P0780 means Shift Error. The transmission did not complete a shift the way the computer commanded, based on the speed sensor readings during the shift. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0780 means
Electronically controlled automatics are run by a transmission control module (TCM), a separate box or part of the engine computer. It reads speed sensors, the range sensor and fluid temperature to decide when to shift, and drives solenoids that apply clutches and the torque converter clutch. Many basic code readers only show the generic P0700; a scan tool that reads the transmission module shows the specific fault. Check fluid level and condition first, since low or burnt fluid causes many transmission codes.
P0780 symptoms
- Harsh, late or missing shifts
- Engine speed flaring during shifts
- Limp mode on some vehicles
Common causes of P0780
- Low or degraded fluid
- Worn clutches or bands
- Shift solenoid or valve body faults
- Speed sensor problems
How to diagnose P0780
- Check transmission fluid level and condition first
- Read all stored transmission codes for the specific gear or component
- Watch gear ratio data during shifts
- Check solenoids and line pressure
Can you drive with P0780?
Only as needed; repeated slipping shifts wear clutches quickly.
P0780 tips
A shift error code is a summary: the specific fault is often stored as another code. Read the full transmission code list, including pending codes.
Will P0780 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0780 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0730 | Incorrect Gear Ratio |
| P0750 | Shift Solenoid A Malfunction |
| P0894 | Transmission Component Slipping |
Guides that help
When it is more than a sensor
If the fault turns out to be internal (worn clutches, a failed converter or a damaged valve body), compare a rebuild with a replacement in transmission rebuild vs replacement and transmission replacement cost, identify your unit with what transmission do I have?, and browse our transmissions.
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