P0760 and P0761: shift solenoid C circuit and performance

Two solenoids give four combinations and therefore up to four gears. Add a third and you get eight — which is how gearboxes moved from four speeds to six and beyond without a proportional increase in hydraulic complexity.

Code	Meaning
P0760	Shift solenoid C malfunction
P0761	Performance or stuck off
P0762	Stuck on
P0763	Electrical fault

The full method, which applies identically here: P0751 and P0752 shift solenoid A and P0755 to P0757 shift solenoid B.

Why a third solenoid removes more gears

With three solenoids, each is involved in roughly half the available combinations. One stuck in a single state therefore takes out about half the gears.

The practical symptom: a gearbox that shifts between a limited set of ratios and refuses the rest, often with a large RPM jump where a missing gear should be.

Mapping which gears work is still the fastest first step, and it costs nothing but a drive.

The multi-code case

On a six or eight-speed gearbox it is common to see several solenoid codes together — A, B and C all reporting.

Three solenoid codes rarely means three failed solenoids. Suspect:

• The internal harness, where fluid has wicked through a hardened case connector seal and reached the wiring for all of them.
• The connector itself, corroded or contaminated.
• A shared ground or supply.
• Fluid contamination affecting the whole solenoid pack equally.
• Line pressure, since none of them can work without it: P0745 to P0747 pressure control solenoid A.

Chasing them individually wastes time. Look for the shared cause.

Fluid, again

It is the same answer as for every other solenoid code, and it stays the same answer because it is true.

Solenoids have fine clearances and small screens. Fluid carrying clutch material and varnish blocks them. Fluid that is low lets the pump draw air and pressure collapse.

On modern gearboxes with no dipstick, the level is checked at a specified fluid temperature — which requires a working temperature sensor and the proper procedure: P0710 to P0713 transmission fluid temperature sensor and automatic transmission ATF diagnostics.

Reading it from the driver’s seat

Before any tool, note:

1. Which gears engage and which are skipped.
2. Whether it is temperature dependent — cold-only or hot-only tells you a great deal.
3. Whether it is load dependent — fine gently, fails under acceleration.
4. Whether a restart clears it temporarily.

Hot-only faults point at fluid and wear. Cold-only points at solenoids sticking before the fluid thins. Load-dependent points at pressure.

What to log

Commanded gear, actual gear, engine RPM and vehicle speed, through a full acceleration and a full deceleration.

Observation	Meaning
A gear is commanded and never arrives	Solenoid or pressure
RPM steps to the wrong level	Wrong gear engaged
RPM climbs without speed	Slip, not solenoid
Downshifts fail but upshifts work	Different combination affected

That last row is worth checking deliberately. Downshifts use different solenoid states, and testing only acceleration misses half the picture.

Transmission not shifting diagnosis.

The economics

The order of cost, lowest first: fluid and filter service, solenoid pack, valve body, rebuild.

Each of the first three resolves a meaningful share of these codes. Skipping to the last is how people pay for a rebuild on a gearbox that needed a solenoid.

How to read a workshop quote and gears slipping on an automatic.

Where to start

1. Map working and missing gears, both up and down.
2. Note temperature and load dependency.
3. Check fluid level and condition.
4. Read the transmission module — several codes usually share a cause.
5. Inspect the external connector for fluid.
6. Drop the pan for the solenoid pack and the filter.
7. Reset adaptations afterwards.

Pair an ELM327 adapter, open the free tier of the app and log commanded gear against actual gear through both acceleration and deceleration. Half the diagnosis lives in the downshifts most people never test.