P1398

Code

CHRYSLER P — Powertrain

Wheel Speed Sensor 2, G-Sensor Circuit High Voltage

Brand: CHRYSLER

Type: P — Powertrain

Views: UK: 36 EN: 51 RU: 43

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Page language: EN

Causes

Damaged or shorted wheel speed sensor (sensor 2)
Short to battery voltage in sensor harness or connector
Corroded/loose connector or pin causing intermittent/high voltage reading
Faulty tone ring (missing teeth, metal contamination) or excessive air gap
Faulty ABS/traction control module or internal sensor interface
Water intrusion or chafed wiring causing intermittent short/high readings

Symptoms

ABS warning lamp and/or traction control light illuminated
Intermittent or disabled ABS/traction control functions
Erratic speed readings on ABS/ESC datastream for one wheel
Cruise control or stability systems may be limited or disabled
Possible diagnostic trouble codes stored for other wheel speed sensors or module faults

What to check

Connect a scan tool, read all stored and pending codes, record freeze-frame and live data for wheel speed sensors
Visual inspection of sensor 2 wiring, connector, and tone ring for damage, corrosion, contamination, or missing teeth
Backprobe connector with key on/engine off to check reference, supply and ground presence (compare to wiring diagram)
Wiggle harness and connector while watching live data to reproduce the fault
Measure sensor output with an oscilloscope while rotating the wheel (or road test) to confirm waveform shape and amplitude
Check resistance/continuity of the sensor harness to the controller and for shorts to battery and ground

Signal parameters

Verify manufacturer wiring diagram to determine sensor type (passive AC or active Hall-effect) before testing
Passive (magnetic) sensor: AC waveform whose amplitude increases with wheel speed; expect a clean sine/peaked waveform proportional to speed
Active (Hall/active) sensor: digital/square waveform referenced to 5V or a regulated supply; switching between ~0V and the sensor supply rail
Typical test values vary by vehicle — always compare to factory spec: check supply/reference voltage (often 5V or vehicle-specific), expected DC resistance of the sensor (if specified), and AC amplitude at slow wheel speeds

Diagnostic algorithm

Retrieve codes and freeze frame with a scan tool; note ignition and vehicle speed at fault occurrence.
Visually inspect sensor 2, tone ring, mounting, and connector for physical damage, contamination, or bent/missing teeth.
With connector disconnected, inspect pins for corrosion, pushed pins, or water intrusion; repair or replace connector as required.
Consult factory wiring diagram to locate sensor supply, signal and ground pins; backprobe and measure supply/reference voltage with ignition on — confirm it matches specification and is not over-voltage.
Measure sensor resistance (if passive type) and compare to spec; if out of range, replace sensor.
Use an oscilloscope or scan tool to observe the sensor signal while spinning the hub/wheel. Look for excessive DC offset, unusually high amplitude spikes, no signal or noisy/erratic waveform.
Check continuity from sensor signal to ABS/ECU connector and for shorts to battery (+) and ground. Repair wiring faults (splice, replace harness, secure away from sharp edges).
If wiring and sensor verify good, check ABS module power/ground and any reference regulator. Swap with known-good module only after all other causes are ruled out and following manufacturer procedures.
After repair, clear codes and perform road test to ensure the fault does not return and live sensor data is normal.

Likely causes

Wiring chafed and contacting a 12V source near wheel hub
Connector pins corroded or pushed out (poor contact causing voltage spikes)
Sensor magnet damaged or contaminated producing abnormal signal
Connector or harness exposed to moisture leading to high resistance/erratic voltage
ABS module supply or reference voltage regulator fault

Fault status

⚠️ Status

Wheel speed sensor 2 / G-sensor circuit reporting higher than expected voltage to ABS/traction module; system flagged and diagnostic trouble code stored.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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