Toyota C2303: Short in Power Source Relay Circuit

Is your scanner showing Toyota C2303?
No worries. We'll show you what it means and how to deal with it.

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OBDCodex, Editor

Toyota C2303: Short in Power Source Relay Circuit

DIY Difficulty Level
Repair Cost
Can I Still Drive?

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

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