P0819 moderate

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.

My Garage →
Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$100 - $500 (parts and labor)
Check Your Fluid First
ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Read Transmission Codes
LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

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

Step-by-Step Diagnostic Procedure

  1. Compare shift switch inputs to transmission range sensor data on a scan tool

  2. Check the transmission range sensor adjustment

  3. Inspect wiring for both the shift switch and range sensor circuits

  4. Verify TCM software is at the latest calibration

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.

Sources

This page is built from documented references. Verify against your own service info before repair work.

Explore More

Search codes Vehicle-specific fixes Guides By make

Was this helpful?

Share carcodefinder.com with a friend who needs to decode their check engine light.

Browse by symptom → Read repair guides → Fixes by vehicle →