Bendix EC-60 UDS 104 / SPN 792 FMI 14 — DA Right WSS Output Low @ Drive-Off

Code Details

Plain-English Meaning

At the moment the vehicle first starts moving, the EC-60 checks each WSS for a minimum output. The drive axle right WSS signal is below that threshold at very low speed — typically caused by an air gap that is borderline or a tone ring with shallow teeth.

The Bendix EC-60 table maps UDS code 104, blink code 05-02, J1587 004-14, and J1939 SPN 792 FMI 14 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

• ABS lamp on
• Code triggers at drive-off, not during highway travel
• Sensor passes a static resistance check
• Signal may appear normal above 5–10 mph but is weak below that
• More common in cold weather as components contract

Possible Causes

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

• Air gap near the upper end of the acceptable range — adequate at speed, marginal at near-zero
• Tone ring with worn or shallow teeth that generate less voltage at low speed
• Passive WSS with reduced coil output approaching end of service life
• Slight misalignment causing the sensor to track an off-center path across the ring
• Debris on the sensor face reducing effective signal level

First Checks

• Measure the physical air gap; if near the upper spec limit, reduce it within the allowable range.
• Inspect tone ring teeth for wear that reduces tooth height.
• If available, use Bendix ACOM live data to read WSS output at drive-off and compare to specification.
• Clean the sensor face and tone ring — metallic debris reduces output.
• Clear and perform a controlled low-speed drive to confirm resolution.

Can I Keep Driving?

ABS is disabled at the affected wheel channel while this fault is active. Normal hydraulic or air base braking continues unaffected — the vehicle can brake, but anti-lock protection is not available at that corner. Drive conservatively to a service location. Do not operate in conditions where ABS intervention would be likely, such as slippery surfaces or loaded highway braking. Clear only after root-cause repair.

Related Lookup Pages

• FMI 14 explanation
• Bendix manufacturer hub
• ABS / ATC / ESP fault codes
• ABS Light symptom page
• Brake Warning Light symptom page
• Search this code