C0035 on 2010-2017 Chevrolet Equinox: ABS Light Causes and Fixes

What's Unique About the 2010-2017 Chevrolet EQUINOX

For this generation of Chevrolet Equinox and its platform mates like the GMC Terrain, the wheel speed sensor is not a separate, individually replaceable part. Instead, it is integrated into the sealed wheel bearing and hub assembly. This means that if the sensor fails or, more commonly, the bearing wears out, the entire hub assembly must be replaced. Furthermore, as indicated in Technical Service Bulletin #PIC5428G, a worn wheel bearing can itself be the root cause of the fault by allowing excessive movement, which leads to an erratic signal from the otherwise functional sensor.

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
• Traction control system (TCS) warning light is on
• ABS system activates at low speeds or makes a grinding/ratcheting noise during slow turns (as mentioned in TSB PIC5428G).

Most Likely Causes

1. Worn or Failed Wheel Hub Bearing Assembly 🔴 High Probability The wheel speed sensor is integrated into the hub assembly. Wear and tear cause excessive play in the bearing, which creates an incorrect air gap or damages the magnetic encoder for the sensor, leading to an erratic signal. This is a well-documented failure pattern on this platform, often confirmed by owners in forums.
   How to confirm: With the vehicle raised, check for any play or roughness when wiggling the wheel from top-to-bottom and side-to-side. A dial indicator can be used to measure end play, which should not exceed 0.005 inches. A scan tool showing live data will reveal an erratic, lagging, or missing speed signal from the left front wheel while driving, while the other three wheels report matching speeds.
   Typical fix: Replace the entire left front wheel hub and bearing assembly. One owner on a Chevrolet forum noted that after replacing just the sensor cable didn't work, the issue was resolved by replacing the hub.
   Est. part cost: $100-$250
2. Damaged Wheel Speed Sensor Wiring or Connector 🟡 Medium Probability The wiring harness is exposed to the elements, vibration, and constant movement from steering and suspension travel, making it susceptible to chafing, breaking, or corrosion over time. The wires can become brittle and break internally near the connector, even with no visible external damage.
   How to confirm: Visually inspect the wiring harness from the back of the wheel hub up into the engine bay for any signs of damage, melting, or green corrosion at the connector pins. Use a multimeter to check for continuity and proper voltage at the sensor connector. With the sensor connected and the wheel spinning, you should see the sensor's current output switching between approximately 7mA and 14mA.
   Typical fix: Repair the damaged section of wire or replace the pigtail connector. In some cases, the entire sensor wire harness (which is separate from the hub on some models) needs to be replaced.
   Est. part cost: $15-$40
3. Debris on the Magnetic Encoder Ring ⚪ Low Probability Metallic brake dust and road grime can accumulate on the magnetic seal of the hub bearing where the sensor takes its reading, obstructing the signal. GM issued TSB PIC5428G (later superseded by 17-NA-047) specifically addressing this.
   How to confirm: This is difficult to confirm without removing the CV axle from the hub to visually inspect the inboard side of the bearing. The TSB suggests this as a primary diagnostic step for certain symptom bytes (0F, 18, 5A).
   Typical fix: Carefully cleaning the hub's magnetic encoder ring with a non-magnetic brush. The TSB explicitly warns against using magnetic tools for cleaning as they can damage the encoder. However, if the labor to access the ring is performed, many mechanics and owners opt to replace the hub assembly as a preventative measure.
   Est. part cost: $0

Rare But Worth Checking

• Faulty Electronic Brake Control Module (EBCM): This is rare. Before condemning the EBCM, all other possibilities (hub, wiring) must be exhaustively ruled out. An EBCM failure will often be accompanied by multiple wheel speed sensor codes (e.g., C0035, C0040, C0045 simultaneously) and a failure to communicate with a scan tool.

