P2782
Downshift Switch Circuit Intermittent/Erratic
Transmission controls
Generic OBD-II
Medium
What it means
P2782 means the downshift-switch signal is intermittent or erratic — the transmission controller is seeing the driver's downshift-request switch drop out or jump around. The car usually still drives, but manual downshifts may be ignored or shifts may feel unpredictable. It does not cause a no-start.
Medium
Can I keep driving? Usually yes, but shifting can feel erratic — the transmission may downshift unexpectedly or ignore manual downshift requests until fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Manual / paddle downshift requests ignored or acted on erratically
- Unexpected or harsh downshifts
- Transmission occasionally slow to respond to shift input
Common causes
Most likely first
- Intermittent fault inside the downshift (up/down) switchLikely
- Loose, corroded, or chafed wiring/connector at the switchCommon
- Moisture or spilled liquid in the switch or connectorCommon
- Poor ground or intermittent open in the circuitLess often
- Faulty transmission/powertrain control module (rare)Less often
How to diagnose & fix
Work through it in order
- Scan for freeze-frame and any related range or shift codes.
- Inspect the shift-switch connector and wiring for corrosion, moisture, or loose pins — wiggle-test for intermittents.
- Dry and clean the switch/connector if liquid intrusion is found.
- Back-probe the switch signal while operating it to catch the erratic reading.
- Repair wiring or replace the switch, then clear and road-test.
FAQ
Quick answers
Is it safe to drive with P2782?+
Generally yes for short trips, but erratic downshift signals can trigger unexpected gear changes. Have it checked soon if shifting feels unpredictable.
Can I just clear P2782?+
An intermittent fault will return; clearing it without repairing the switch or wiring only hides it temporarily.
Related codes
Read & clear P2782 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