Automatic transmission code P0613 (2022 BRZ TCM update)
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What causes "Automatic transmission code P0613 (2022 BRZ TCM update)" on the Toyota GR86 / Subaru BRZ (ZN8/ZD8, 2022+), and how is it fixed?
In rare cases the transmission computer detects an inaccurate gear ratio. Fix: Dealers reprogram the TCM under Subaru bulletin 16-138-22.
Symptoms
A warning light with code P0613 (TCM processor) on a 2022 automatic BRZ.
Cause
In rare cases the transmission computer detects an inaccurate gear ratio. Subaru's update improves the self-diagnostic logic.
Fix (summary)
Dealers reprogram the TCM under Subaru bulletin 16-138-22. The new logic went into production from VIN N9702458. Toyota GR86 coverage not confirmed.
Related build entries
Other ZN8/ZD8 problems
- Excess RTV sealant clogging the oil pickup (early FA24)
- Oil pressure drops in long, fast right-hand turns on track
- Rear turn signals may not work (2022 BRZ and GR86 recall)
- Check engine light for cam timing, evap leak-check or ECM communication codes (ECM update)
- Wrong load-capacity label on some dealer-accessorized GR86s
- BRZ aluminum front knuckles rule out most Gen1 brake kits
More for this car
- All Toyota GR86 / Subaru BRZ (ZN8/ZD8, 2022+) fitment answers · ZN8/ZD8 common problems
- Newsletter archive: past issues with every new and corrected entry
Sources
- Subaru service bulletin 16-138-22: DTC P0613, TCM processor (2022MY BRZ automatic) — Subaru of America (bulletin hosted by NHTSA) (mfr spec; read 2026-10-26; full page read)
Summaries are in our own words. Not repair instructions; consult the factory service manual.
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