C0035 on 2013-2020 Chevrolet Malibu: Left Front Wheel Speed Sensor Causes and Fixes

What's Unique About the 2013-2020 Chevrolet MALIBU

For the 8th and 9th generation Malibu, the magnetic reluctor ring (or tone wheel) that the wheel speed sensor reads is integrated directly into the wheel hub and bearing assembly's seal. This design is common for modern vehicles but means that if the ring is damaged, contaminated with metallic debris, or has failed, the entire hub assembly must be replaced. This is a frequent point of failure and often a more likely cause than the standalone sensor itself. TSB PIC5428G specifically notes that metallic debris on this magnetic encoder is a primary cause for this code and that cleaning it may resolve the issue without part replacement.

Diagnostic Flowchart

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

Generation note: The 2013-2020 model years cover two generations of the Chevrolet Malibu: the 8th generation (2013-2016) and the 9th generation (2016-2020). While the C0035 code has the same meaning for both, part numbers for the wheel hub assembly and sensor may differ. For example, the 8th gen (2013-2015) and the 2016 Malibu Limited often use a different front hub than the 9th gen (2016.5-2020) models. 🎬 Watch: How to replace front wheel bearings on 9th gen Malibus Always verify the correct part for your specific year and model.

Symptoms You May Notice

• ABS warning light is on
• "Service StabiliTrak" or "Service ESC" message on the dashboard
• Traction Control warning light is on
• Cruise control may be disabled
• Brake pedal may feel different or harder during hard stops
• AWD OFF message may appear on equipped platform mates

Most Likely Causes

1. Faulty/Damaged Wheel Hub Bearing Assembly 🔴 High Probability The magnetic encoder ring is integrated into the hub's seal. This seal can be damaged by road debris, corrosion, or simple wear and tear, leading to a corrupted signal. Ferrous metal debris sticking to the magnet is a very common cause noted in TSB PIC5428G. Bearing wear can also cause excessive play, leading to an erratic signal. A Reddit user with a similar GM vehicle confirmed their C0035 was caused by rusted-out reluctors on the hub, requiring a full hub replacement.
   How to confirm: With the vehicle raised, grasp the tire at the 12 and 6 o'clock positions and attempt to rock it. Any play or clicking noise indicates a worn bearing. Visually inspect the magnetic encoder ring on the inboard side of the hub for rust, cracks, or metallic debris. TSB PIC5428G suggests cleaning the ring with a soft nylon brush and mild detergent as a first step.
   Typical fix: Replace the entire left front wheel hub and bearing assembly. If only debris is present, cleaning the magnetic ring may be sufficient.
   Est. part cost: $80-$250
2. Damaged Wiring Harness or Connector 🟡 Medium Probability The wiring harness runs down to the wheel and is subject to constant flexing with suspension travel and steering. Wires can break internally inside the insulation, often near the connector or where the harness bends. This is a well-documented issue on platform mates like the Chevrolet Impala, where the break occurs inside the protective loom.
   How to confirm: Visually inspect the wiring from the sensor up into the wheel well for any signs of chafing, breaks, or corrosion. A common failure point is an internal wire break with no visible damage to the outer insulation; pulling gently on the wires at the connector may reveal the insulation stretching, indicating a break inside. A continuity test with a multimeter from the EBCM connector to the sensor connector is the definitive test.
   Typical fix: Repair the broken wire or replace the pigtail connector harness. GM offers a repair harness for this common issue.
   Est. part cost: $15-$40
3. Failed Left Front Wheel Speed Sensor 🟡 Medium Probability The sensor is exposed to harsh conditions, including water, salt, and road debris, which can lead to internal failure or corrosion over time.
   How to confirm: Use a scan tool with live data to monitor the left front wheel speed while driving. If the reading is zero, erratic, or doesn't match the other wheels, the sensor is suspect. You can also test the sensor's resistance with a multimeter (refer to a service manual for specs) or swap it with the right-side sensor to see if the code follows to C0040.
   Typical fix: Replace the left front wheel speed sensor. On some models, this sensor is included with the hub assembly, but for this Malibu it is typically separate.
   Est. part cost: $25-$75

Rare But Worth Checking

• Faulty Electronic Brake Control Module (EBCM): This is an uncommon cause. Before condemning the EBCM, all other possibilities (sensor, hub, wiring) must be thoroughly ruled out. An EBCM failure will often be accompanied by other trouble codes or communication errors.

