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Home / DTC / U1202 — Straight G sensor parity error

U1202 — Straight G sensor parity error

Detailed page for trouble code U1202.

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U1202

MITSUBISHI U — Network/User

Straight G sensor parity error

Brand: MITSUBISHI
Type: U — Network/User
Views: UK: 19 EN: 32 RU: 33
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty straight (longitudinal) G accelerometer sensor
  • Damaged wiring or poor connector connection between sensor and control module
  • Intermittent or low power supply / poor ground to the sensor
  • CAN / serial bus communication errors or high network noise
  • Control module memory or parity check failure (software/firmware error)
  • Corroded pins, bent terminals, or water intrusion at connector

Symptoms

  • ABS, ESC/traction control or stability warning lamp illuminated
  • Reduced or disabled traction / stability assist
  • Diagnostic trouble code U1202 stored, possibly with related network codes
  • Erratic or implausible acceleration (G) values in live data
  • Possible limp-home mode or limited functionality of related systems

What to check

  • Read freeze frame and all stored U/P codes; note any accompanying network codes
  • Check live data for straight G sensor value and update rate with a scan tool
  • Visually inspect sensor connector for corrosion, bent pins, or water ingress
  • Verify sensor supply voltage and ground at the connector (reference ~Vcc and ground)
  • Perform wiggle test on wiring while monitoring live data and watch for changes or faults
  • Check CAN or sensor communication lines for shorts, opens, or excessive resistance

Signal parameters

  • Sensor output typically centered near mid-supply at 0 g (≈ Vcc/2) — verify against OEM spec
  • Operational measurement range commonly ±2 g to ±8 g depending on sensor
  • Message/update frequency: typically 10–100 Hz (manufacturer-specific)
  • Expected steady value at rest near mid-value; spikes or jumps indicate errors
  • Parity or checksum bit must match on each telemetry frame; mismatch raises U1202

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data. Note time stamps and any correlated U-codes. Clear codes and test-drive to see if U1202 returns.
  2. Inspect the straight G sensor connector and wiring harness for damage, corrosion, or water intrusion. Repair any physical damage.
  3. With key on engine off, backprobe sensor connector: verify supply voltage (Vcc), ground integrity, and reference voltage per OEM spec. Repair poor power/ground connections.
  4. Use a scan tool to monitor the straight G sensor live data. At rest the reading should be near mid-scale and update at the expected rate. Wiggle harness and connector while watching for data dropouts or parity faults.
  5. Check CAN/communication bus health: measure bus voltages, look for error frames, and inspect termination resistors if applicable. Address any bus noise or multiple-module faults.
  6. If wiring/power/communication check out, consider replacing the straight G sensor with a known-good unit. Re-test and verify code deletion and sensor data correctness.
  7. If code persists after sensor replacement, suspect control module internal memory or firmware. Check for available software updates, reflash or reprogram the module per OEM procedures, or replace module if instructed.
  8. After repairs, perform required calibration/zero-point initialization for the G sensor and complete a road test verifying stable sensor readings and no return of U1202.

Likely causes

  • Damaged connector or wiring to the straight G sensor (most common)
  • Sensor internal failure producing corrupted data/parity bits
  • Loose/poor ground or intermittent 5 V / supply rail to sensor
  • CAN bus noise or missing/incorrect termination affecting messages
  • Control module firmware glitch or corrupted internal memory

Fault status

⚠️ Status
Data parity or integrity error detected for the straight (longitudinal) G sensor. The control module rejected sensor telemetry due to a parity/checksum mismatch or corrupted data frame.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0121 U0100 U0073 U0155 U1201
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

U1202

Other U — Network/User

SCP (J1850) Invalid or Missing Data for Windows

Brand: Other
Type: U — Network/User
Views: UK: 27 EN: 81 RU: 32
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty straight (longitudinal) G accelerometer sensor
  • Damaged wiring or poor connector connection between sensor and control module
  • Intermittent or low power supply / poor ground to the sensor
  • CAN / serial bus communication errors or high network noise
  • Control module memory or parity check failure (software/firmware error)
  • Corroded pins, bent terminals, or water intrusion at connector

Symptoms

  • ABS, ESC/traction control or stability warning lamp illuminated
  • Reduced or disabled traction / stability assist
  • Diagnostic trouble code U1202 stored, possibly with related network codes
  • Erratic or implausible acceleration (G) values in live data
  • Possible limp-home mode or limited functionality of related systems

What to check

  • Read freeze frame and all stored U/P codes; note any accompanying network codes
  • Check live data for straight G sensor value and update rate with a scan tool
  • Visually inspect sensor connector for corrosion, bent pins, or water ingress
  • Verify sensor supply voltage and ground at the connector (reference ~Vcc and ground)
  • Perform wiggle test on wiring while monitoring live data and watch for changes or faults
  • Check CAN or sensor communication lines for shorts, opens, or excessive resistance

Signal parameters

  • Sensor output typically centered near mid-supply at 0 g (≈ Vcc/2) — verify against OEM spec
  • Operational measurement range commonly ±2 g to ±8 g depending on sensor
  • Message/update frequency: typically 10–100 Hz (manufacturer-specific)
  • Expected steady value at rest near mid-value; spikes or jumps indicate errors
  • Parity or checksum bit must match on each telemetry frame; mismatch raises U1202

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data. Note time stamps and any correlated U-codes. Clear codes and test-drive to see if U1202 returns.
  2. Inspect the straight G sensor connector and wiring harness for damage, corrosion, or water intrusion. Repair any physical damage.
  3. With key on engine off, backprobe sensor connector: verify supply voltage (Vcc), ground integrity, and reference voltage per OEM spec. Repair poor power/ground connections.
  4. Use a scan tool to monitor the straight G sensor live data. At rest the reading should be near mid-scale and update at the expected rate. Wiggle harness and connector while watching for data dropouts or parity faults.
  5. Check CAN/communication bus health: measure bus voltages, look for error frames, and inspect termination resistors if applicable. Address any bus noise or multiple-module faults.
  6. If wiring/power/communication check out, consider replacing the straight G sensor with a known-good unit. Re-test and verify code deletion and sensor data correctness.
  7. If code persists after sensor replacement, suspect control module internal memory or firmware. Check for available software updates, reflash or reprogram the module per OEM procedures, or replace module if instructed.
  8. After repairs, perform required calibration/zero-point initialization for the G sensor and complete a road test verifying stable sensor readings and no return of U1202.

Likely causes

  • Damaged connector or wiring to the straight G sensor (most common)
  • Sensor internal failure producing corrupted data/parity bits
  • Loose/poor ground or intermittent 5 V / supply rail to sensor
  • CAN bus noise or missing/incorrect termination affecting messages
  • Control module firmware glitch or corrupted internal memory

Fault status

⚠️ Status
Data parity or integrity error detected for the straight (longitudinal) G sensor. The control module rejected sensor telemetry due to a parity/checksum mismatch or corrupted data frame.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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U0121 U0100 U0073 U0155 U1201
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