alecracing Posted July 8, 2023 Report Share Posted July 8, 2023 Good afternoon. I purchased a 2013 C-max Hybrid and RED brake warning light comes on, and sometimes the ABS/Traction control light comes on. I retrieved codes: C1133-64...left front brake pressure sensor - signal plausibility C1027-62...Master Cylinder to primary circuit pressure signal compare failure Has anyone encountered these codes? ALL-DATA doesn't even list these codes. I WAS able to reset the codes and then they would come back while driving. The C1133 code is now not able to be reset which indicates a hard fault. Looking at DATA on my Snap-On scanner only shows brake system pressure (1500psi). It does not show pressure for each circuit (right front, left front, etc) Google searches come up with nothing. I do not think there are separate sensors in the lines for each circuit. If anything, the ECU is probably looking at pressures in the hydraulic control unit. Any hep with this is much appreciated. Thank you in advanced. Quote Link to comment Share on other sites More sharing options...
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