C0035 on 2007-2010 Saturn OUTLOOK: Causes and Fixes for ABS/StabiliTrak Lights

What's Unique About the 2007-2010 Saturn OUTLOOK

The Saturn Outlook and its GM Lambda platform siblings (Chevy Traverse, GMC Acadia, Buick Enclave) use a wheel speed sensor that is integrated into the wheel hub and bearing assembly. Instead of a traditional toothed reluctor ring, these vehicles use a magnetic encoder ring made of magnetized nitrile rubber on the bearing seal. This design makes the sensor highly susceptible to collecting ferrous metallic debris from brake wear and road grime, which can disrupt the magnetic signal and trigger a C0035 code without the hub itself having failed. This specific issue is highlighted in multiple GM Technical Service Bulletins.

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" message is displayed
• "Service Traction Control" message is displayed
• Traction control or stability control system is disabled
• A grinding, clicking, or ratchet noise at low speeds as the ABS incorrectly activates, a symptom explicitly mentioned in TSB PIC5428G.
• In some cases with related power steering systems, a "Service Steering" message may appear.

Most Likely Causes

1. Ferrous Debris on Magnetic Encoder Ring 🔴 High Probability The magnetic encoder ring design naturally attracts metallic particles from brake wear and road grime. GM has issued multiple TSBs (e.g., PIC5428G) specifically for this issue, noting it as a primary cause for codes C0035-C0050.
   How to confirm: Visually inspect the brown magnetic ring on the inboard side of the front left wheel hub for a buildup of metallic shavings or a paste-like substance. This may require removing the brake caliper and rotor for a clear view.
   Typical fix: Carefully clean the magnetic encoder ring with a dry, soft nylon bristle brush. If debris remains, use a mild soap solution and wipe dry. Do not use magnetic tools or harsh chemicals, as they can permanently damage the encoder.
   Est. part cost: $0
2. Failed Wheel Hub and Bearing Assembly 🔴 High Probability → Shop Hub Assembly The wheel speed sensor is permanently integrated into the hub assembly and cannot be replaced separately. Normal wear and tear on the bearing or internal failure of the sensor electronics requires replacement of the entire unit.
   How to confirm: If cleaning the encoder ring doesn't resolve the issue, or if live data from a scan tool shows the left front wheel speed is zero or erratic while driving, the hub assembly is the next likely culprit. A grinding or roaring noise from the wheel that changes with turning can also indicate a worn bearing.
   Typical fix: Replace the left front wheel hub and bearing assembly.
   Est. part cost: $100-$250
3. Damaged Wiring or Connector 🟡 Medium Probability The wiring harness is exposed to road debris, moisture, and constant suspension movement, which can lead to chafing, corrosion in the connector, or broken wires. A common failure is an internal break in the copper wire with no visible damage to the outer insulation, often occurring where the harness flexes.
   How to confirm: Visually inspect the wiring from the back of the hub up into the wheel well. Check for green corrosion inside the connector. A key diagnostic trick is to gently pull or stretch the wire; if it stretches like a rubber band 🎬 Watch: A quick tip for diagnosing GM wheel speed sensor codes., the copper inside is broken. Test for continuity with a multimeter while wiggling the harness to find intermittent breaks.
   Typical fix: Repair the damaged section of wire or replace the pigtail connector. GM offers a repair harness for this common issue.
   Est. part cost: $20-$60

Rare But Worth Checking

• Failed Electronic Brake Control Module (EBCM): → Shop ABS Control Module This is an uncommon cause. An EBCM failure typically triggers multiple wheel speed sensor codes, communication codes (U-codes), or internal fault codes, not just a single code like C0035.
• Damaged Reluctor Ring: While less common on this platform than debris, physical damage to the magnetic encoder ring itself (cracks, demagnetization from improper tools) can cause a C0035. This requires hub replacement.

