Powertrain, generic · Transmission

P0755 Shift Solenoid B

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
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). P0755 is the general code for solenoid B, used in practice like P0750 for an open circuit: Ford flags driver feedback disagreeing with the command for 0.5–5 s, with shorts as P0976/P0977; on Ford's 6R80 solenoid B is the proportional valve of the clutch for third, fifth and reverse. Ram's 6.7 L calls it 'control circuit open'. GM uses P0758 or P0976/P0977 instead. The transmission enters limp mode with harsh shifts.

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€80–600
Time0.5–3 h

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

What to check first

  1. Check fluid condition
  2. Measure solenoid resistance
  3. Inspect connector at the transmission

Parts involved

shift solenoidtransmission valve bodytransmission wiringtransmission control module

Related codes

P0758P0976P0977P0756P0750

References: newtonnet.co.uk, fordservicecontent.com, static.nhtsa.gov, law.cornell.edu.