OBD codes / P0750
P0750
SeriousShift Solenoid A Malfunction
Usually drivable in the short term — often in limp mode, which is safe but high-revving and joyless. Keep speeds moderate, skip towing, and don't sit on the code for weeks: driving around in the wrong gear builds heat, and if sticky fluid is the root cause it's also gumming everything else.
What this code means
Automatic transmissions select gears by energizing shift solenoids in combinations — solenoid A on or off, B on or off, and so on — each combination routing fluid to different clutches. P0750 means solenoid A's circuit or function has a general malfunction: the computer commands it and either the circuit tests wrong or the transmission's behavior says the solenoid didn't do its job. Which gears you lose depends on the transmission, since every design maps its solenoids differently, but the typical experience is missing shifts, being locked out of certain gears, or limp mode. The fault can be electrical (coil, wiring, connector) or hydraulic (the solenoid mechanically sticking, often from debris in old fluid) — which is why fluid condition is checked first and an electrical test comes right after.
Symptoms you might notice
- Missing one or more gears, or shifts happening at the wrong times
- Harsh or delayed shifts
- Limp mode (held in a single gear)
- Higher RPM than expected at speed
- Check-engine light
What it costs to fix
Typical range: $80–$600 · about ~0.5–3 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Shift solenoid A | $30–$150 | ~0.5–3 hrs |
| Wiring / connector repair | $10–$120 | ~0.5–1.5 hrs |
| Fluid and filter service | $80–$250 | ~0.5–1.5 hrs |
Shift solenoids are cheap parts with wildly variable labor: on some transmissions they sit just inside the pan and swap in under an hour; on others the valve body must come out — or the solenoids come only as an assembly, raising the parts bill. Confirm your transmission's layout before comparing quotes.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0750 for my exact vehicle →
Frequently asked
Which gears does shift solenoid A control?
It depends entirely on the transmission — each design maps solenoid combinations to gears differently, so there's no universal answer. What you'll notice is the pattern: certain shifts missing or wrong. A technician with the shift-logic chart for your transmission can tell exactly which gear changes solenoid A participates in.
Is this an electrical or a mechanical problem?
P0750's general 'malfunction' wording covers both, so testing decides: if the coil or wiring fails a resistance check, it's electrical; if the circuit tests fine but the shifts still misbehave, the solenoid or valve body is sticking hydraulically — where old, dirty fluid is a prime suspect.
Could a fluid change fix a solenoid code?
Sometimes, genuinely — solenoids have tiny passages and valves that varnish and debris can jam, and fresh fluid plus a new filter can free them. It's the cheapest first move. If the solenoid is electrically dead or mechanically worn, though, it needs replacing regardless of fluid.
Solenoid replacement or rebuild — how do I know?
A solenoid code with clean fluid and good line pressure is usually just a solenoid — a modest repair. Rebuild territory announces itself differently: burnt fluid, friction material in the pan, slipping in multiple gears. Don't let anyone jump from a single solenoid code to a rebuild quote without that evidence.
Seeing P0750 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0750 for my vehicleSymptoms that trigger P0750
Drivers who get this code often notice one of these — each has its own likely-causes and cost guide:
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0750 from your phone — see our honest guide to the best OBD2 Bluetooth adapters.
Generic OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.