Diagnosis Steps

1. Connect an OBD-II scanner capable of reading ABS codes to confirm C0035 is present. Note any symptom bytes (e.g., 0F, 18, 5A) which can help pinpoint the fault type.
2. Use the scanner's live data feature to monitor the speed of all four wheels while driving slowly. Confirm that the Left Front wheel speed sensor reading is absent, erratic, or does not match the others.
3. Raise and secure the front of the vehicle. Check the left front wheel for any play by rocking it from top to bottom, which would indicate a bad wheel bearing.
4. Remove the wheel. Visually inspect the wheel speed sensor and its wiring harness for any obvious damage, such as cuts, chafing, or corrosion on the connector pins.
5. Carefully inspect the wiring harness for internal breaks, which are common on these vehicles. Gently pull on individual wires near the connector and flex points; if the insulation stretches, the wire is broken inside.
6. Inspect the wheel hub's magnetic encoder ring (located on the inboard side of the hub) for cracks, damage, or metallic debris. Per TSB PIC5428G, clean it with a soft nylon brush and mild soap, not a magnetic tool.
7. If wiring and the hub appear intact, disconnect the sensor and use a multimeter to check for correct resistance (refer to a service manual for specs) and check for proper voltage (typically 12V) at the harness connector with the key on.
8. Based on the findings, replace the faulty component. If there is play in the bearing, the magnetic ring is damaged, or cleaning does not resolve an erratic signal, replace the entire wheel hub assembly. If wiring is broken, replace the pigtail harness.

Parts You'll Likely Need

• Front Wheel Hub and Bearing Assembly (OEM #23147290 (ACDelco FW409)) — This is the most common failure. The integrated magnetic reluctor ring fails, gets contaminated, or the bearing develops play, causing an incorrect signal. Replacing the whole assembly is the standard repair.
  Trusted brands: ACDelco, MOOG, Timken, Detroit Axle
  OEM price range: $200-$300
  Aftermarket price range: $80-$180
• Front ABS Wheel Speed Sensor (OEM #23483151) — The sensor itself can fail from exposure to the elements. It's a less common failure point than the hub or wiring but should be tested. Note: Fitment for this part number seems to be for the REAR on many models, including the 2013-2015 Malibu, so double-check the front part number for your specific year.
  Trusted brands: ACDelco, Standard Motor Products (SMP), NTK, Delphi
  OEM price range: $50-$80
  Aftermarket price range: $25-$50
• ABS Wheel Speed Sensor Connector (OEM #10340314 (harness)) — The pigtail connector is a high-failure item due to wire fatigue from suspension movement. It often breaks internally without visible external damage. Several aftermarket pigtails are available.
  Trusted brands: ACDelco, Standard Motor Products, Dorman, Wells
  OEM price range: $25-$40
  Aftermarket price range: $10-$25

Related Codes That Often Appear With This One

• C0040 — This is the code for the Right Front Wheel Speed Sensor. If wiring is damaged in an area that affects both front sensors, or if there's a module issue, they can appear together. It's also common to see both front hubs fail around the same time due to similar wear and exposure.
• C0800 — As noted in TSB #PIC5837, this code for the Electronic Brake Control Module can appear alongside C0035, indicating a system-level fault detected by the module.
• U0415 — TSB #PIC5428E notes that on vehicles with electric power steering, a loss of wheel speed sensor signal can cause the Power Steering Control Module to set U0415 (Invalid Data Received From EBCM), resulting in a 'Service Steering' message and heavier steering feel.

Technical Service Bulletins (TSBs) & Recalls

• PIE0533A: Ends a field information request regarding inoperative wheel speed sensors setting C0035, C0040, C0045, and/or C0055. This EI was for 2019-2020 models and focused on harness routing and damage.
• PIC5428G: (Superseded by 17-NA-047) Addresses 'Service Stabilitrak' lights with C0035-C0050 codes, pointing technicians toward cleaning metallic debris from the wheel bearing's magnetic encoder ring as a primary repair strategy before replacing parts.
• PIC5837: Connects 'Service Stability' messages with code C0800 and C0035, advising technicians to follow standard diagnostics for the C0035 code.

Platform-Specific Known Issues

• As noted in TSB #PIC5428G, this code is often associated with 'Service Stabilitrak' lights and may appear with symptom bytes '18' (Low Signal Amplitude), '5A' (Signal Erratic), or '0F' (Erratic Signal), which help technicians pinpoint the exact nature of the circuit fault. The TSB strongly suggests cleaning debris from the magnetic encoder ring before replacing parts.
• TSB #PIE0533A indicates that GM has investigated issues with inoperative wheel speed sensors setting codes like C0035 across various models, including the Malibu.
• A common failure pattern on these vehicles and their platform mates is an internal break in the sensor wiring harness where it flexes, with no visible damage to the outer insulation. Technicians often diagnose this by wiggling the harness while watching live data or by feeling for the wire stretching inside the insulation.

