C1A5A

Code

Generic C — Chassis

Yaw Rate Sensor Signal Implausible

Brand: Generic

Type: C — Chassis

Views: UK: 10 EN: 12 RU: 12

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Yaw rate (rotation) sensor internal failure
Corroded/damaged connector or wiring harness (open, short to power/ground, intermittent)
Incorrect reference ground or supply voltage to the sensor
Sensor uncalibrated or calibration lost after service/repair
Faulty vehicle dynamics/ABS/ESC control module or software bug
Electrical noise or interference on sensor signal

Symptoms

ABS/ESC warning light or traction control lamp illuminated
Loss or degradation of stability control or rollover mitigation functions
Unexpected activation or lack of activation of stability control interventions
Diagnostic trouble code stored with possible limp/limited performance depending on vehicle
Vehicle may feel unstable during turns or evasive maneuvers (depending on if systems are inhibited)

What to check

Read and record freeze frame/related codes and data with a capable scan tool
Confirm ignition voltage and sensor power/ground at the yaw rate sensor connector
Visually inspect connector and wiring for corrosion, damage, pin push-out, or water intrusion
Check for TSBs or software/firmware updates for vehicle dynamics/ABS module and yaw sensor
Compare yaw rate sensor data with steering angle sensor and wheel speed sensors on scan tool (static and dynamic)
Perform wiggle test on wiring harness while watching live data for intermittent changes

Signal parameters

Sensor type: MEMS yaw rate gyroscope (analog or digital) or CAN-based module
Analog output typical: 0–5.0 V with ~2.5 V at 0 deg/s (nominal center voltage) — actual center and scale vary by manufacturer
Analog sensitivity example: ~0.01–0.1 V per deg/s (manufacturer specific)
Digital/CAN sensors: report yaw rate in deg/s via CAN bus; expected near 0 deg/s at rest with low noise
At rest expected output: near 0 deg/s ± small noise (check manufacturer tolerance)
Fault conditions: constant pegged voltage, large DC offset, implausible rapid jumps, or no data on CAN

Diagnostic algorithm

Retrieve DTC details, freeze frame, and live data with a scan tool; note related codes (steering angle, wheel speed, ABS).
Visually inspect yaw rate sensor and wiring harness; repair any obvious damage or corrosion.
With key on (engine off), verify sensor supply voltage and ground at the sensor connector per manufacturer values (typically battery voltage on Vbat and good ground).
Measure sensor output at rest: for analog sensors expect ~center voltage (~2.5 V) and low noise; for digital/CAN sensors confirm data stream present and reasonable (near 0 deg/s).
Wiggle harness and connectors while watching live data for intermittent changes; check for shorts to chassis/12V. Perform continuity/resistance checks if intermittent suspected.
Cross-check yaw rate reading against steering angle and wheel speed sensors during a slow controlled drive; look for implausible disagreements (e.g., yaw indicates rotation opposite to steering/wheel speed).
Clear codes and perform a road test to reproduce; if code returns, record conditions (speed, steering angle, temperature).
If sensor power/ground/CAN wiring is good and module communications are normal but readings are implausible, perform sensor calibration/initialization per service procedure (some vehicles require calibration after replacement or repairs).
If calibration fails or sensor output remains implausible, replace yaw rate sensor and retest. Retain old sensor for bench testing if required.
After repair, clear codes, perform required calibrations, and verify repair with road test and scan tool live data.

Likely causes

Intermittent connector contact at yaw rate sensor connector
Sensor supply voltage out of range (battery/ignition circuit issue)
Broken/shield compromised signal wire causing noise or short to 12V/GND
Yaw rate sensor physically damaged by impact or water ingression
Module received conflicting data from steering angle or wheel speed sensors
Recent repairs (steering column, suspension, battery) not followed by sensor/mode calibration

Fault status

⚠️ Status

Yaw Rate Sensor Signal Implausible — the vehicle dynamics control unit has detected yaw rate data that is out of expected range or inconsistent with other sensors, and has flagged it as unreliable.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours