Toyota C2303: Short in Power Source Relay Circuit

What Does The Toyota C2303 Code Mean?

When the integration relay is off, voltage of transmission control ECU terminal MUA, MVA and MWA are 6 V or more for 0.064 seconds or more.

What Are The Potential Causes Of The Toyota C2303 Code?

• Transmission control ECU assembly
• Integration relay
• Wire harness or connector

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> INNOVA 5210
>>> Aramox Transmission Control Module

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

• 2010 Toyota Prius Repair Manual for C2303 – Pages 104-107.
• Electronic Shift Lever System Repair Information for C2303 – Pages 36-38.