Powertrain, generic · Computer and auxiliary outputs

P0613 TCM Processor

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0613 reports an internal processor or calculation fault in the transmission control module. It is usually set by the transmission module itself – the scan tool shows which module stored it; on some architectures the engine module reports it on the transmission module's behalf. The only manufacturer document found is Subaru's bulletin for the 2022 BRZ 2.4 L automatic: an internal plausibility check (a calculated gear ratio) set P0613 falsely in rare cases, and the fix was reprogramming the transmission module with improved self-diagnosis. Depending on the maker the transmission may go into limp mode with a fixed gear and harsh shifts. Check supply, ground and battery first, then look for a software update. The engine module's processor fault is P0606; an ECM/TCM mismatch is P0614.

Likely causes

Transmission module software (self-diagnosis triggers falsely)
Voltage dip, poor ground or supply at the transmission module
Interrupted or faulty programming
Internal hardware defect (moisture, overheating)

Symptoms

  • Check engine light or transmission warning
  • Transmission limp mode (fixed gear, harsh shifts)
  • Implausible shifting
  • Often no noticeable symptoms (sporadic false report)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission control modulecontrol module power supply

Related codes

P0606P0614P0631P0700P0601

References: law.cornell.edu, static.nhtsa.gov.