Code
P1396
HUMMER
P — Powertrain
Wheel Speed Sensor 2 - G - Sensor Circuit Performance
AI status
Completed
Completed
100%
Causes
- Damaged or failed wheel speed sensor (Hall effect or reluctor/VR)
- Damaged, chafed or shorted wiring harness or connector
- Corroded or loose connector pins at sensor or ABS module
- Missing or damaged tone/reluctor ring (missing teeth or heavy corrosion)
- Excessive air gap between sensor and tone ring
- Faulty ABS/traction control module or internal electronics
Symptoms
- ABS and/or traction control warning light illuminated
- Cruise control or stability control disabled
- Inconsistent ABS activation or unexpected ABS/traction events
- Speedometer or odometer anomalies (in some vehicles)
- Stored fault code P1396 (may be intermittent)
What to check
- Retrieve freeze frame and live data with a scan tool; compare all wheel speed sensor readings at low speed
- Visual inspection of sensor, connector and wiring for damage, corrosion or rubbing
- Backprobe sensor connector to check reference voltage (if active sensor), ground and output signal using DVOM or oscilloscope
- Spin the wheel and observe AC voltage (passive/VR sensor) or digital pulse (active/Hall sensor) while monitoring with scope
- Check sensor resistance and continuity to specification (consult service manual)
- Inspect tone/reluctor ring for missing or damaged teeth and ensure correct mounting and air gap
Signal parameters
- Passive (VR) sensors: generate AC voltage that increases with wheel speed; expect rising AC amplitude with speed (millivolts to volts depending on speed and sensor)
- Active (Hall/active) sensors: require reference voltage (typically 5 V or switched supply) and produce a square wave/pulse whose frequency scales with wheel speed (0–several kHz depending on speed)
- Resistance: varies by sensor type — consult vehicle/service manual for exact ohms; typical passive VR sensors often measure in the hundreds to low thousands of ohms
- Expected waveform: clean sinusoidal (VR) or clean square pulse (Hall) without dropouts, excessive noise or DC offset
- If signal is sporadic, shows missing pulses or drops to 0 V, circuit or sensor fault likely
Diagnostic algorithm
- Use a scan tool to confirm P1396 is present and note any additional ABS/vehicle speed codes. Clear codes and retest to confirm persistent condition.
- Visually inspect the suspect wheel sensor, connector and wiring harness for damage, corrosion, chafing or loose mounting. Repair visible damage.
- Backprobe the sensor connector. For active sensors check reference supply (≈5 V or vehicle specific) and ground. For passive sensors, check continuity to ABS module and sensor resistance if service data available.
- With wheel off the ground, spin wheel or rotate hub and monitor signal with an oscilloscope (preferred) or multimeter. Look for a consistent waveform or rising AC voltage with speed. Wiggle wiring to detect intermittent faults.
- Inspect tone/reluctor ring for missing/metal debris, rust or deformation and verify correct sensor air gap. Correct or replace as needed.
- If wiring shows open/short/grounding issues, repair harness and connectors; retest signal after repair.
- If sensor fails output/resistance checks or oscilloscope waveform is abnormal, replace the wheel speed sensor and retest.
- If sensor and wiring test good but fault remains, check continuity between sensor connector and ABS module pins and verify module grounds and power. Repair or replace module only after wiring and sensors are confirmed good.
- After repairs, clear codes and perform road test with live data to verify proper sensor readings and that P1396 does not return.
Likely causes
- Wiring/connector damage or corrosion at the sensor (most common)
- Defective wheel speed sensor (failed electronics or magnet tip)
- Damaged or distorted tone/reluctor ring
- Poor sensor-to-ring air gap or misalignment
- Intermittent connector or grounding issue
Fault status
Status
ABS/traction control module detected an out-of-spec signal from Wheel Speed Sensor 2 - G circuit. ABS and/or traction control warning may be illuminated; vehicle safety systems may be disabled or operate incorrectly until the fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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138
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