P0756: Shift solenoid B stuck off or performing poorly

Shift solenoid B performance / stuck off

Severity: Inspect soon

Kelley Blue Book rates P0756 exceedingly serious and says continued driving risks complete transmission failure, so it should be inspected promptly.

Source: how we rate severity

P0756 in short

P0756 means shift solenoid B, which controls part of the automatic transmission's shifting, seems to be stuck off. Low or dirty fluid is the most common cause, then wiring, the solenoid, the pump or blockages. The car may go into limp mode. Have it inspected soon; driving on risks transmission failure.

Shift solenoids are electric valves that direct fluid to apply the clutches for each gear. P0756 sets when solenoid B does not act as commanded and looks stuck off.

Kelley Blue Book lists low or dirty fluid as the most common cause, followed by frayed wiring, the solenoid or the pump, and blockages. A control module failure is rare. Typical signs are limp mode, harsh or erratic shifts and getting stuck in a gear.

Bulletins show the code can also come from deeper problems: GM has an information bulletin for 4L60E and 4L65E transmissions with P0756 for 2-3 shift valve performance, and Ford covers a 2015-2016 6F50/6F55 snap ring and hub failure with P0756 among the codes.

Most likely causes

Cause 1: Low or dirty transmission fluid
Common general cause
Why it ranks here
Kelley Blue Book says this is the most common cause.
What would change this
Rises if fluid is low or dark. Falls if normal.
Cause 2: Frayed or damaged wiring
Common general cause
Why it ranks here
Kelley Blue Book lists wiring damage and suggests inspecting it after fluid.
What would change this
Rises if the harness is chafed or connectors are corroded. Falls if intact.
Cause 3: Shift solenoid, valve body or pump problem
Common general cause
Why it ranks here
Kelley Blue Book lists solenoid, pump and blockage problems once fluid and wiring are ruled out; GM describes a 2-3 shift valve performance issue on 4L60E and 4L65E.
What would change this
Rises if fluid is clean and wiring good but the code returns. Falls if a fluid service clears it.
Cause 4: Direct clutch snap ring or hub failure (some 2015-2016 Ford/Lincoln 6F50/6F55)
Supported by vehicle data
Why it ranks here
Ford SSM 46069 covers lost reverse, 3rd and 5th gear with P0756 and/or P2701 on vehicles built in a short window.
What would change this
Rises on a covered build date. Falls on other vehicles.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

Step 1: Check the transmission fluid level and condition by the method in the owner's manual. Many transmissions have no dipstick; leave those to a shop.
Use cautionTool: transmission dipstick, if fitted
Warning:Run the check only as the owner's manual describes; the transmission is hot and has moving parts nearby.
- IfFluid is low, dark or burnt
  It meansFluid service or leak repair first.
  Points to: Low or dirty transmission fluid
- IfFluid looks normal
  It meansLook at the wiring and bulletins.
  Go to step 2
Step 2: Ask a dealer whether your VIN has a bulletin for P0756.
Low risk
- IfA 2015-2016 6F50/6F55 vehicle in the build window with lost gears
  It meansThe snap ring bulletin may apply.
  Points to: Direct clutch snap ring or hub failure (some 2015-2016 Ford/Lincoln 6F50/6F55)
- IfNo bulletin applies
  It meansHave a shop check the wiring and solenoid.
  Go to step 3
Step 3: Have a shop inspect the wiring, check solenoid B operation and the valve body.
Best left to a shop
Warning:Transmission work involves hot fluid and heavy, moving parts; leave this to a shop.
- IfWiring is damaged
  It meansRepair the harness.
  Points to: Frayed or damaged wiring
- IfWiring is good but the solenoid does not respond
  It meansThe solenoid or valve body is suspect.
  Points to: Shift solenoid, valve body or pump problem

Symptoms

Check engine light
Harsh or erratic shifts, stuck in a gear or limp mode Gets more serious: stop and have it checked.
Slipping in or out of gear
Poor fuel economy

How to fix

Step 1: Ask a dealer whether your VIN has an open bulletin for P0756.

On your vehicle

Lincoln

2015–2016 · MKX
Supported by vehicle data
Ford SSM 46069 covers some 2015-2016 MKX with 6F50/6F55 built in a short window with P0756 and/or P2701 and lost reverse, 3rd and 5th gear. Whether the bulletin is still current is not verified.

SSM 46069Status unverified
No reverse, 3rd and 5th gear with P0715, P0717, P0756 and/or P2701
2015–2016mkx · NHTSA 10109063
Direct clutch snap ring or hub damage; replace tone wheel and related parts. Only the NHTSA summary was read.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

All Transmission codes

Sources and review

P0756 OBD-II Trouble Code: Shift Solenoid B Performance/Stuck Off — Kelley Blue Book
GM bulletin 151001: 4L60E/4L65E P0756, 2-3 shift valve performance — General Motors / NHTSA
Ford SSM 46069: No reverse, 3rd and 5th gear with P0715, P0717, P0756 and/or P2701 — Ford Motor Company / NHTSA

Last reviewed: October 15, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

Severity: Inspect soon

Most likely causes

Cause 1: Low or dirty transmission fluid

Cause 2: Frayed or damaged wiring

Cause 3: Shift solenoid, valve body or pump problem

Cause 4: Direct clutch snap ring or hub failure (some 2015-2016 Ford/Lincoln 6F50/6F55)

What to test first

Step 1: Check the transmission fluid level and condition by the method in the owner's manual. Many transmissions have no dipstick; leave those to a shop.

Step 2: Ask a dealer whether your VIN has a bulletin for P0756.

Step 3: Have a shop inspect the wiring, check solenoid B operation and the valve body.

Symptoms

How to fix

On your vehicle

LincolnYour car

Related codes

Sources and review

Lincoln