---
title: "Toyota C2318"
slug: c2318
collection: obd2-codes
code: C2318
url: https://fixmycar.pk/obd2-code-list/c2318/
---
The Auxiliary Battery voltage is applied to terminal +B when the power switch is on (IG). The Transmission Control ECU outputs this Diagnostic Trouble Code (DTC) when the input voltage drops

### Toyota C2318 Possible Causes

1.  Faulty Auxiliary Battery
2.  HEV Fuse
3.  IGCT Relay
4.  Auxiliary Battery harness is open or shorted
5.  Auxiliary Battery circuit poor electrical connection

### DTC C2318 Detecting Condition

1.  Power switch on (IG)
2.  Terminal +B voltage of the transmission control ECU is 9.3 V or less for 1 sec. or more.

![C2318 Wiring Diagram](/uploads/2021/08/C2318-Wiring-Diagram.png)