What P0759 means
A shift solenoid is an electrically switched valve in the valve body.
How the engine computer detects it
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). P0759 is an intermittent fault of solenoid B: the feedback briefly shows a fault and then recovers. No manufacturer document available to us uses this code: Ford watches its solenoid circuits continuously under the open and short codes, GM counts failures over a window (more than 43 of 50) under P0758. Brief dropouts make the module switch the solenoid off and enter limp mode until the next start.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
Symptoms
- Limp mode or jolt at times, then normal again
- Warning lamp comes and goes
Common causes
- Loose contact or corrosion at the transmission connector Most likely
- Chafed harness, dependent on temperature or vibration Possible
- Coil with heat-dependent winding fault Less likely
How to diagnose P0759
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: shift solenoid, transmission valve body, transmission wiring, transmission control module.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Reading the code
- P
- Powertrain
- 0
- Generic (SAE) code
- 7
- Transmission
- 59
- Specific fault
Questions drivers ask
Can I drive with code P0759?
If the car shifts normally, drive gently to a shop. If it's stuck in one gear, slips, shifts harshly or won't move out of Park, don't drive it: have it towed.
Will my car pass an emissions inspection with P0759?
Probably not in states that test vehicles with an OBD-II scan: an emissions-related code that keeps the check engine light on is usually an automatic fail. Rules differ by state and county, so check yours.
Will P0759 clear by itself?
The light can go off after several drive cycles without the fault, but the code returns if the cause is still there. After a repair, the readiness monitors need a full drive cycle before an inspection.
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.