C1970

Code

Generic C — Chassis

Yaw Rate Sensor Circuit - Range/Performance

Brand: Generic

Type: C — Chassis

Views: UK: 9 EN: 19 RU: 9

AI status

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Page language: EN

Causes

Faulty yaw rate (gyroscope) sensor
Open, shorted or corroded wiring/connectors to the sensor
Poor or missing sensor ground or reference voltage
Intermittent connection due to water intrusion or damaged clip
Faulty ABS/ESC control module or internal electronics
Sensor not calibrated or calibration lost after service

Symptoms

ABS, ESC, or Traction Control warning lamp illuminated
Stability control/traction functions unavailable or disabled
Possible undesired activation of ABS/ESC
Vehicle handling or stability feel abnormal during turns
Diagnostic trouble code stored and may persist after restart

What to check

Read freeze frame and full DTC list with a capable scan tool (ABS/ESC module)
Visually inspect sensor and harness for damage, corrosion, or loose connectors
Check for related codes (wheel speed, steering angle, CAN bus faults)
Check sensor supply voltage and ground at the connector with ignition ON
Measure sensor signal waveform with oscilloscope while rotating vehicle (or wheel) and compare to expected center bias and swing
Inspect for water ingress or damaged mounting that could affect sensor orientation

Signal parameters

Supply/reference: typically 5 V (varies by manufacturer) and a ground
Signal type: analog biased output or digital (SPI/CAN/I2C) on some modern sensors
Analog idle/zero output: approximately mid-supply (often ~2.5 V) at rest
Analog dynamic output: small AC change around center bias (typical ±0.5–1.0 V depending on sensor sensitivity)
Impedance/voltage tolerance: check OEM spec; significant deviation from mid-bias or flatline indicates failure
Some sensors include built-in diagnostics and report status over CAN instead of simple analog voltage

Diagnostic algorithm

Retrieve all codes and freeze frame data from ABS/ESC and engine modules. Note related codes (wheel speed, steering angle, CAN).
Visually inspect the yaw rate sensor, bracket, and harness. Repair any damaged wiring or corroded connectors.
With ignition ON (engine off), verify sensor supply/reference voltage and ground at the sensor connector with a DMM. Compare to spec.
Back-probe the sensor signal lead. With vehicle stationary, confirm the signal rests near mid-supply (~2.5 V).
With an oscilloscope or scan tool live data, rotate the vehicle (or perform a controlled turn/rotate a wheel on a lift) and observe signal change. Look for smooth, proportional output and no dropouts.
Check wheel speed sensors and steering angle sensor for consistency; conflicting inputs can cause range/performance flags.
Inspect CAN bus or communication lines if the sensor is digital. Verify message presence and integrity with a scope or module scanner.
If wiring, power and ground are good but signal is out of range or noisy, replace the yaw rate sensor and clear codes.
After replacement, perform required sensor alignment/calibration or ABS/ESC module relearn procedures per manufacturer instructions.
Road test to confirm fault does not return and stability control operates normally.

Likely causes

Damaged or corroded connector at yaw rate sensor
Failed yaw rate sensor (most common)
Broken or pinched wiring between sensor and ABS/ESC module
Sensor supply (5V) or ground open/unstable
Missing/calibration fault after battery disconnect or sensor replacement

Fault status

⚠️ Status

Yaw Rate Sensor Circuit — Range/Performance detected. Stability/ESC functions may be disabled. Inspect yaw sensor, wiring, power/ground, and perform sensor calibration if applicable.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours