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P0755 — Shift Solenoid B

Generic OBD-II · all makesPowertrain (engine & transmission)

P0755 indicates a malfunction in the transmission shift solenoid B circuit. The powertrain control module (PCM) has detected an abnormal voltage or resistance condition that prevents proper operation of this solenoid.

Symptoms

What causes it — most likely first

1. Faulty shift solenoid B

The solenoid coil or internal contacts have failed, causing an open or short circuit.

2. Wiring harness damage

Frayed, corroded, or broken wires or connectors in the solenoid B circuit create high resistance or intermittent signals.

3. Transmission fluid issues

Low, dirty, or incorrect fluid can cause the solenoid to overheat or stick, leading to erratic operation.

4. PCM output driver failure

A rare internal fault in the PCM's driver circuit can prevent it from sending proper voltage to solenoid B.

How it's diagnosed

  1. Verify the Check Engine Light and retrieve any related transmission codes.
  2. Inspect the shift solenoid B wiring and connectors for damage, corrosion, or loose pins.
  3. Measure the supply voltage and ground resistance at the solenoid connector while the PCM commands a shift.
  4. Test the solenoid coil resistance against specification; replace if out of range.
  5. Check transmission fluid level, condition, and correct type; replace or flush if necessary.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationSAE generic — identical on every make
Related codesP0750 — Shift SolenoidP0751 — Shift Solenoid Performancestuck OffP0752 — Shift Solenoid StuckP0753 — Shift Solenoid ElectricalP0754 — Shift Solenoid IntermittentP0756 — Shift Solenoid B Performancestuck Off

Frequently asked

Do I need to replace the PCM for a P0755 code?

Almost always no. The PCM is rarely the cause; the solenoid, wiring, or fluid are far more common culprits. Replace the PCM only after all other possibilities have been ruled out.

Can a bad transmission fluid cause this code?

Yes. Low or contaminated fluid can cause the solenoid to overheat or stick, leading to abnormal electrical readings that trigger P0755.

Will the transmission go into limp mode with this fault?

If the PCM determines the solenoid cannot be controlled, it may place the transmission in a reduced‑performance or limp mode to protect the drivetrain.

Is it safe to drive with a P0755 code present?

Driving is possible but may result in rough shifting, loss of power, or eventual transmission damage. It's advisable to diagnose and repair the issue promptly.