Bendix EC-60 UDS 174 / SPN 1808 FMI 2 — Yaw Rate Sensor Vibration Detected

Code Details

Plain-English Meaning

The EC-60 detected that the yaw rate sensor is experiencing excessive vibration at its mounting location. The YRS uses MEMS (micro-electromechanical) sensing elements that respond to both the vehicle's rotational dynamics (the intended signal) and mechanical vibration (noise). When vibration amplitude at the sensor mounting point is high enough to exceed the sensor's isolation capability, the EC-60 flags the condition and suspends yaw-dependent ESP functions to avoid false stability interventions.

The Bendix EC-60 table maps UDS code 174, blink code 22-16, 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 lamp on, typically during vehicle operation rather than at key-on or at rest
• Fault may correlate with specific engine RPM ranges, road surface conditions, or load states
• ESP yaw-correction suspended while vibration is detected; may recover briefly under different conditions
• ABS and ATC continue to operate normally
• Code may be more common in winter (road surface changes) or when certain equipment is running

Possible Causes

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

• YRS mounting hardware loose — a single loose fastener allows the sensor to vibrate independently of the chassis and magnifies perceived motion
• YRS mounting location exposed to resonant vibration from the driveline, engine, or body structure at certain operating frequencies
• Aftermarket body equipment, hydraulic systems, or add-on accessories that increased vibration levels at the cab or chassis location where the YRS is mounted
• Worn driveline components (U-joints, carrier bearings, worn engine mounts) increasing base vibration transmitted to the sensor location
• YRS relocated or mounted improperly after body repair — Bendix specifies approved mounting zones on the chassis

First Checks

• Check all YRS mounting fasteners for correct torque — even one loose screw is enough to amplify vibration into the sensor significantly.
• Note whether the fault correlates with a specific RPM band, load condition, or road surface; RPM-correlated faults suggest resonance with a driveline or engine frequency.
• Inspect for recently installed equipment near the YRS location that could be introducing new vibration paths.
• Verify the YRS is in a Bendix-approved mounting location; body repair work sometimes results in the sensor being remounted outside the approved zones.
• After tightening mounting hardware or relocating the sensor to a less vibration-prone location, clear codes and test over a representative operating route.

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