Faulty shift solenoid 'B' itself, such as a burned coil or stuck plunger.; Damaged or corroded wiring in the solenoid circuit, including chafed insulation or broken wires.; Loose or corroded electrical connector at the solenoid or transmission case pass-through.; Transmission fluid contamination or low fluid level causing solenoid malfunction.; Failed transmission control module (TCM) or internal driver circuit, though this is less common.; Valve body issues that mechanically bind the solenoid, leading to electrical feedback.

DTC codes / P07xx · Transmission / P0755

P0755Shift Solenoid 'B'

Q: What does code P0755 mean?

Shift Solenoid 'B'. P0755 indicates that the transmission control module has detected an electrical fault in the circuit for shift solenoid 'B', which is one of the solenoids that controls hydraulic pressure to shift gears. The computer monitors the solenoid's electrical current and sets this code when the current is outside the expected range, either too high (short to ground) or too low (open circuit or short to power).

P0755 indicates that the transmission control module has detected an electrical fault in the circuit for shift solenoid 'B', which is one of the solenoids that controls hydraulic pressure to shift gears. The computer monitors the solenoid's electrical current and sets this code when the current is outside the expected range, either too high (short to ground) or too low (open circuit or short to power).

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Symptoms you may notice

The check engine light or transmission warning light is illuminated.
The transmission may shift harshly or flare between gears, especially when changing from second to third or third to fourth.
The transmission may stick in a single gear or enter limp mode, limiting vehicle speed.
Delayed or erratic engagement when shifting from park to drive or reverse.
Often no symptoms besides the warning light, especially if the fault is intermittent.

Common causes, most likely first

Faulty shift solenoid 'B' itself, such as a burned coil or stuck plunger.
Damaged or corroded wiring in the solenoid circuit, including chafed insulation or broken wires.
Loose or corroded electrical connector at the solenoid or transmission case pass-through.
Transmission fluid contamination or low fluid level causing solenoid malfunction.
Failed transmission control module (TCM) or internal driver circuit, though this is less common.
Valve body issues that mechanically bind the solenoid, leading to electrical feedback.

How to diagnose and fix it

Check transmission fluid level and condition; top off or replace fluid if contaminated.
Inspect the solenoid 'B' electrical connector and wiring for damage, corrosion, or looseness; clean and repair as needed.
Measure the resistance of solenoid 'B' with a multimeter and compare to the manufacturer's specification; replace if out of range.
Test the solenoid circuit for shorts to ground or power using a multimeter and wiring diagram.
If the solenoid is internal, remove the transmission pan and test the solenoid directly; replace if faulty.
Clear the code and test-drive the vehicle to verify the repair; if the code returns, perform advanced diagnostics with a scan tool to monitor solenoid operation.

Before you replace the shift solenoid

A loose or corroded connector at the transmission case pass-through is a frequent cause of P0755 that is often overlooked during diagnosis.
Low or dirty transmission fluid can cause solenoid 'B' to stick or draw excessive current, setting the code without a failed solenoid.
The code can be set by a shorted wiring harness where it rubs against a sharp edge, so always inspect the entire circuit, not just the solenoid.
On some vehicles, a faulty ignition switch or poor ground can mimic a solenoid circuit fault, so check powers and grounds before condemning the solenoid.
Replacing the solenoid without addressing contaminated fluid or a damaged valve body often leads to a repeat failure.

Can I keep driving with P0755?

You can usually drive the vehicle with P0755 set, but the transmission may shift harshly or enter limp mode, so avoid aggressive acceleration and highway speeds. Have the fault diagnosed soon to prevent further transmission damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.