Diagnosis Steps

1. Connect an OBD-II scanner capable of reading ABS/chassis codes to confirm C0035 is present. Note any other codes and especially any symptom bytes (e.g., 18, 5A, 0F), which strongly point to a mechanical fault like debris per TSB PIC5428G.
2. Use the scanner's live data function to monitor all four wheel speeds while driving slowly (under 10 mph). Confirm that the left front sensor reads 0 mph, has an erratic signal, or doesn't match the other sensors.
3. Raise and secure the front of the vehicle. Remove the left front wheel.
4. Visually inspect the wheel speed sensor wiring harness for any signs of physical damage, chafing, or corrosion at the connector. Perform the 'stretch test' on the wire to check for hidden internal breaks.
5. Remove the brake caliper and rotor to get a clear view of the wheel hub assembly's inboard side.
6. Inspect the brown magnetic encoder ring on the hub for any metallic debris. As per multiple GM TSBs, this is a very common cause.
7. If debris is present, clean it off with a soft, non-magnetic brush and a mild cleaning solution if necessary. Reassemble and re-test.
8. If no debris is found or cleaning does not fix the issue, the wheel hub/bearing assembly is the most likely failure point and should be replaced.
9. If the problem persists after replacing the hub, perform a continuity and resistance check on the wiring harness between the sensor connector and the EBCM to rule out an intermittent open or short circuit.
10. As a final, rare step, consider a faulty EBCM if all other components and wiring test good.

Parts You'll Likely Need

• Front Wheel Hub and Bearing Assembly (OEM #ACDelco FW405 (GM 25903242)) — This assembly contains the integrated wheel speed sensor, which is the most common part to fail (after ruling out debris). It also resolves any underlying bearing wear.
  Trusted brands: ACDelco (OEM), Timken (513276), MOOG (513276), SKF (BR930478)
  OEM price range: $200-$300
  Aftermarket price range: $100-$200
• Front Wheel Speed Sensor Connector Pigtail (OEM #ACDelco PT2298 (GM 19177325), Dorman 645-915) — If the wiring is found to be corroded or broken at the connector, replacing the pigtail is the standard repair.
  Trusted brands: ACDelco, Dorman, Standard Motor Products
  OEM price range: $30-$50
  Aftermarket price range: $15-$30

Related Codes That Often Appear With This One

• C0040 — This is the code for the Right Front Wheel Speed Sensor. Seeing it with C0035 could indicate a systemic issue like debris on both hubs, a wiring harness problem common to both sides, or a failing EBCM.
• U0415 — As noted in TSB PIC5428G, if the vehicle has electric power steering, a loss of a wheel speed sensor signal can cause the Power Steering Control Module to set this code ('Invalid Data Received From EBCM'), resulting in heavier steering feel at low speeds.

Technical Service Bulletins (TSBs) & Recalls

• PIC5428G: EBCM Wheel Speed Sensor Diagnostic Aid for ABS Message. This TSB and its successors are the primary diagnostic resource. It notes that if C0035 is present with symptom bytes 18, 5A, or 0F, the cause is almost certainly debris on the magnetic encoder, which should be cleaned before any parts are replaced.

Platform-Specific Known Issues

• GM Technical Service Bulletin PIC5428G (and its later revisions) directly addresses codes C0035-C0050 on the 2007-2010 Saturn Outlook. It identifies metallic debris on the magnetic encoder ring as a primary cause and recommends inspection and cleaning before parts replacement.

Mechanic-Grade Diagnostic Values

• Digital Sensor Current Signal — expected: Switches between 7mA (Low) and 14mA (High) DC.. Failure: A signal that is stuck high, low, or is non-existent indicates a fault in the sensor or wiring.
• Sensor AC Voltage Output (Analog Test) — expected: At least 200mV (0.2 VAC) when spinning the wheel at about one revolution per second.. Failure: No AC voltage generated while spinning the wheel points to a dead sensor.
• Sensor Internal Resistance — expected: Typically between 800 and 2,500 Ohms, but can vary. Comparing the reading to the sensor on the opposite side of the vehicle is a more practical test.. Failure: An open circuit (OL) or a reading that is drastically different from the opposing wheel's sensor indicates a failed sensor.

