Fault Code 37 Troubleshooting — Eaton Fuller Advantage Power

This Fault Code 37 troubleshooting page from the Eaton Fuller Advantage Heavy Duty service set guides a technician through the fault isolation procedure for high resistance in the vehicle power supply to the TECU. Published as TRTS0980, it combines an Electrical Pretest with continuity checks on the power and ground wiring.

Official document details

Document table of contents

• Step A — Check for Active or Inactive fault codes
• Step B — Perform the Electrical Pretest and Load Test
• Step C — Inspect batteries, in-line fuse and supplies
• Step D — Verify continuity of power and ground wiring
• Step V — Verify repair

Applicable truck models

The procedure applies to Eaton Fuller Advantage Heavy Duty transmissions powered through the 38-Way Vehicle Harness, and it directs the technician to consult OEM diagnostics for the vehicle power supply. Product and wiring references are published on the Eaton Vehicle Group official website.

Fault Code 37 troubleshooting workflow

After the Load Test, the technician inspects the starter, batteries and 30-amp in-line fuse holder for corrosion or loose terminals, then measures resistance from 38-Way Connector Pin 38 to Battery Positive and Pin 36 to Battery Negative (0.0–0.3 ohms each). Readings decide whether the fault is intermittent wiring or a wiring repair between battery and TECU.

Who needs this Fault Code 37 troubleshooting manual

Technicians and fleet electricians use this sheet to confirm a high-resistance power connection with measured values before replacing wiring, then clear and road-test the code with ServiceRanger to verify the repair.

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