Diagnosis Steps

1. Connect a capable OBD-II scanner to confirm the C0035 code and check for any other related codes or symptom bytes (e.g., 0F, 18, 5A).
2. Use the scanner's live data function to monitor all four wheel speeds while driving. Observe if the left front wheel speed signal is erratic, drops to zero, or doesn't match the other wheels.
3. Raise and safely support the front of the vehicle.
4. Thoroughly inspect the wheel speed sensor wiring harness leading to the left front hub. Look for any chafed wires, loose connections, or corrosion at the connector.
5. Grasp the left front tire at the 12 and 6 o'clock positions and attempt to rock it. Do the same at the 3 and 9 o'clock positions. Any noticeable play or clunking indicates a worn wheel bearing.
6. If no play is obvious, spin the wheel by hand and listen for any grinding or rough noises from the bearing. An erratic signal can exist even without noise or play.
7. If wiring is intact and the bearing feels solid, use a multimeter to test for correct voltage and signal. At the sensor connector, there should be a B+ reference voltage (typically >11V). Probing the signal and ground wires while spinning the wheel should show a current that switches between a low value (approx. 4-8 mA) and a high value (approx. 11-16 mA).
8. If TSB PIC5428G/17-NA-047 applies, consider inspecting the magnetic encoder on the inboard side of the hub for metallic debris before replacing the part.
9. Based on the findings, if the bearing has play, is noisy, or the signal is erratic with good wiring, the wheel hub assembly is the faulty component and should be replaced.
🎬 See this walkthrough for replacing the front hub assembly.

Parts You'll Likely Need

• Front Wheel Hub and Bearing Assembly (OEM #ACDelco Gold 513288 (This is a GM Original Equipment equivalent part)) — This is the most common failure. The wheel speed sensor is integrated into this assembly, and bearing wear is a frequent cause of the C0035 code on this vehicle. A user review for a 2015 Equinox confirmed this 🎬 Watch: How to fix ABS and Stabilitrak lights on AWD models. part as a good value replacement.
  Trusted brands: ACDelco (513288), Timken (HA590316), MOOG (513288), SKF
  OEM price range: $180-$280
  Aftermarket price range: $90-$200

Related Codes That Often Appear With This One

• C0040 — C0040 is the code for the Right Front Wheel Speed Sensor. It's common to see codes for both front wheels if there is a systemic issue like a faulty EBCM or if both hubs are wearing out at a similar rate.
• C0035 5A — Newer GM vehicles may include a two-digit symptom code. '5A' indicates the signal from the sensor is 'not plausible'. This means the EBCM is receiving a signal, but it doesn't make sense when compared to the signals from the other three wheels (e.g., three wheels report 30 MPH and the left front reports 5 MPH or 50 MPH). This strongly points to an erratic signal from a failing bearing or a contaminated encoder ring.

Technical Service Bulletins (TSBs) & Recalls

• PIC5428G: Addresses multiple wheel speed sensor codes (C0035-C0050) and points towards inspection and cleaning of the wheel bearing magnetic encoder as a primary diagnostic step.
• 17-NA-047: This bulletin supersedes and replaces PIC5428G, providing updated information on the same issue and diagnostic procedure.

Platform-Specific Known Issues

• A known issue, addressed in TSB #PIC5428G and its successor #17-NA-047, involves the Electronic Brake Control Module setting various wheel speed sensor codes (C0035-C0050). The bulletin directs technicians to inspect the wheel bearing's magnetic encoder ring for metallic debris. It notes that in many cases, simply cleaning the debris can resolve the issue without replacing the hub. However, due to the labor involved, replacement is often chosen.
• Owner experiences on forums frequently confirm that replacing the entire hub assembly is the definitive fix. One user on ChevroletForum noted that after an initial attempt to replace just the sensor wire failed, the code persisted until the hub itself was replaced.

