EV Diagnostics
Source-backed diagnostic reference

P1798 EV diagnostic code

CAN TCM INST Circuit Malfunction

Reference status: This page preserves source-backed code definitions for discovery. Manufacturer/model applicability, repair steps and safety conclusions are not treated as verified unless a manufacturer-specific verified report is available.

Reference definitions

  • JAGUAR: CAN TCM INST Circuit Malfunction Source
  • MAZDA: Coolant Temperature Circuit Source
  • NISSAN: Coolant Temperature Circuit Source
  • OTHER: Coolant Temperature Circuit Malfunction Source
  • VOLKSWAGEN: Output Speed Sensor 2 Circuit Range Performance Source

Search and canonical URL

Capitalization, underscores, hyphens, colons and spaces are normalized to this canonical code identity so alternate scan-tool formats do not create duplicate pages.