C0327 on GMC
Excessive Lateral Acceleration Sensor Rate
C0327 on GMC vehicles indicates excessive lateral acceleration sensor rate. Au7o has documented this code across 3 GMC models — most commonly on Jimmy, Sierra 3500HD, Yukon XL. 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. Typical repair costs on GMC range from $150 to $800, depending on the specific model and root cause.
Common Causes of C0327
- •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
C0327 on GMC by Model
GMC Jimmy(1 issue)
- Transfer Case Encoder Motor Failure (AutoTrac)1998-2001
The NP136 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.
GMC Sierra 3500HD(1 issue)
- Front Differential Actuator Failure Causing 4WD Engagement Problems2007-2022
The front axle disconnect actuator (also called the front axle engagement actuator or IWE—Integrated Wheel End) on four-wheel-drive Sierra 3500HD models is known to fail, preventing proper engagement or disengagement of 4WD. Owners report grinding noises from the front axle area in 2WD mode due to hubs failing to fully disengage, or the inability to engage 4WD when needed. Vacuum leaks in the actuator system are the most common root cause.
GMC Yukon XL(1 issue)
- Transfer Case Fluid Leak from Output Shaft Seal2015-2024
Four-wheel-drive Yukon XL models with the NP263 (NQH) and NP246 transfer cases develop fluid leaks from the front and rear output shaft seals. The leak typically starts as a slow weep and progresses to a steady drip, leaving ATF spots on the driveway. If left unaddressed, the transfer case runs low on fluid, causing internal damage to the chain, sprockets, and bearings. The rear output seal is the most common failure point.
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View C0327 across all makes →Frequently Asked Questions
What does C0327 mean on GMC?▼
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. On GMC specifically, this code is documented across 3 models.
What causes C0327 on GMC vehicles?▼
Common causes on GMC: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0327 on a GMC?▼
Repair costs on GMC range from $150 to $800, depending on the specific model and root cause.
Which GMC models have C0327 documented?▼
Au7o has documented C0327 on 3 GMC models: Jimmy, Sierra 3500HD, Yukon XL.