C0035 on 2009-2016 Chevrolet Traverse: Left Front Wheel Speed Sensor Fault Guide

What's Unique About the 2009-2016 Chevrolet TRAVERSE

The first-generation Chevrolet Traverse, along with its GM Lambda platform siblings (GMC Acadia, Buick Enclave, and Saturn Outlook), is known for issues with the wheel speed sensor wiring. The wiring harness leading to the sensor is susceptible to stretching, internal wire breaks without visible insulation damage, and corrosion from suspension travel and steering. GM issued Technical Service Bulletin (TSB) #PIC5428G, later superseded by 17-NA-047, which acknowledges that codes C0035 through C0050 🎬 Watch: Explaining the C0035 circuit code and common failure points. are common and often related to the wheel bearing's magnetic encoder ring or the associated wiring, confirming this is a recognized issue on this platform. The design flaw often involves the harness being too short or poorly routed, causing repeated stress on the wires.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• ABS warning light is on
• "Service StabiliTrak" or "Traction Control Off" message on the dashboard
• StabiliTrak/Traction Control warning light is on
• Cruise control may be disabled
• Unwanted ABS activation or grinding/pulsing from the brakes at low speeds.
• A clicking or ratchet noise from the front of the vehicle at low speeds.

Most Likely Causes

1. Damaged Wheel Speed Sensor Wiring Harness or Connector 🔴 High Probability → Shop ABS Wheel Speed Sensor The wiring harness is a known weak point on this platform. Constant movement from steering and suspension can cause wires to fatigue and break internally, often with no visible damage to the outer insulation. The connector pins are also prone to corrosion. TSB #PIC5428G directly addresses this type of circuit fault.
   How to confirm: Visually inspect the entire length of the wiring from the wheel hub to its connection point. Look for chafing, stretching, or green corrosion in the connector. A common failure point is an internal break in the wire; gently pulling on the wires near the connector may reveal the insulation stretching, indicating a broken wire inside. Test for continuity and resistance between the sensor connector and the EBCM connector.
   Typical fix: Replace the wiring harness pigtail. This is often sold as a separate repair kit. The GM part number for a similar harness is 10340314, though it's best to verify for the specific vehicle.
   Est. part cost: $25 - $70
2. Failed Wheel Speed Sensor (Integrated into Hub Assembly) 🔴 High Probability → Shop ABS Wheel Speed Sensor The sensor is part of the sealed wheel hub/bearing assembly. When the wheel bearing wears out, it can create excessive movement (play) that damages the internal magnetic encoder ring or the sensor itself. Corrosion can also cause the sensor to fail. Water intrusion past a failed seal is a common cause of failure for the bearing and sensor.
   How to confirm: Using an ABS-capable scan tool, monitor the live data for the left front wheel speed while driving. If the reading is erratic, zero, or doesn't match the other wheels, the sensor/hub is likely bad. This should be done after confirming the wiring is intact. A failing bearing may also produce a humming or grinding noise that changes with vehicle speed.
   Typical fix: Replace the entire front wheel hub and bearing assembly. The sensor is not sold separately for this vehicle.
   Est. part cost: $90 - $220
3. Debris on or Damage to Magnetic Encoder Ring ⚪ Low Probability The hub assembly is sealed, but it is possible for metallic debris from brake wear or corrosion to accumulate on the magnetic ring that the sensor reads. In some cases, the magnetic strip can become damaged or sections can fall off, causing a total loss of signal.
   How to confirm: This requires removing the hub assembly to inspect the magnetic ring on the back for contamination or physical damage. TSB #PIC5428G specifically mentions cleaning debris from the encoder ring as a diagnostic step.
   Typical fix: Clean the magnetic encoder ring. If the seal is damaged allowing debris in, or if the ring itself is damaged, the hub assembly must be replaced.
   Est. part cost: $0 if cleaning works, otherwise the cost of a new hub assembly.

Rare But Worth Checking

• Failed Electronic Brake Control Module (EBCM): → Shop ABS Control Module This is the computer that controls the ABS and StabiliTrak systems. It's an expensive part and rarely the cause for a single wheel code. This should only be considered after all other possibilities (wiring, hub) have been definitively ruled out. An EBCM failure usually triggers multiple wheel speed sensor codes, not just one. Testing requires advanced diagnostics to check for proper voltage and ground at the module.

Diagnosis Steps

1. Connect an ABS-capable OBD-II scanner to confirm code C0035 is present and to check for any other codes.
2. Use the scanner's live data function to monitor the wheel speed of all four wheels while driving. Observe if the Left Front reading is erratic, absent, or doesn't match the others.
3. Raise and secure the vehicle. Visually inspect the wheel speed sensor wire from the back of the left front hub, up through the wheel well, to its connection point. Look for any signs of damage, chafing, or corrosion. On the Traverse, the harness connector is often located in the engine bay, requiring removal of the air filter box for access.
4. Gently tug on the wires near the connector. If the insulation stretches, the wire is broken internally.
5. Disconnect the harness connector and inspect the pins for corrosion or damage.
6. If a wiring issue is suspected, use a multimeter to test for resistance across the two pins of the sensor itself (should be 1000-2000 ohms for many GM sensors). Then, test for continuity and resistance between the sensor connector and the EBCM connector to rule out wire breaks.
7. If the wiring tests good and the live data was faulty, the wheel hub/sensor assembly is the most likely culprit.
8. Be aware that the axle nut requires a high torque setting (approx. 173 lb-ft) upon reassembly, and the hub bolts should be torqued to specification.

Parts You'll Likely Need

• Front Wheel Hub and Bearing Assembly (OEM #19434718 (Replaces 13580133, 13583478)) — This is the most common fix, as the wheel speed sensor is integrated into the assembly. A worn bearing or failed sensor requires replacing the entire unit.
  Trusted brands: ACDelco (Gold/Professional), Timken, MOOG, SKF, Dorman
  OEM price range: $180-$250
  Aftermarket price range: $90-$180
• ABS Wheel Speed Sensor Wiring Harness (OEM #10340314 (Verify application, may be for other GM models but widely cited)) — This harness is a frequent failure point due to stress and corrosion. It's a less expensive repair if the hub assembly is still good.
  Trusted brands: ACDelco, Dorman
  OEM price range: $40-$70
  Aftermarket price range: $25-$50

Related Codes That Often Appear With This One

• C0040 — This is the code for the Right Front Wheel Speed Sensor. If both appear, it could suggest a systemic issue like a shared wiring problem, a failing EBCM, or simply that both front hubs are worn out, which is common.
• C0045 — Code for the Left Rear Wheel Speed Sensor. Seeing multiple codes can point towards an EBCM issue rather than an individual sensor failure.
• C0050 — Code for the Right Rear Wheel Speed Sensor. The TSB PIC5428G groups all wheel speed sensor codes (C0035-C0050) together as having similar causes.

Technical Service Bulletins (TSBs) & Recalls

• PIC5428G: Addresses Service Stabilitrak lights and codes C0035-C0050, pointing towards issues with the wheel bearing and sensor circuits.
• 17-NA-047: Supersedes PIC5428G with updated information and procedures for diagnosing wheel speed sensor issues.

Platform-Specific Known Issues

• TSB #PIC5428G (superseded by 17-NA-047): GM issued this bulletin for multiple models including the Traverse, noting that intermittent ABS/StabiliTrak lights with codes C0035-C0050 can be caused by issues in the wheel speed sensor circuits, specifically pointing technicians to inspect for debris on the magnetic encoder ring and check wiring.
• Harness Routing and Access: On the Traverse and its platform mates, the driver's side harness connector is located high up in the engine bay, and technicians often need to remove the air filter housing to gain access for testing or replacement.

Mechanic-Grade Diagnostic Values

• Left Front Wheel Speed Sensor Signal (Active Sensor) — expected: A clean DC square wave when viewing the signal on an oscilloscope while spinning the wheel. The voltage amplitude should be consistent and match the other working sensors.. Failure: A missing, erratic, or noisy waveform that does not cleanly switch between high and low states, or has a significantly lower amplitude than other sensors.
• EBCM Connector Voltage Drop Test — expected: Minimal to no voltage drop (< 0.1V) between the sensor connector and the EBCM connector pins for both the signal and low reference wires.. Failure: A significant voltage drop indicates high resistance in the wiring, likely due to an internal break or corrosion.

Hidden / Shadow Codes Worth Checking

• C0035 0F: Indicates the wheel speed sensor signal is erratic. This often points to a failing magnetic encoder ring on the hub or debris interfering with the reading. (see via Requires a professional scan tool (like GM's GDS2/Tech2) capable of reading manufacturer-specific symptom bytes.)
• C0035 18: Indicates the signal from the sensor has low amplitude. This can be caused by an excessive air gap (due to rust jacking or improper installation), a failing sensor, or high resistance in the wiring. (see via Requires a professional scan tool (like GM's GDS2/Tech2) capable of reading manufacturer-specific symptom bytes.)
• C0035 5A: Indicates the sensor signal is not plausible. The EBCM compares the signal to other wheel speeds, and this code sets if the reading is illogical (e.g., reading 5 mph while others read 50 mph). This often points to a wiring issue or a damaged hub encoder ring. (see via Requires a professional scan tool (like GM's GDS2/Tech2) capable of reading manufacturer-specific symptom bytes.)

Scan Tool Commands That Help

• GDS2 / Tech2 or equivalent professional scanner: Automated Brake Bleed / ABS Bleed — This function is required after replacing the Brake Pressure Modulator Valve (BPMV), which is the hydraulic portion of the ABS unit. It cycles the internal valves and pump to purge trapped air from the hydraulic circuits that cannot be bled manually.
• GDS2 / Tech2 or equivalent professional scanner: Module Setup / VIN Programming — When replacing the Electronic Brake Control Module (EBCM), the new module must be programmed with the vehicle's VIN and specific configuration. A used module may work without programming if it came from an identically-optioned vehicle, but the VIN will be mismatched.

Wiring & Ground Locations

• EBCM Connector (X1) — The EBCM is located on the driver's side of the engine bay, mounted to the ABS hydraulic block, below the brake fluid reservoir.. This is the central connection point. The Left Front WSS signal wire is Light Blue (L-BU) at Pin 21. The Low Reference (ground) for the sensor is an Orange (OG) wire at Pin 20. Checking for signal at these pins is the definitive test.
• G103 — Located at the left rear of the engine compartment on the cowl, above the brake booster.. This is a major ground point for multiple modules in the instrument panel and body control system. While the EBCM has its own primary ground, a poor G103 can cause communication issues and erratic behavior in related systems, which can sometimes be misdiagnosed as an ABS fault.
• EBCM Main Ground — Part of the main negative battery cable harness, bolted to the front of the engine block on the driver's side.. This is the primary ground for the EBCM. A loose or corroded connection here can cause a host of ABS codes, including C0035, and is a critical check before condemning the expensive module.

Real Owner Repair Stories

• YouTube channel AllAmericanAutomotive (GM Truck (Silverado) with similar ABS system and codes) — Intermittent ABS light and unwanted brake pedal pulsing for months. Codes C0035, C0040, C0055 would appear.
  ❌ Tried (didn't work) Initial diagnosis pointed towards wheel speed sensors or hubs, which is the common assumption.
  ✅ What actually fixed it The root cause was corrosion ('green crusties') on the pins inside the main EBCM electrical connector. The fix was to cut out the corroded pins and splice in new ones, or replace the entire connector pigtail. The corrosion created intermittent high resistance and short circuits that the module interpreted as sensor faults.
• YouTube channel 'C0035 GM Wheel Speed Sensor Circuit' (2012 Chevy Sonic) — ABS code C0035, ABS module clicking and ratcheting noise, corrupt signal on oscilloscope at certain RPMs.
  ❌ Tried (didn't work) Initial thought was a bad wheel speed sensor.
  ✅ What actually fixed it After the vehicle returned with a lingering glitch, the technician removed the steering knuckle and found a broken spacer that was covering part of the magnetic encoder ring on the wheel bearing. Replacing the spacer provided a permanent fix.

OEM Part Supersession History

• 13580133 → 13583478, then 19434718 — Part has been updated or revised by the manufacturer over time.

Model Year Variations Within This Range

• 2012-2017: When replacing the EBCM (ABS Module), compatibility is critical. The module must be for a vehicle equipped with variable assist power steering, identified by RPO code NV7 on the vehicle's service parts identification sticker. Installing a module from a non-NV7 vehicle will result in further faults.
• 2013: The 2013 model year marked a significant mid-cycle refresh (facelift) for the Traverse. While many core components remained, always verify part numbers for the specific year, as wiring, connectors, and module software could differ between pre-facelift (2009-2012) and post-facelift (2013-2017) models.