Up and Down Shift Switch to Transmission Range Correlation
The P0819 code means the vehicle's onboard diagnostic system has detected: Up and Down Shift Switch to Transmission Range Correlation. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $500 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light illuminated
- Manual shift mode does not match expected gear
- Transmission may not respond to manual shift inputs
- Erratic shifting when using sport or manual mode
Probable Causes (Ranked by Likelihood)
- Misadjusted or faulty transmission range sensor Very High
- Shift switch input not matching range sensor position High
- Wiring fault in shift switch or range sensor circuit Moderate
- TCM correlation logic error requiring software update Low
Frequently Asked Questions
What does correlation mean in P0819?
Correlation means the TCM compares signals from two sources. In this case, the shift switch input does not agree with the transmission range sensor position, indicating a mismatch.
Can a software update fix P0819?
In some cases, a TCM software update can correct correlation logic issues. Check with your dealer for applicable technical service bulletins.
Should I replace both the shift switch and range sensor?
Not necessarily. Diagnose which component is giving the incorrect reading first. Replacing only the faulty component will save money.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Compare shift switch inputs to transmission range sensor data on a scan tool
-
Check the transmission range sensor adjustment
-
Inspect wiring for both the shift switch and range sensor circuits
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Verify TCM software is at the latest calibration
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2010-2020 Chevrolet Equinox
- 2008-2018 GMC Terrain
- 2011-2019 Ford Explorer
- 2009-2017 Dodge Journey
Related Codes
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