Bendix EC-60 UDS 59 / SPN 806 FMI 4 — TCV DA Solenoid Shorted to Ground

Code Details

Plain-English Meaning

The EC-60 detected a short to ground in the drive axle TCV circuit. The TCV applies brake pressure to a spinning drive wheel to reduce wheelspin during traction control events. A TCV fault disables ATC for the affected axle; ABS continues to operate normally.

The Bendix EC-60 table maps UDS code 59, blink code 18-01, J1587 018-04, and J1939 SPN 806 FMI 4 to this ABS/ATC/ESP diagnostic entry. The Bendix source indicates an ABS and/or ATC/ESP warning lamp can be on for this entry. The EC-60 continuously monitors wheel speed sensor circuits, pressure modulation valve output drivers, supply voltage quality, J1939 network data from the engine and transmission controllers, and internal self-diagnostic routines. When any monitored value falls outside its acceptable range — or a circuit does not respond as the module expects — the EC-60 logs a diagnostic trouble code and may disable the affected ABS, ATC, or ESP function. Bendix ACOM Pro or a compatible diagnostic interface is the required tool for reading live sensor data, running actuator tests, performing calibrations, clearing latched codes, and adjusting EC-60 configuration parameters. Generic J1939 scan tools can read the SPN/FMI but cannot access EC-60-specific live data screens or configuration settings.

Common Symptoms

• ATC/ESP lamp on
• ATC disabled for the affected axle — wheel spin may go uncorrected on slippery surfaces
• ABS continues to function normally
• Code active; no unusual feel during normal driving
• Scan tool shows Bendix EC-60 UDS 59 / SPN 806 FMI 4

Possible Causes

Possible causes may include the items below. The list is not a parts diagnosis.

• TCV wiring grounded through harness damage or a shorted solenoid coil
• Corroded or loose connector at the TCV solenoid
• TCV solenoid coil internally shorted
• Harness damage at flex points near axle housing or air spring brackets
• Moisture in TCV connector

First Checks

• Unplug the TCV connector and measure solenoid resistance — consult Bendix service data for the specification.
• Measure from the TCV wire to ground and to voltage to locate the short.
• Inspect the drive axle TCV connector for corrosion, bent pins, loose terminal grip, and secure locking.
• Trace the drive axle TCV harness along the axle and frame rail for chafe points, especially near suspension movement and clamp points.
• After repair, clear Bendix EC-60 UDS 59 / SPN 806 FMI 4 with Bendix ACOM and verify ATC function on a controlled low-traction or service test procedure.

Can I Keep Driving?

ABS, ATC, and ESP brake-system codes should be handled conservatively. Normal base braking continues when ABS or stability functions are disabled, but the safety benefit of anti-lock and stability intervention is not available. If a brake warning lamp, red stop indicator, loss of braking performance, steering concern, or uncharacteristic vehicle behavior appears alongside this code, stop safely and follow OEM or fleet guidance before continuing.

Related Lookup Pages

• FMI 4 explanation
• Bendix manufacturer hub
• ABS / ATC / ESP fault codes
• ABS Light symptom page
• Brake Warning Light symptom page
• Search this code