P0755 Code: Shift Solenoid B Malfunction
The TCM detects an electrical problem with shift solenoid B, the second on/off shift valve.
At a glance
Severity: Moderate
- Meaning
- Shift Solenoid B Malfunction
- System
- Transmission · Powertrain
- Safe to drive?
- With caution
- Typical repair cost
- $100–$1,200
- DIY difficulty
- Moderate
P0755 is the circuit code for shift solenoid B. Its job varies: on GM's 4L60E family it is the 2-3 shift solenoid (though GM usually reports its wiring faults as P0758), on Ford units it is SSB, and Chrysler's 41TE, 62TE and RFE transmissions use P0755 for the 2C (second-clutch) solenoid circuit. In every case the TCM saw a voltage on the solenoid B circuit that didn't match its command, so it can no longer trust that solenoid and switches to a failsafe gear. A useful clue is whether B failed alone: if A, B and C all report faults, the shared supply is the suspect; if only B is flagged, look at the B wire, its pin and the solenoid itself.
Can I keep driving? Drive gently and directly to a shop – the transmission will usually stay in one gear or skip several gears. Expect higher fuel use and engine speed on the highway until it's repaired.
How to read P0755
- P Powertrain
- 0 Generic (SAE)
- 7 Transmission
- 55 Specific fault
Symptoms
- Transmission locked in a single gear or skipping gears
- No 2-3 or 3-4 shift, depending on design
- Engine revs high at highway speed
- Noticeably worse fuel economy
- Harsh garage shifts into Drive
- Check engine light; problem appeared right after a pan or filter service in some cases
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Solenoid B coil open or shorted
- Damaged wire or pin in the solenoid B circuit
- Internal connector not seated or wire pinched after a recent pan service
- Fluid or corrosion in the case connector
- TCM driver fault
- Supply voltage or ground problem
Diagnosis step by step
Check which solenoid codes are stored
Read the TCM and see whether B is the only solenoid code. B alone points to its own wire, pin or coil; several solenoids at once point to the common power feed, fuse or TCM ground.
Tools: OBD-II scanner
Ask about recent transmission work
If the code appeared after a fluid and filter service, an internal connector may have been knocked loose or a wire trapped under the pan. That's worth checking before any parts are ordered.
Tools: Flashlight
Compare solenoid B with solenoid A
At the case connector, measure solenoid A and B, which on most transmissions are the same type of solenoid. They should read within a few ohms of each other and of the published spec; a big difference or an open reading on B confirms the coil or internal wiring.
Tools: Multimeter
Check for a short to ground
Measure from the solenoid B pin to the transmission case and from the harness side to chassis ground. Any continuity means a pinched or chafed wire that will keep blowing the circuit or setting the code.
Tools: Multimeter
Test the harness end to end
Check continuity of the solenoid B wire from the case connector to the TCM plug and look closely at the terminal tension of that pin. A loose terminal can pass a static meter test but fail while driving.
Tools: Multimeter, Flashlight
Confirm the TCM drives the solenoid
With everything else good, command solenoid B from the scan tool and watch its control wire switch. No switching with good wiring means a TCM fault.
Tools: OBD-II scanner, Multimeter
Where the parts are
- 1Battery
- 2Alternator
- 3Engine computer (ECM)
- 4CAN bus
- 5Transmission
- 6Wheel speed sensor
- 7High-voltage battery
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Reseat internal connector or free a pinched wire | No | $150–$350 |
| Repair harness or terminal | No | $100–$350 |
| Replace shift solenoid B | No | $250–$650 |
| Replace solenoid pack (units with a combined pack) | No | $450–$1,000 |
| Replace and program TCM | No | $500–$1,200 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Notes by brand
Dodge
On Dodge Grand Caravan, Journey and other models with the 41TE or 62TE, P0755 refers to the 2C solenoid circuit in the externally mounted solenoid and pressure switch assembly. The transmission defaults to 2nd gear limp mode when the fault is active.
Field data
| Kia | 2 | Spectra |
|---|
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.
Emissions / smog test impact
Will fail
With P0755 the check engine light stays on, so the car won't pass an OBD emissions or smog test. After the repair, drive until the readiness monitors are complete before retesting.
Frequently asked questions
What does shift solenoid B actually do?
It depends on the transmission. It may control the 2-3 shift, a specific clutch such as Chrysler's second clutch, or work in combination with solenoid A to select several gears. The repair manual for your transmission tells you which.
Can a fluid change cause P0755?
Not the fluid itself, but the work can. If the internal connector is bumped or a wire is trapped when the pan goes back on, an electrical solenoid code can appear right after the service.
Why compare solenoid A and B readings?
Most transmissions use identical on/off solenoids for A and B, so they should measure almost the same. Comparing them is a quick sanity check even if you don't have the exact factory spec at hand.
Is it safe to keep driving with P0755?
Short, gentle trips are usually possible because the transmission picks a failsafe gear. Long highway drives at high rpm and towing should wait until the repair is done.