P0758 code meaning
Shift Solenoid B Electrical
Powertrain system Generic code P07xx codes Check engine light
What P0758 means
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.
P0758 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0758
- Check engine or transmission warning lamp
- Limp mode in a fixed gear, no upshifts
- Harsh shifts from maximum line pressure
Common causes of P0758
- Most likelyOpen or corroded wire or transmission pass-through connector
- PossibleSolenoid coil open or shorted
- PossibleInternal harness or electronic module in the transmission
- Less likelyModule driver faulty or valve supply missing
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Shift solenoidTransmission valve bodyTransmission wiringTransmission control module
What each part of P0758 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| 58 | The exact fault in that area. |
What to do next
- Note P0758 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0758
What does P0758 mean?
P0758 means "Shift Solenoid B Electrical". A shift solenoid is an electrically switched valve in the valve body. It is a generic code, so it means the same on every make.
Is it safe to drive with P0758?
Drive gently and only to a workshop. With P0758 the car can go into limp mode (reduced power) to protect itself.
Will P0758 fail an emissions test?
Yes, it can. P0758 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0758 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P0758 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.