P0613
TCM Processor
Computer output circuit
Generic OBD-II
High
What it means
P0613 is an internal self-check failure in the transmission control module's processor. The TCM manages shift timing and pressure, so a processor fault often drops the transmission into limp mode — a single fixed gear with harsh or delayed shifts. The engine still runs, but before assuming the module is bad, its power feeds, grounds, and connectors should be verified, as a weak supply frequently triggers this code.
High
Can I keep driving? Risky — the transmission may drop into limp mode (fixed gear). Drive gently and get it diagnosed promptly.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, erratic, or delayed shifting
- Transmission stuck in one gear (limp mode)
- Reduced power or acceleration
Common causes
Most likely first
- Poor power supply or ground to the transmission control moduleLikely
- Corroded or loose TCM connectors/wiringCommon
- Internal TCM processor faultCommon
- Damaged ECM affecting shared processing/communicationLess often
How to diagnose & fix
Work through it in order
- Scan for companion transmission codes and check TCM communication on the data bus.
- Verify the TCM's battery voltage feeds and grounds are clean and tight — a weak supply commonly triggers processor faults.
- Inspect the TCM connectors for corrosion, bent pins, or water intrusion.
- If power, grounds, and wiring are good, reflash or replace the TCM per manufacturer procedure. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0613?+
Only cautiously. The transmission may enter limp mode, limiting speed and locking a gear. Driving hard in this state can add wear — get it diagnosed soon.
Can I just clear P0613?+
It may clear temporarily, but an internal processor or power-supply fault will bring it back. Fix the grounds/power or module first.
Related codes
Often seen with P0613
Read & clear P0613 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX