DDEC III/IV Single ECM Troubleshooting – Section 13.1 Description of Flash Code 13

Section 13.1
Description of Flash Code 13

Flash Code 13 indicates that the Coolant Level Sensor (CLS) input to the ECM has dropped below 5% (normally < 0.25 volts) of the sensor supply voltage. See Figure "Coolant Level Sensor" . This diagnostic condition is typically:‪

• Sensor signal is shorted to the sensor return circuit or to ground
• Deteriorated coolant