P0758

Circuit Description
- The shift solenoid B is a simple on/oft solenoid located in the main case valve body. It is normally open. When the port is open, fluid pressure actuates the shift valve. In first or second gear, the Powertrain Control Module (PCM) energizes the solenoid to close a fluid inlet port.
- The solenoid is activated by current. This current is produced by applying a voltage to one side (the High side) and a ground to the other side (Low side).
- The High Side Driver (HSD) is a circuit of the PCM that acts as a switch between the solenoids and the supply voltage. The High side of the solenoid is permanently supplied with voltage. In BACKUP MODE or when the ignition is oft, the HSD is turned oft.
This DTC detects a continuous open or short to ground in the shift solenoid B circuit or shift solenoid B. This is a type "B" DTC.

Conditions For Setting The DTC
- Ignition is "on", Engine "run".
- Battery voltage is between 10 and 16 volts.
- The PCM commands the solenoid "on" and the voltage remains high (B+), or the PCM commands the solenoid "off" and the voltage remains low (zero volts).
- All conditions met for 0.33 seconds.

Action Taken When The DTC Sets
- Fixed to 4th gear.
- Maximum line pressure.
- Inhibit TCC engagement.
- The PCM will illuminate the Malfunction Indicator Lamp (MIL) and CHECK TRANS Lamp.

Conditions For Clearing The MIL/DTC
- The PCM will turn oft the MIL and CHECK TRANS Lamp after three consecutive ignition cycles without a failure reported.
- The DTC can be cleared from the PCM history by using a scan tool.
- The DTC will be cleared from history when the vehicle has achieved 40 warmup cycles without a failure reported.
- The PCM will cancel the DTC default actions when the fault no longer exists and the ignition is cycled "off" long enough to power down the PCM.

Diagnostic Aids
- Inspect the wiring for poor electrical connections at the PCM and at the transmission 16-way connector. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for a chafed wire that could short to bare metal or other wiring. Inspect for a broken wire inside the insulation.
- When diagnosing for a possible intermittent short or open condition, move the wiring harness while observing test equipment for a change.

Test Description
The numbers below refer to the step numbers on the diagnostic chart:
5. This test measures the resistance of the component.
7. This test checks the function of the shift solenoid B and the transmission internal wiring harness.
11. This test checks for power to the shift solenoid B from the ignition through the PCM.





Shift Solenoid Status Chart











DTC P0758 Shift Solenoid B Electrical