Mechanic-Grade Diagnostic Values

• Wheel Speed Sensor Resistance (Passive Sensor) — expected: Generally between 800 and 2,500 Ohms. Some sources cite up to 3,000 Ohms (3.0k Ohms). A reading of 'OL' indicates an open circuit (failed sensor).. Failure: A reading of infinity/OL (open circuit) or zero Ohms (short circuit). A value significantly outside the expected range also indicates a problem.
• Wheel Speed Sensor AC Voltage Output (Passive Sensor) — expected: At least 100-200 millivolts (0.1-0.2 VAC) when spinning the wheel by hand at about one revolution per second.. Failure: No AC voltage generated while spinning the wheel indicates a dead sensor or a problem with the magnetic ring.
• Voltage at Sensor Harness Connector (Active Sensor) — expected: With the key on and sensor disconnected, one pin should show battery voltage (approx. 12V) and another should show a good ground.. Failure: Absence of 12V power or a good ground points to a wiring or EBCM issue, not a sensor failure.

Hidden / Shadow Codes Worth Checking

• C0035 with symptom byte 5A: The symptom byte '5A' indicates an implausible signal. The EBCM is receiving a signal, but it doesn't make sense compared to the other wheel speeds or vehicle speed (e.g., erratic, choppy, or inconsistent). This often points to a damaged magnetic encoder ring on the hub or debris contamination. (see via A professional scan tool like a GM GDS2/Tech2 or high-end aftermarket scanner that can read manufacturer-specific codes and data.)
• C0035 with symptom byte 18: The symptom byte '18' indicates the signal circuit is open, shorted to ground, or shorted to voltage. This points directly to a wiring issue or a completely failed sensor (internal open/short). (see via A professional scan tool like a GM GDS2/Tech2 or high-end aftermarket scanner.)
• C0035 with symptom byte 0F: The symptom byte '0F' indicates an erratic signal. This is similar to '5A' and suggests the signal is present but unstable, often due to a failing bearing causing hub movement or a contaminated tone ring. (see via A professional scan tool like a GM GDS2/Tech2 or high-end aftermarket scanner.)

Scan Tool Commands That Help

• GM GDS2 / High-End Scan Tool: Live Data Graphing for all four Wheel Speed Sensors — This is the primary diagnostic step. While driving, graph the speed of all four wheels. The left front sensor's graph should be compared to the others. A line that is flat at zero, drops out intermittently, or is very 'noisy'/'choppy' compared to the smooth lines of the other sensors confirms the fault is isolated to the LF wheel circuit.
• GM GDS2 / High-End Scan Tool: Clear ABS Codes — After a repair is performed (e.g., hub, sensor, or wiring replacement), this function must be used to clear the C0035 code from the EBCM's memory. The ABS light will not turn off on its own until the module confirms a good signal over a drive cycle, but clearing the code allows for immediate verification.

Wiring & Ground Locations

• EBCM Connector (X1) — The Electronic Brake Control Module (EBCM) is attached to the ABS hydraulic block, typically located in the engine bay on the driver's side.. This is the termination point for the wheel speed sensor harness. Testing for continuity and shorts should be done from this connector to the sensor connector. For the Left Front WSS, the signal wire is typically at Pin 26 and the low reference (ground) is at Pin 27.
• G110 — On or near the left front of the engine compartment, sometimes on the left radiator support or near the battery tray.. This is a major ground point for several components in the front of the vehicle, including the EBCM on some diagrams. A loose or corroded G110 can cause a variety of difficult-to-diagnose electrical issues, including erratic sensor readings.

Real Owner Repair Stories

• Reddit user mittyatta on r/chevycolorado (Chevrolet Colorado (platform relative)) — ABS light on, code C0035.
  ❌ Tried (didn't work) Replacing the left ABS sensor., Replacing all ABS-related fuses.
  ✅ What actually fixed it The reluctor rings on the wheel hubs were rusted out, which was 'tricking the wheel speed sensor into thinking the wheel was locked up.' Replacing the entire hub assembly resolved the code.
• YouTube video by 'Repairs and Stuff' (2014 Chevy Malibu) — ABS code for right rear speed sensor (C0045), accompanied by a weird noise when the ABS light was on.
  ❌ Tried (didn't work) Replacing only the wheel speed sensor.
  ✅ What actually fixed it Replacing the entire rear wheel hub assembly fixed the issue and eliminated the noise. The code cleared and did not return.

OEM Part Supersession History

• Unknown → 23147290 — Part consolidation and potential design updates over the vehicle's production run.
  Heads up: GM part 23147290 is listed for the front position. It has been superseded by part number 85137056. Always verify the part number with a VIN before ordering.

Model Year Variations Within This Range

• 2013-2016 (8th Gen) vs 2016.5-2020 (9th Gen): The 2016 model year was a transition. The 'Malibu Limited' was a continuation of the 8th generation platform, while the all-new 9th generation was also introduced. These two models use different chassis and suspension components. The front wheel hub assemblies are not interchangeable between a 2016 Malibu Limited and a 2016 (new body style) Malibu. While the C0035 code's meaning is the same, the physical parts (hub, sensor, connectors) may differ. The 9th generation (2017+) also introduced more advanced driver-assistance features that rely on wheel speed data, such as Front Pedestrian Braking.