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Home / DTC / U1201 — Yaw rate sensor parity error

U1201 — Yaw rate sensor parity error

Detailed page for trouble code U1201.

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U1201

MITSUBISHI U — Network/User

Yaw rate sensor parity error

Brand: MITSUBISHI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty yaw rate (gyro) sensor
  • Intermittent or damaged wiring/connectors between sensor and ABS/ECU
  • Poor power supply or ground to the sensor
  • CAN bus or serial communication errors (noise, terminated incorrectly, high bit error rate)
  • Faulty ABS/ESC/vehicle dynamics control module or software bug
  • Corroded connector pins or water ingress at the sensor

Symptoms

  • Stability control, ABS, or traction control warning lights illuminated
  • Loss of yaw/ESC functions or limited vehicle stability intervention
  • Diagnostic trouble code U1201 stored (may be accompanied by related DTCs)
  • Possible unexpected or reduced response from stability/traction systems
  • Occasional fault lamp flicker or intermittent warning if communication is intermittent

What to check

  • Read all stored DTCs and freeze frame; note related communication codes (U0xxx, U01xx, U04xx)
  • Clear codes and see if U1201 returns after drive cycle or power cycle
  • Inspect yaw sensor connector for corrosion, bent pins, moisture, or loose locking tangs
  • Visually inspect wiring harness for chafing, pinches, broken insulation, or repair splices
  • Check sensor supply and ground with key ON (approx. 5 V reference supply for many sensors; verify manufacturer spec)
  • Check CAN/comm bus health: look for other U-codes indicating bus errors, use a scan tool to view bus traffic and error counters

Signal parameters

  • Yaw sensor primary output: typically 0–5 V analog (many sensors use ~2.5 V as zero-rate reference) — consult model-specific spec
  • Zero-rate (rest) output near mid-rail (~2.5 V) on many sensors; positive/negative rotation shifts voltage above/below this point
  • Supply voltage typically a regulated 5 V reference (verify factory spec for vehicle)
  • Communication update rate: yaw data usually updated on CAN at 10–100 Hz depending on vehicle
  • Parity/data integrity: fault indicates packet-level error (parity/CRC/bit errors) — high error counts on CAN indicate bus problem

Diagnostic algorithm

  1. Retrieve full DTC list and freeze frame data. Note any additional communication or sensor codes.
  2. Clear codes, then perform ignition cycles and a short drive to see if U1201 returns to confirm repeatability.
  3. Visually inspect the yaw rate sensor area and connector. Repair or clean any corrosion or damage.
  4. Backprobe sensor connector: verify reference supply (5 V), ground continuity, and sensor signal at key ON and during engine off/ON conditions. Compare to manufacturer values.
  5. Use a scan tool to view live yaw rate values while gently rotating the vehicle (or on a lift with wheels off) and compare to steering angle/wheel speed values for plausibility.
  6. If the sensor output is noisy, missing, or shows parity/checksum failures on the diagnostic tool, perform a wiring continuity and resistance check between sensor and module connectors. Repair any short/open circuits.
  7. Inspect and diagnose the CAN/communication bus: check termination, voltages on CAN High/Low, and error counters. Repair any bus faults or splices that introduce noise.
  8. If wiring and bus are good but parity errors persist, swap with a known-good yaw rate sensor (if available) or replace the sensor and re-test.
  9. If fault remains after replacing sensor, consider reprogramming/updating the ABS/vehicle dynamics control module software and inspect that module for internal faults or intermittent grounds/power.
  10. After repair, clear codes and perform a full drive/functional test to confirm normal operation of stability control and that U1201 does not return.

Likely causes

  • Corroded/damaged connector or wiring to yaw rate sensor (most common)
  • Yaw rate sensor internal fault (failed parity/CRC generation)
  • CAN/communication interference or short to battery/ground
  • Faulty vehicle dynamics or ABS control module interpreting the message incorrectly

Fault status

⚠️ Status
Yaw rate sensor parity/data integrity error — communication or sensor data corrupted.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.5 hours

Similar codes

U0415 U0121 U1101 U0401 P0562
406

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