P2777 code meaning
Upshift Switch Circuit High
What P2777 means
P2777 is the over-voltage counterpart for the upshift switch. GM's 2023 twin-clutch TCM watches the TAPUP input and counts up a timer once it exceeds 4.774 V; after 150 ms above that limit, with supply voltage in the 8.75–18 V band, the code is logged as Type C, so no MIL. Ford's July 2024 OBD summary lists P2777 as out-of-window-high on the TR9070 upshift paddle. Because the released paddle already rests near the top of the range, an open signal circuit, a missing switch ground or a disconnected steering wheel plug pushes the reading over the limit quickly. A short to battery voltage is less common. P2776 is the opposite case, P2775 the implausible but in-range one. The paddle does nothing until the circuit is repaired.
P2777 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2777
- Upshift paddle without function
- Driver information message about manual shifting
Common causes of P2777
- Most likelyOpen signal or ground circuit, steering wheel connector loose
- PossibleBroken track in the clock spring
- Less likelySignal wire shorted to a voltage source
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Upshift switchWiring harness
What each part of P2777 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| 77 | The exact fault in that area. |
What to do next
- Note P2777 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2777
What does P2777 mean?
P2777 means "Upshift Switch Circuit High". P2777 is the over-voltage counterpart for the upshift switch. It is a generic code, so it means the same on every make.
Is it safe to drive with P2777?
P2777 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2777 fail an emissions test?
P2777 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2777 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P2777 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.