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Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14422
Experience:  Toyota Master Diagnostic
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Dtc code c120a will not erase, vsc light stays on

Customer Question

dtc code c120a will not erase, vsc light stays on
Submitted: 2 years ago.
Category: Toyota
Expert:  Skyvisions replied 2 years ago.

Has any brake work been done and do you know what this code means?

Customer: replied 2 years ago.
no brake work, we did an alignment on a Hunter machine, then went through the ESC reset proedure. Code C120A is a manufacurer defined code saying ECU initialization incomplete
Expert:  Skyvisions replied 2 years ago.

This code set whenever the master cylinder solenoid is not informed that the vehicle is equipped with downhill assist control or crawl control and downhill assist control or crawl control operates. Somewhere or somehow this information got lost when you did the reinitialization after the alignment. The only way to reinitialize or recalibrate this is using a Toyota approved scan tool that access the vehicle skid control system to recalibrate or inform system that it has downhill assist control. If your scan tool will not do that feature you will need to have this sent to a Toyota or Lexus dealer to have that programmed.

Customer: replied 2 years ago.
i was afraid you'd say that.
Expert:  Skyvisions replied 2 years ago.

Unfortunately that is the downside of technology. Please do not forget to rate the information that I provided you at three or higher so that I may be compensated.

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