Bendix EC-60 UDS 100 / SPN 1808 FMI 2 — YRS Invalid Signal

Code Details

Plain-English Meaning

The EC-60 detected that the yaw rate sensor's output is oriented in the wrong direction — when the vehicle turns right, the sensor reports a left-turn signal, or vice versa. This reversed polarity can arise from a sensor installed facing the wrong direction, a CAN signal polarity swap in the harness, or a replacement sensor with a different output convention. The EC-60 cannot use reversed YRS data for stability corrections because a yaw event to the right would trigger a correction intended for a left yaw.

The Bendix EC-60 table maps UDS code 100, blink code 22-03, J1587 103-02, and J1939 SPN 1808 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
• ESP may apply brake correction in the wrong direction during a maneuver — a reversed YRS is more dangerous than a missing one
• ABS and ATC continue to operate normally
• Code commonly appears after YRS replacement, harness repair, or chassis modification involving the sensor wiring
• Sensor may pass static resistance and supply checks because the signal is electrically valid, just reversed

Possible Causes

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

• Replacement YRS installed facing the opposite direction from the original — most sensors have an arrow or mounting mark indicating forward direction
• CAN High and CAN Low wires swapped at a connector during harness repair, inverting the differential signal and thus the polarity
• Replacement sensor from a different application with an opposite output polarity convention
• Incorrect part number installed — a sensor for a left-hand-drive application in a right-hand-drive vehicle, for example
• Harness splice with crossed polarity introduced during a body repair or harness replacement

First Checks

• Use Bendix ACOM live data to confirm the yaw rate signal direction — positive output during a right-hand turn is the standard convention for most Bendix installations; compare to what the live data actually shows during a slow, controlled turn.
• Verify the YRS mounting orientation matches the Bendix installation diagram; direction arrows or text markings on the sensor body indicate the required forward-facing direction.
• If mounting orientation is correct, check the CAN Hi and CAN Lo wires at each connector between the sensor and EC-60 for a polarity swap introduced during a harness repair.
• Confirm the installed part number matches the Bendix specification for this EC-60 application — an incorrect part number may have the opposite polarity.
• After correcting orientation or wiring, perform a fresh YRS calibration, clear codes, and verify the yaw rate sign is correct on ACOM live data before returning to service.

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