P0758

Shift Solenoid "B" Electrical

Severity: High
Driving: Drive only to a garage

An electrical fault in the circuit for shift solenoid "B" - an open winding, a short to earth or voltage, or resistance outside specification. The module cannot drive the solenoid, so it will drop into a failsafe and hold one gear.

Possible causes

CommonOpen or shorted solenoid winding
CommonCorroded transmission case connector, or fluid wicking into it
CommonInternal transmission harness failure
PossibleWiring damage between the module and the transmission
RareFailed transmission control module driver

What you might notice

Transmission stuck in one gear
No shifting
Harsh engagement
Several solenoid codes stored at once
Check engine light on

What to check, in order

Read all transmission codes first. Several solenoid electrical codes together point at the case connector or the internal harness, not at several failed solenoids.
Pull the transmission case connector and look for fluid inside it. Fluid tracking up the harness corrodes the pins and can eventually reach and destroy the control module.
Measure the solenoid resistance at the case connector against specification.
Check the harness between the module and the transmission for chafe damage.
Check the fluid level and condition while the vehicle is raised.
Do not order a control module until the connector, harness and solenoid have all been measured.

Read this code from your own car

Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.

Get Pin16 on Google Play

Where this code sits

B · Body C · Chassis P · Powertrain U · Network and communication