Skip to main content
Diagnose/P1631
P1631Critical SeverityElectrical

GM: ECM/TCM control Code 31

What This Means

This GM manufacturer-specific code indicates an issue with the ECM/TCM control system. Code P1631 is specific to GM vehicles and requires manufacturer diagnostic procedures.

Common Symptoms

  • Check engine light on
  • Multiple system issues
  • Warning light activation
  • Driveability or emissions change

Common Causes

  • GM-specific ECM/TCM control component
  • Module failure
  • Wiring harness damage
  • Software/calibration issue
  • Connector corrosion

Estimated Repair Cost

$250 – $750
Parts and labor (varies by vehicle and location)
Difficulty:Professional

Need This Fixed?

Find certified mechanics near you who can diagnose and repair P1631.

Find a Shop Near You
Search Another Code

For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.