P0779

Pressure Control Solenoid B Intermittent

Q: Is it safe to drive with P0779?

Usually yes for short trips, since the problem is intermittent — but harsh or slipping shifts stress the transmission, so don't ignore it.

Q: Can I just clear P0779?

It will clear, but an intermittent wiring or solenoid fault brings it back. Tracking down the loose or corroded connection is the real fix.

Transmission / pressure control Generic OBD-II Medium

What it means

P0779 means the transmission control module saw an intermittent fault in the pressure control solenoid "B" circuit — the signal drops out or goes out of range now and then rather than constantly. Because it comes and goes, the most common culprit is a loose or corroded connector or chafed wiring rather than the solenoid itself.

Medium

Can I keep driving? Usually drivable — the fault comes and goes, so shifting may be normal most of the time with occasional harsh or slipping shifts. Get it fixed before it becomes constant.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Occasional harsh, firm, or delayed shifts
Intermittent slipping or flaring between gears
Check-engine light that may come and go
Brief drops into limp mode that clear on restart

Common causes

Most likely first

Intermittent open or short in the solenoid B wiring or connectorLikely
Loose or corroded electrical connection at the solenoidCommon
Failing pressure control solenoid BCommon
Failed transmission control module (TCM)Less often

How to diagnose & fix

Work through it in order

Scan for codes and read freeze-frame data to capture the conditions when it sets.
Because the fault is intermittent, focus on the wiring — wiggle-test the harness and connector while watching for a signal drop.
Inspect the solenoid connector for corroded, spread, or backed-out pins and repair as needed.
Check transmission fluid level and condition, and test the solenoid's resistance against spec.
If wiring and solenoid are good, suspect the TCM. Clear and re-test with a road test.

FAQ

Quick answers

Is it safe to drive with P0779?+

Usually yes for short trips, since the problem is intermittent — but harsh or slipping shifts stress the transmission, so don't ignore it.

Can I just clear P0779?+

It will clear, but an intermittent wiring or solenoid fault brings it back. Tracking down the loose or corroded connection is the real fix.

Read & clear P0779 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX