C0229 on 2000-2006 GMC Yukon XL — Dropout of Front Wheel Speed Signals
1 vehicles · 1 makes · $180-$900 repair
How to diagnose and fix C0229: 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.
GMC Yukon XL · 2000–2006
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.
Common Symptoms
- ABS activates at 3-10 mph on dry roads
- brake pedal kicks back at low speed
- longer stopping distance near a stop sign
- ABS warning light
- grinding or humming from front wheel bearing
How to Fix
Scan ABS wheel speed data during a low-speed stop and compare left and right front sensor readings. If one sensor drops out, inspect for rust buildup under the sensor or excessive hub play; cleaning the sensor mounting surface may help temporarily, but many vehicles need a complete front hub/bearing assembly with integrated sensor. Clear ABS codes and road-test after repair.
Sources for this issue (1)
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C0229 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 C0229 mean?
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.
What are the most common causes of C0229?
The most common causes of C0229 are: 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. The specific cause varies by vehicle.
How much does it cost to fix C0229?
Repair costs for C0229 range from $180 to $900, depending on the vehicle and root cause.
Which vehicles are affected by C0229?
Au7o has documented C0229 across 1 vehicle models from 1 manufacturers: GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.