C0327: How to Diagnose & Fix — Excessive Lateral Acceleration Sensor Rate
7 vehicles · 4 makes · $100-$3,000 repair
How to diagnose and fix C0327: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Kia Borrego · 2009–2011
The Borrego 4WD models use a BorgWarner transfer case that develops chain noise (whining/grinding) and can fail to engage 4WD or 4WD Lock modes. The transfer case chain stretches over time, and the encoder motor that controls mode selection can fail from water intrusion at the electrical connector. The transfer case fluid also breaks down faster than the 60,000-mile factory interval suggests, especially with towing or off-road use.
Common Symptoms
- Whining noise from underneath vehicle that increases with speed
- 4WD or 4WD Lock mode won't engage
- Service 4WD warning message
- Grinding noise when shifting between 2WD and 4WD
- Vibration at highway speed from driveline
How to Fix
Change transfer case fluid every 30,000 miles with the correct ATF specification. If chain noise is present, a transfer case rebuild or replacement is needed. The encoder motor can be replaced separately if 4WD mode selection is failing. Inspect the encoder motor wiring connector for corrosion — clean and apply dielectric grease to prevent future water intrusion. A used transfer case from a Mohave (the Borrego's international market name) can be sourced from import recyclers.
Owner tips & cautions
- TipChange transfer case fluid every 30,000 miles, not the factory 60,000 — the Borrego transfer case runs hotter than most due to vehicle weight
- TipInspect the encoder motor wiring connector for corrosion before replacing the motor itself — clean contacts and dielectric grease often fix engagement issues for free
- WarningDo not drive with 4WD engaged on dry pavement — this overloads the transfer case chain and accelerates wear
Sources for this issue (3)
GMC Jimmy · 1998–2001
The NP236 AutoTrac transfer case encoder motor fails, preventing the system from engaging 4WD or switching between 2WD and 4WD modes. The "Service 4WD" message illuminates on the dash.
Common Symptoms
- Service 4WD light
- Cannot engage 4WD
- Grinding from transfer case
- 4WD indicator light flashing
How to Fix
Replace the encoder motor (e.g. Dorman 600-906, VIN-check fitment) mounted on the transfer case. Drain and refill the transfer case with Auto-Trak II fluid during the repair. Clear DTCs after replacement.
Sources for this issue (2)
Chevrolet Silverado 1500 · 2000–2013
Silverado 1500 trucks equipped with electronic shift transfer cases commonly develop failures in the transfer case encoder motor, mode position sensor, or related switch/module circuitry. Owners report the truck getting stuck in 2HI, 4HI, or 4LO, flashing selector lights, or displaying a Service 4WD message.
Common Symptoms
- Service 4WD message
- stuck in 2HI or 4HI
- will not shift into or out of 4LO
- intermittent four-wheel-drive operation
How to Fix
Diagnosis should include checking transfer case switch inputs, encoder motor operation, transfer case control module communication, power/ground integrity, and corrosion at connectors. Repair often involves replacing the encoder motor assembly, dash 4WD selector switch, or reprogramming/replacing the transfer case control module if faults persist. Fluid condition and transfer case internal binding should also be ruled out before parts replacement.
Sources for this issue (2)
Cadillac Escalade ESV · 2015–2020
Chevrolet Blazer · 1995–1999
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C0327 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0327 mean?
C0327 stands for "Excessive Lateral Acceleration Sensor Rate." This chassis code means the stability/traction control system has detected an excessive or abnormal rate of change from the lateral acceleration sensor, which measures sideways g-forces during cornering. This sensor helps the electronic stability control (ESC) and ABS systems know how the vehicle is actually moving so they can intervene if it starts to skid. When the sensor's signal changes too fast, sticks, or reads implausibly, the computer flags it and may disable stability/traction control, often lighting the ESC, ABS, or traction warning lamps. Causes are usually a faulty sensor, its wiring, or a mounting/calibration problem.
What are the most common causes of C0327?
The most common causes of C0327 are: Faulty lateral acceleration (yaw/g) sensor, Loose or improperly mounted sensor (vibration/movement), Damaged, corroded, or loose sensor wiring/connector, Sensor out of calibration after suspension/alignment work, Faulty steering angle or yaw rate sensor affecting the system, Poor ground or low system voltage, Faulty ABS/stability control module. The specific cause varies by vehicle.
How much does it cost to fix C0327?
Repair costs for C0327 range from $100 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by C0327?
Au7o has documented C0327 across 7 vehicle models from 4 manufacturers: Cadillac, Chevrolet, GMC, Kia.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.