P0758Shift Solenoid B Electrical
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- A shift solenoid is an electrically switched valve in the valve body. Manufacturers use these codes differently: Ford reports an open circuit with the base code and shorts separately, newer GM units have separate low/high codes, and the letter is not tied to a valve number (Saab's 9-5: A = valve S2). P0758 is the collective electrical code for solenoid B. GM's older 4-speeds flag open or short to ground at more than 43 of 50 failed counts; Subaru compares the driver transistor voltage for 30 ms, lights the MIL after two trips and holds third gear; on Saab's 5-speed Aisin box B is valve S3, checked by current; Hyundai's 8-speed uses it for the proportional valve of the 2-6 brake. Ford and newer GM do not use P0758.
- What you may notice
- Check engine or transmission warning lamp
- Limp mode in a fixed gear, no upshifts
- Harsh shifts from maximum line pressure
- Likely causes
- LikelyOpen or corroded wire or transmission pass-through connector
- PossibleSolenoid coil open or shorted
- PossibleInternal harness or electronic module in the transmission
- RareModule driver faulty or valve supply missing
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.