Deutz Fault Code

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SPN 168 FMI 1

Starter clicks; Gauges dimming; ECM resets; Random fault codes.

System

Not specified

Symptom

Starter clicks; Gauges dimming; ECM resets; Random fault codes.

Diagnosis & fix steps

Battery Voltage Low LOGIC: Supply voltage to the ECM dropped below 9V. ACTION: Load test batteries. Check the main power relay. Clean the frame ground. FIX: Charge/replace batteries; clean battery terminals.

Red Seal field insights

Deutz ECMs are very sensitive to "dirty" power. A bad alternator diode can cause "phantom" SPN 168 codes even if the battery is charged.

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