Mechanic-Grade Diagnostic Values

• Wheel Speed Sensor Supply Voltage — expected: > 11 Volts. Failure: A reading less than 11V suggests an open or short in the signal circuit or a faulty EBCM.
• Wheel Speed Sensor Current Signal (Active Sensor Test) — expected: Switches between a low value of 4-8 mA and a high value of 11-16 mA as the wheel is slowly spun.. Failure: A static reading or one that does not switch correctly indicates a faulty sensor or magnetic encoder ring.
• Wheel Hub Bearing End Play — expected: Less than 0.005 inches. Failure: Measurement exceeding this limit indicates a worn bearing that requires hub replacement.
• Hub Assembly Bolt Torque — expected: 74 ft-lbs. Failure: Improper torque can lead to premature bearing failure or unsafe operation.

Hidden / Shadow Codes Worth Checking

• C0035 0F: Signal Erratic. This indicates the EBCM has detected an erratic wheel speed sensor signal for 0.17 seconds. (see via Professional scan tool (like GM GDS2/Tech2) capable of reading ABS module symptom codes.)
• C0035 18: Low Signal Amplitude. This indicates a missing wheel speed sensor signal is detected for 180 seconds when vehicle speed is greater than 6 mph. (see via Professional scan tool (like GM GDS2/Tech2) capable of reading ABS module symptom codes.)
• C0035 5A: Signal Not Plausible. This means the difference between the fastest and slowest wheel speed is greater than 50% for 30 seconds, indicating the left front reading is illogical compared to the others. (see via Professional scan tool (like GM GDS2/Tech2) capable of reading ABS module symptom codes.)

Scan Tool Commands That Help

• GM GDS2 / Tech2 or equivalent: Live Data - Wheel Speed Sensors — This is the primary diagnostic step. It allows you to monitor the speed of all four wheels simultaneously while driving to confirm if the left front sensor is dropping out, lagging, or reporting an erratic speed compared to the other three.
• GM GDS2 / Tech2 or equivalent: Clear DTCs — After a repair, the codes must be cleared from the EBCM. A key-cycle will not always clear a hard-set ABS fault. A GM-specific tool notes that the 12V driver to the sensor is turned off when a fault is detected, and clearing the code is necessary to re-enable it for testing.

Wiring & Ground Locations

• G103 — Located at the left rear of the engine compartment on the cowl, above the brake booster.. This is a major ground point for the Body Control Module (BCM) and other critical electronics. While not the direct ground for the EBCM, a poor connection here can cause widespread electrical issues that could potentially affect the EBCM's operation or its reference voltages.
• EBCM Ground — Part of the main negative battery cable harness, located at the left front of the engine block.. This is the primary ground for the Electronic Brake Control Module. A loose or corroded connection at this point can cause various ABS codes, including C0035, due to insufficient power or unstable ground reference for the module and its sensors.
• Wheel Speed Sensor Connector — At the wheel hub, connecting the integrated hub sensor to the vehicle's wiring harness pigtail.. This connector is a frequent point of failure due to exposure to water, salt, and vibration. Corrosion on the pins or a loose connection will directly interrupt the sensor signal, causing code C0035. The pigtail itself (e.g., Dorman 970-086) can also fail.

Real Owner Repair Stories

• YouTube user 'DC Auto Enhancement' (2011 Chevrolet Equinox AWD) — ABS light, Traction Control light, Service StabiliTrak message. Scan tool pointed to the right front wheel speed sensor (C0040, but the process is identical for C0035).
  ❌ Tried (didn't work) Replaced the wheel speed sensor wire harness. The code and symptoms remained unchanged.
  ✅ What actually fixed it Upon removing the CV axle, the magnetic encoder ring on the back of the wheel hub assembly was found to be cracked and damaged. Replacing the entire wheel hub assembly (MOOG Part #513288) resolved the issue.

OEM Part Supersession History

• Dorman 970-046 (Right Side) → N/A — N/A
  Heads up: Note: The wiring harness pigtail is available as a separate part from the hub assembly. For the Left Front (C0035), the corresponding part is Dorman 970-086. This is only a fix if the wiring is damaged, not if the sensor in the hub has failed.