Bendix EC-60 UDS 250 / SPN 1809 FMI 2 — LAS Plausibility Error (Inside Model Based Limits)

Code Details

Plain-English Meaning

The EC-60 detected a plausibility error (inside model limits) from the lateral acceleration sensor (LAS). The LAS measures side-to-side acceleration; the EC-60 uses this data for roll-stability control. A LAS fault disables the roll-stability portion of ESP.

The Bendix EC-60 table maps UDS code 250, blink code 23-05, J1587 099-02, and J1939 SPN 1809 FMI 2 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

• ESP/stability lamp on; roll-stability function disabled
• ABS and ATC continue to operate normally
• No change in normal driving — roll-stability only activates in extreme cornering or lane-change maneuvers
• Code may correlate with sensor replacement, mounting bracket damage, or chassis work
• Static LAS faults may show on a flat surface; dynamic faults show during maneuvering

Possible Causes

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

• LAS reading inconsistent with other sensor data (YRS, SAS, vehicle speed) under similar conditions
• Corroded or loose LAS connector
• LAS physically damaged by impact or water intrusion
• LAS mounting bracket bent or cracked, shifting sensor orientation
• Wiring harness damage between LAS and EC-60

First Checks

• Inspect the LAS and its mounting bracket for damage, looseness, or contact with nearby components.
• Check the LAS connector — corrosion or a partially unseated connector is a common first find.
• Measure LAS supply voltage and ground at the connector.
• Use Bendix ACOM live data to observe LAS output at rest (should read near 0 g on a level surface) and during a slow maneuver.
• If output is fixed or out of range with the vehicle still, the sensor or its supply is suspect.

Can I Keep Driving?

A stability sensor fault (yaw rate, steering angle, or lateral acceleration) disables ESP stability intervention while leaving ABS and ATC intact. The vehicle handles as it would without electronic stability control. Drive with that in mind — cornering, evasive maneuvers, and braking on slippery surfaces carry a higher risk. Stability sensor faults should be addressed before returning the vehicle to regular line-haul or severe-weather service.

Related Lookup Pages

• FMI 2 explanation
• Bendix manufacturer hub
• ABS / ATC / ESP fault codes
• ABS Light symptom page
• Brake Warning Light symptom page
• Search this code