Upshift Switch Circuit
What does P0815 mean?
The P0815 code means the vehicle's onboard diagnostic system has detected: Upshift Switch Circuit. This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- Manual upshift paddle or button does not work
- Transmission stays in manual mode or automatic mode only
- Sport or manual shift mode unavailable
Probable Causes (Ranked by Likelihood)
- Faulty upshift paddle or switch Very High
- Wiring issue in upshift switch circuit High
- Steering column clock spring failure affecting paddle signals Moderate
- TCM input circuit fault Low
Step-by-Step Diagnostic Procedure
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Use a scan tool to monitor upshift switch input while pressing the paddle
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Inspect the steering column wiring and clock spring connector
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Test continuity of the upshift switch circuit from paddle to TCM
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Check for related steering wheel control DTCs
Frequently Asked Questions
Can I still drive in automatic mode with P0815?
Yes, the transmission will still function in fully automatic mode. Only the manual upshift feature is affected.
Could the clock spring be the problem?
Yes, the clock spring in the steering column carries signals from the paddle shifters. If it fails, it can interrupt the upshift signal along with other steering wheel controls.
Are paddle shifter replacements expensive?
The paddle switch itself is typically $50 to $150 for the part. If the clock spring is the cause, the part is $100 to $300 plus labor.