PCM commands maximum line pressure. |
| • | The PCM freezes 1-2 shift adapts from being updated. |
| • | The PCM inhibits TCC engagement. |
| • | The PCM illuminates the Malfunction Indicator Lamp (MIL). |
Conditions for Clearing the MIL/DTC
- The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
- A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.
- The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM
Diagnostic Aids
| • | Inspect the wiring for poor electrical connections at the PCM Inspect the wiring for poor electrical connections at the transmission 20-way connector. Look for the following conditions: |
| - | A bent terminal |
| - | A backed out terminal |
| - | A damaged terminal |
| - | Poor terminal tension |
| - | A chafed wire |
| - | A broken wire inside the insulation |
| • | When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change. |
| • | First diagnose and clear any engine DTCs or APP Sensor codes that are present. Then inspect for any transmission DTCs that may have reset. |
Refer to Shift Solenoid Valve State and Gear Ratio table.
Test Description
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 transmission internal wiring harness.
-
This step tests the power to the 2-3 SS Valve from the ignition through the fuse.
-
This step tests circuit 1223 for an open.
-
This step tests circuit 1223 for a short to ground.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||||||||
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Are DTCs P0753, P0758, and P1860 set? | -- | ||||||||
3 |
Did you find and correct a problem? | -- | -- | |||||||
Command the 2-3 SS Valve ON and OFF three times while listening to the bottom of the transmission pan. Use a stethoscope if necessary. Does the solenoid click when commanded? | -- | Refer to Diagnostic Aids | ||||||||
Is the test lamp on? | -- | |||||||||
6 | Repair the open or short to ground in the ignition feed circuit to the 2-3 SS Valve. Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
Is the measured resistance greater than the specified value? | 5ohms | |||||||||
Measure the resistance between C3-C6 and a known good ground. Is the measured resistance less than the specified value? | 1000ohms | |||||||||
9 | Inspect and repair circuit 1223 for an open or poor PCM connection. Refer to Electrical Diagnosis, Section 8. Did you find a problem? | -- | ||||||||
10 | Inspect and repair circuit 1223 for a short to ground. Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | ||||||||
11 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming , Section 6. Is the replacement complete? | -- | -- | |||||||
12 |
Is the resistance within the specified values? | 20-40ohms at 20°C (68°F) | ||||||||
13 |
Is the resistance within the specified value? | 20-40ohms at 20°C (68°F) | ||||||||
14 |
Use the J 39200 DVOM. Are both readings greater than the specified value? | 250kohms | Go to Diagnostic Aids | |||||||
15 | Inspect and repair the internal wiring harness for an open circuit. Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
16 |
Are both readings greater than the value shown? | 250kohms | ||||||||
17 | Inspect and repair the internal wiring harness for a short to ground. Refer to Electrical Diagnosis, Section 8. Did you find a problem and correct it? | -- | -- | |||||||
18 | Replace the 2-3 SS Valve. Refer to 4L80-E On-vehicle Service. Is the replacement complete? | -- | -- | |||||||
19 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
DTC P0758 2-3 (B) Shift Solenoid Electrical 4.3L, 5.7L, and 7.4L Gas
Circuit Description
The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls fluid acting on the 2-3 shift valve. The solenoid is a normally-open exhaust valve used with the 1-2 Shift Solenoid 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 VCM controls the 2-3 SS Valve by providing the ground path through circuit 1223.
When the VCM 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 D DTC. For California emissions vehicles, DTC P0758 is a type A DTC.
Conditions for Setting the DTC
| • | No system voltage DTC P0560. |
| • | The ignition is ON. |
| • | The VCM commands the 2-3 SS Valve On, and the voltage remains high ( B+ ). |
| • | The VCM commands the 2-3 SS Valve Off, and the voltage remains low ( 0 volts). |
| • | All conditions are met for 5 seconds. |
Action Taken When the DTC Sets
| • | The VCM commands an immediate landing to second gear. |
| • | The VCM commands maximum line pressure. |
| • | The VCM freezes shift adapts form being updated. |
| • | The VCM illuminates the Malfunction Indicator Lamp (MIL) for California emission vehicles. |
Conditions for Clearing the DTC
| • | For California emissions vehicles, the VCM turns OFF the MIL after three consecutive ignition cycles without a failure reported. |
| • | A scan tool can clear the DTC from the VCM history. The VCM clears the DTC from the VCM history if the vehicle completes 40 warm-up cycles without a failure reported. |
| • | The VCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the VCM. |
Diagnostic Aids
| • | Inspect the wiring for poor electrical connections at the VCM. Inspect the wiring for poor electrical connections at the transmission 20-way connector. Look for the following conditions: |
| - | A bent terminal |
| - | A backed out terminal |
| - | A damaged terminal |
| - | Poor terminal tension |
| - | A chafed wire |
| - | A broken wire inside the insulation |
| • | When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change. |
| • | First diagnose and clear any engine DTCs or TP Sensor codes that are present. Then inspect for any transmission DTCs that may have reset. |
Refer to Shift Solenoid Valve State and Gear Ratio table.
Test Description
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 transmission internal wiring harness.
-
This step tests the power to the 2-3 SS Valve from the ignition through the fuse.
-
This step tests circuit 1223 from the transmission 20-way connector to the VCM for an open.
-
This step tests circuit 1223 from the transmission 20-way connector to the VCM for a short to ground.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check (4.3L) or Powertrain On Board Diagnostic (OBD) System Check (5.7L and 7.4L) | |||||||
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Are DTCs P0753, P0758, and P1860 set? | -- | ||||||||
3 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
Command the 2-3 SS Valve ON and OFF three times while listening to the bottom of the transmission pan. Use a stethoscope if necessary. Does the solenoid click when commanded? | -- | Go to Diagnostic Aids | ||||||||
Is the test lamp on? | -- | |||||||||
6 | Repair the open or short to ground in the ignition feed circuit to the 2-3 SS Valve. Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
Is the measured resistance greater than the specified value? | 5ohms | |||||||||
Measure the resistance between C2-4 and a known good ground. Is the measured resistance less than the specified value? | 1000ohms | |||||||||
9 |
Refer to Electrical Diagnosis, Section 8. Did you find a problem? | -- | ||||||||
10 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | ||||||||
11 | Replace the VCM. Refer to VCM Replacement/Programming (Vehicle Control Module) , Section 6. Is the replacement complete? | -- | -- | |||||||
12 |
Is the resistance within the specified values? | 20-40ohms at 20°C (68°F) | ||||||||
13 |
Is the resistance within the specified value? | 20-40ohms at 20°C (68°F) | ||||||||
14 |
Are both readings greater than the specified value? | 250kohms | Go to Diagnostic Aids | |||||||
15 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
16 |
Are both readings greater than the value shown? | 250kohms | ||||||||
17 |
Refer to Electrical Diagnosis, Section 8. Did you find a problem and correct it? | -- | -- | |||||||
18 | Replace the 2-3 SS Valve. Refer to 2-3 Shift Solenoid Valve Replacement, in On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||
19 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | System OK |
