What Does P0815 Mean?
The Upshift Switch Circuit has a malfunction. This switch is used on vehicles with tiptronic, manumatic, or paddle-shift transmissions to allow the driver to manually command an upshift. The PCM or TCM has detected that the upshift switch circuit is not functioning correctly — the signal may be stuck, open, or not responding to driver input.
Common Causes
35%
Failed upshift switch or paddle shifter
25%
Open or shorted wiring in the upshift switch circuit
15%
Clockspring failure affecting paddle shifter signal (steering column mounted)
15%
Corroded or damaged connector at the shifter or steering column
10%
TCM input circuit fault for the upshift signal
Diagnostic Steps
1
Monitor the upshift switch PID on the scan tool while pressing the upshift button/paddle — the signal should toggle on each press.
2
If the vehicle has steering wheel paddle shifters, check the clockspring/spiral cable for proper operation (other steering wheel controls may also be affected).
3
Test the upshift switch with a multimeter for proper continuity when pressed — resistance should change from open to closed.
4
Inspect wiring from the switch to the TCM, paying attention to areas of movement (steering column, shifter mechanism).
5
If the switch is on the shift lever, check for spilled drinks or debris that may have fouled the switch contacts.
Estimated Repair Cost
$50 - $500
Parts + labor, varies by vehicle and location
The Upshift Switch Circuit has a malfunction. This switch is used on vehicles with tiptronic, manumatic, or paddle-shift transmissions to allow the driver to manually command an upshift. The PCM or TCM has detected that the upshift switch circuit is not functioning correctly — the signal may be stuc...
The most common cause of P0815 (Upshift Switch Circuit) is: Failed upshift switch or paddle shifter
Typical repair costs for P0815 range from $50 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. The transmission will still shift automatically in drive mode. Manual upshift capability will be unavailable. If both upshift and downshift are lost, engine braking control on hills may be reduced — use brakes accordingly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0815 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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