Powertrain, generic · Transmission

P0758 Shift Solenoid B Electrical

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Open or corroded wire or transmission pass-through connector
Solenoid coil open or shorted
Internal harness or electronic module in the transmission
Module driver faulty or valve supply missing

Symptoms

  • Check engine or transmission warning lamp
  • Limp mode in a fixed gear, no upshifts
  • Harsh shifts from maximum line pressure

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

shift solenoidtransmission valve bodytransmission wiringtransmission control module

Related codes

P0976P0977P0755P0759P0753

References: gsi.ext.gm.com, saabwisonline.com, saabwisonline.com, static.nhtsa.gov.