C0229 on GMC
Dropout of Front Wheel Speed Signals
C0229 on GMC vehicles indicates dropout of front wheel speed signals. Au7o has documented this code across 1 GMC model — most commonly on Yukon XL. This code sets when the ABS module detects a simultaneous loss (dropout) of both front wheel speed signals. Losing both front signals at once usually points to a shared fault — such as a common ground, power feed, connector, or harness problem affecting both sensors — rather than a single failed sensor. ABS, traction control, and stability control are typically disabled and the warning lights illuminate. Like other front-sensor codes, very rough driving can occasionally trigger it on an otherwise healthy system. Typical repair costs on GMC range from $180 to $900, depending on the specific model and root cause.
Common Causes of C0229
- •Damaged or corroded shared wiring/connector
- •Common ground or power-feed fault to both sensors
- •Both front wheel speed sensors dirty or damaged
- •Loose/corroded ABS module connector
- •Harness damage affecting both front circuits
- •Tone ring damage on both front wheels
- •Rough-road false trigger
C0229 on GMC by Model
GMC Yukon XL(1 issue)
- Front Hub Bearing and ABS Wheel Speed Sensor Corrosion Causing Unwanted ABS Activation2000-2006
GMT800 SUVs commonly develop corrosion under the front wheel speed sensors or wear in the hub bearing assembly, which alters the low-speed wheel speed signal. The result is unexpected ABS activation at parking-lot speeds, longer stopping distances, and a pulsating brake pedal even on dry pavement. GM documented this condition in service bulletins, and owners frequently report replacing hub assemblies to cure it.
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View C0229 across all makes →Frequently Asked Questions
What does C0229 mean on GMC?▼
C0229 stands for "Dropout of Front Wheel Speed Signals." This code sets when the ABS module detects a simultaneous loss (dropout) of both front wheel speed signals. Losing both front signals at once usually points to a shared fault — such as a common ground, power feed, connector, or harness problem affecting both sensors — rather than a single failed sensor. ABS, traction control, and stability control are typically disabled and the warning lights illuminate. Like other front-sensor codes, very rough driving can occasionally trigger it on an otherwise healthy system. On GMC specifically, this code is documented across 1 model.
What causes C0229 on GMC vehicles?▼
Common causes on GMC: Damaged or corroded shared wiring/connector, Common ground or power-feed fault to both sensors, Both front wheel speed sensors dirty or damaged, Loose/corroded ABS module connector, Harness damage affecting both front circuits. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0229 on a GMC?▼
Repair costs on GMC range from $180 to $900, depending on the specific model and root cause.
Which GMC models have C0229 documented?▼
Au7o has documented C0229 on 1 GMC model: Yukon XL.