P0786
Shift Timing Solenoid A Range/Performance
Transmission — shift timing control
Generic OBD-II
Medium
What it means
P0786 means the "A" shift timing solenoid isn't performing within its expected range — the control module sees shifts happening later, slower, or less precisely than commanded. This solenoid helps time gear changes hydraulically, so a fault shows up as harsh, delayed, or poorly timed shifts. It affects shift quality, not whether the engine will start.
Medium
Can I keep driving? Usually driveable but shift timing may be off, giving harsh or delayed shifts — drive gently to a shop; it won't stop the engine from starting.
Common symptoms
What you'll notice
- Harsh, delayed, or poorly timed shifts
- Transmission slipping or dropping into limp mode
- Reduced acceleration
- Check-engine light on
Common causes
Most likely first
- Failed or sticking shift timing solenoid ALikely
- Low, dirty, or contaminated transmission fluid affecting solenoid responseCommon
- Damaged wiring or corroded connector in the solenoid circuitCommon
- Valve body wear or debris affecting hydraulic timingLess often
- Failed transmission control module (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note any other transmission codes stored with it.
- Check transmission fluid level and condition; service if low, dirty, or burnt.
- Inspect the solenoid wiring and connector for damage or corrosion.
- Measure and command the shift timing solenoid; replace if it responds slowly or is out of range.
- If the solenoid is good, inspect the valve body for wear or debris. Clear and road-test.
FAQ
Quick answers
Is it safe to drive with P0786?+
Short trips are usually fine, but poorly timed shifts stress the transmission. Have it diagnosed before it worsens.
Can I just clear P0786?+
It may clear briefly, but the range/performance fault returns until the solenoid, fluid, or valve body issue is corrected.
Related codes
Often seen with P0786
Read & clear P0786 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX