P0758 – Shift Solenoid B Electrical (OBD2)
P0758 means "Shift Solenoid B Electrical". The control unit has detected an electrical fault in the shift solenoid circuit – an open, a short or a resistance outside the specification.
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P0758 quick summary
| Fault code | P0758 |
|---|---|
| Meaning | Shift Solenoid B Electrical |
| System | Powertrain (Engine & Transmission) |
| Vehicles | Generic OBD2 |
| Severity | High |
| Can I drive? | Carefully and only to a workshop. The gearbox may be stuck in one gear. |
| Repair cost | €80 – €2,000 |
How shift solenoids work
Shift solenoids direct hydraulic fluid in the valve body to select gears; these codes cover their circuits, performance and timing solenoids.
Each shift solenoid (A, B, C, D, E, F) opens or closes a passage in the valve body. The combination of active solenoids determines which gear is engaged. Shift timing solenoids control how quickly a shift happens.
Codes P0750–P0774 and P0972–P0999 report circuit faults, performance or stuck off, stuck on, electrical and intermittent faults; P0785–P0789 cover the shift timing solenoid.
A failed shift solenoid usually means some gears are missing, the gearbox stays in one gear or shifts harshly. Electrical faults are often in the internal harness or connector; mechanical faults are caused by dirty fluid.
On VAG vehicles (VW, Audi, Škoda, Seat, Cupra), VCDS and older VAG testers can show this code as the five-digit VAG code 17142 (P0758). Both numbers mean the same fault.
Symptoms of P0758
- Gearbox stuck in one gear (limp mode)
- Missing gears or wrong gear selection
- Harsh or delayed shifts
- Check Engine or gearbox warning
- Engine revs high at speed
Most common causes of P0758 (most likely first)
Mechanic's Pro Tip
If several solenoid codes appear at once, suspect the common feed – the internal harness or the gearbox connector – rather than multiple failed solenoids.
1.Faulty shift solenoid (open or shorted winding)
Most likely2.Damaged wiring or internal gearbox harness
Oil-soaked or chafed internal harnesses are common on automatic gearboxes.
3.Corroded or loose connector
4.Dirty or degraded fluid causing sticking
5.Valve body wear
6.Transmission control unit fault
Step-by-step diagnostic guide
- 1
Read codes
Read the transmission codes and note which solenoid is affected.
- 2
Measure resistance at the connector
Measure the shift solenoid resistance at the control unit or gearbox connector and compare with the specification. Then check the wiring for shorts to ground.
Multimeter: Shift and pressure solenoids typically read a few ohms up to about 15–30 Ω depending on design; "OL" means open, close to 0 Ω means shorted.
- 3
Check fluid
Check fluid level and condition.
- 4
Measure the solenoid
Measure the solenoid resistance at the gearbox connector and check for shorts to ground.
Multimeter: On/off shift solenoids often read about 10–30 Ω; check the specification.
- 5
Command the solenoid
Use the scan tool to activate the solenoid and listen for the click.
- 6
Repair and adapt
Replace the solenoid or harness, change fluid and filter, and run adaptations.
Frequently asked questions
Can I keep driving with P0758?
Carefully and only to a workshop. The gearbox may be stuck in one gear.
How much does it cost to fix P0758?
Typical repair costs are 80 € – 2000 €, depending on the cause and the vehicle. The most common fixes are: faulty shift solenoid (open or shorted winding); damaged wiring or internal gearbox harness; corroded or loose connector. Always confirm the cause with the tests above before buying parts.
Can a shift solenoid be replaced without removing the gearbox?
On many gearboxes yes – the solenoids are accessible after removing the oil pan. On some they are part of the mechatronic unit.
Why is my gearbox stuck in third gear?
Many gearboxes use a fixed gear as limp mode when a solenoid or sensor fails, so you can still drive to a workshop.
What is the difference between P0758 and similar codes?
P0758 belongs to a group of codes for the same component that differ in the type or location of the fault: P0755 – Shift Solenoid B Malfunction; P0756 – Shift Solenoid B Performance or Stuck Off; P0757 – Shift Solenoid B Stuck On; P0759 – Shift Solenoid B Intermittent; P0760 – Shift Solenoid C Malfunction; P0761 – Shift Solenoid C Performance or Stuck Off. The tests on this page apply to the whole group; the type of fault tells you where to start.
Related fault codes
This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.