OBD-II Generic Error Code P0815: Upshift Switch Circuit – How to Fix It
Medium 30 minutes to 1 hour Medium Severity
Verified June 2026
- Error Code
- P0815
- Brand
- OBD-II Generic
- Product Type
- automotive
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30 minutes to 1 hour
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Tools You'll Need
- OBD2 scanner
- Multimeter
- Contact cleaner
- Wire repair kit
- Screwdrivers
How to Fix Error Code P0815
-
Check for Additional Codes
-
Inspect the Upshift Switch Wiring and Connector
Disconnect the battery before working on electrical components. -
Test the Upshift Switch with a Multimeter
-
Check for Short or Open in the Circuit
-
Test the TCM Output (Advanced)
Backprobing risks damaging connectors; use proper tools.
Parts You May Need
Upshift switch
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Wiring harness/connector
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Upshift switch
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Wiring harness/connector
Check Price on Amazon
Upshift switch
Check Price on Amazon
Wiring harness/connector
Check Price on Amazon
Upshift switch
Check Price on Amazon
Wiring harness/connector
Check Price on Amazon
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When to Call a Professional
If you've checked the switch and wiring but the code returns, or if you're uncomfortable testing TCM signals, take your vehicle to a qualified mechanic. TCM replacement requires reprogramming.Frequently Asked Questions
What does error code P0815 mean?
P0815 indicates a fault in the upshift switch circuit, which tells the transmission control module when the driver wants to shift to a higher gear.
Can I drive with a P0815 code?
Yes, but it may cause poor shifting or limp mode. It's best to diagnose and fix it promptly to avoid transmission damage.
Is the upshift switch the same as the shifter?
The upshift switch is typically a button or part of the shift lever (e.g., on the steering wheel or gearshift) used for manual shifting.