Sidebar

SPN 111 FMI 19 – Coolant Level Sensor Received Data in Error Fault Code (Symptoms, Causes & Fix)

The SPN 111 FMI 19 fault code is a diagnostic trouble code that indicates the engine control module (ECM) has received erroneous data from the coolant level sensor. This diesel engine fault code suggests an issue with the signal integrity or the sensor's ability to communicate accurate coolant level information to the ECM.

What SPN 111 FMI 19 Means

When the SPN 111 FMI 19 fault code is active, it signifies that the ECM is detecting an error in the data received from the coolant level sensor. This could be due to a malfunctioning sensor, issues with the wiring or connectors, or an ECM calibration problem. The ECM relies on this sensor to monitor the coolant level and ensure the engine operates within safe temperature limits.

Common Causes of This Fault Code

  • Faulty coolant level sensor
  • Corroded or damaged sensor connector
  • Wiring harness issues such as shorts or opens
  • Incorrect sensor calibration or configuration
  • Voltage reference faults

Symptoms Drivers May Notice

When the SPN 111 FMI 19 fault code is present, drivers may notice warning lights on the dashboard, such as the check engine light or a specific coolant level warning. In some cases, the engine may enter a derate mode to prevent overheating, which can lead to reduced power and performance.

How Technicians Diagnose This Fault

Diagnosing the SPN 111 FMI 19 fault code involves a systematic approach. Technicians should start by checking the battery voltage and overall system voltage to ensure proper electrical supply. Next, verify the power supply and ground circuits to the sensor. Inspect the wiring harness for any signs of damage, corrosion, or loose connectors. Use a multimeter to check the 5-volt reference circuit if applicable. Verify the sensor's output voltage or resistance using a multimeter to ensure it is within specifications. Finally, check the ECM for any software updates or recalibration procedures related to the coolant level sensor.

Common Misdiagnosis

Technicians often misdiagnose this fault by assuming a low coolant level without verifying sensor operation. Another common mistake is replacing the sensor without checking the wiring harness or overlooking ECM software issues or calibration errors.

Can You Keep Driving?

While it may be possible to continue driving with the SPN 111 FMI 19 fault code active, it is not advisable. The fault may lead to engine derate or protection mode, reducing engine performance and potentially causing overheating if the coolant level is indeed low. It is best to address the issue promptly to avoid further complications.

Mechanic's Diagnostic Tip

When troubleshooting the SPN 111 FMI 19 fault code, always perform a thorough inspection of the wiring harness and connectors before replacing the sensor. Many issues stem from poor electrical connections rather than sensor failure. This approach can save time and prevent unnecessary part replacements.

Frequently Asked Questions

Q: What tools are needed to diagnose SPN 111 FMI 19?
A: A multimeter and diagnostic software are essential for testing voltage, continuity, and ECM data.

Q: Can a software update fix the SPN 111 FMI 19 fault code?
A: Yes, if the issue is related to ECM calibration or software, an update may resolve the fault.

Q: How can I prevent SPN 111 FMI 19 from occurring?
A: Regular maintenance, including checking connectors and wiring for corrosion or damage, can help prevent this fault code.

Other FMI Codes for SPN 111