Hidden / Shadow Codes Worth Checking

• C0035 5A: The symptom byte '5A' means the wheel speed sensor signal is 'Not Plausible'. The EBCM is receiving a signal, but it doesn't make sense compared to the other wheels (e.g., one wheel reading 5 mph while others read 30 mph). This often points to debris on the encoder ring causing a distorted signal. (see via A professional scan tool like the GM Tech2 or GDS2 is required to read symptom bytes.)
• C0035 0F: The symptom byte '0F' indicates the signal is 'Erratic'. The EBCM is seeing the signal drop in and out intermittently. This is highly indicative of an internal wire break in the harness, a loose connector, or debris causing the sensor to lose its reading periodically. (see via A professional scan tool like the GM Tech2 or GDS2 is required to read symptom bytes.)
• C0035 18: The symptom byte '18' indicates the sensor circuit is 'Open or Shorted to Ground'. This points directly to a wiring issue, a failed sensor coil, or a corroded connector. (see via A professional scan tool like the GM Tech2 or GDS2 is required to read symptom bytes.)

Scan Tool Commands That Help

• GM Tech2 / GDS2 or equivalent: Live Data > EBCM > Wheel Speed Sensors — This is the primary diagnostic step. It allows a technician to view the speed reported by all four wheels in real-time while driving. A faulty left front sensor will read 0, jump erratically, or not match the other sensor readings, confirming the location of the fault before any parts are removed.
• GM Tech2 / GDS2 or equivalent: Clear DTCs — After performing a repair (like cleaning the encoder or replacing a part), this function must be used to clear the C0035 code from the EBCM's memory. The warning lights will not turn off until the code is cleared and the module verifies the repair upon the next drive cycle.

Wiring & Ground Locations

• EBCM Ground — The EBCM and other critical modules are often grounded at location G103, which on similar GM platforms is located in the left rear of the engine compartment, on the cowl, sometimes near the brake booster.. A poor ground at G103 can cause a floating reference voltage for the EBCM, leading to erratic sensor readings and multiple, difficult-to-diagnose fault codes. While not a common cause for a single C0035, it should be checked if the problem persists after replacing the hub and harness.
• Harness Flex Point — The section of the wheel speed sensor harness between the connector at the hub and the first mounting point on the chassis.. This section of wire is constantly flexing with suspension travel and steering input. This leads to internal fatigue and breakage of the copper strands, often with no visible damage to the outer insulation. This is a very common failure point that is often missed during visual inspection.

Real Owner Repair Stories

• YouTube channel 'Keith Perkins' (2014 Chevrolet Impala (similar GM ABS logic)) — ABS and Stabilitrak lights on, code C0035 with symptom byte 0F (erratic signal).
  ❌ Tried (didn't work) Replacing the wheel bearing/hub assembly (twice), Replacing the EBCM (ABS control module), A previous wiring harness repair
  ✅ What actually fixed it The wiring harness pigtail was replaced. The copper wires inside the insulation were broken from flexing, even though the insulation looked undamaged. The technician confirmed this by stretching the wire, which felt like a rubber band, indicating the copper inside was severed.
• BobIsTheOilGuy forum user (2008 Saturn Outlook with 230,000 miles) — ABS light, traction control off, code C0035.
  ❌ Tried (didn't work) Replacing the left front wheel speed sensor.
  ✅ What actually fixed it The thread concluded with other members strongly advising that the issue was either the wheel bearing itself (due to high mileage causing play that the sensor detects) or a wiring fault, not the sensor that was replaced. The final fix was not posted, but the story serves as a caution against replacing only the sensor when the code returns.

When the Usual Fixes Don't Work

• While cleaning debris from the magnetic encoder ring is a primary fix recommended by GM, many owners and technicians report that the issue often returns. This can be due to a bearing seal that is starting to fail and leak grease (which traps more debris) or a bearing that has developed slight play. In these cases, cleaning is only a temporary solution, and the true root cause is the wheel hub assembly itself, which will eventually require replacement. Furthermore, as documented in repair stories, even after replacing the hub, a persistent C0035 code is frequently traced back to an intermittent break in the wiring harness that was missed during initial diagnosis.

OEM Part Supersession History

• PIC5428 → PIC5428G, then 17-NA-047 — GM periodically updated the Technical Service Bulletin to include more model years and refine the diagnostic and cleaning procedures as they gathered more field data on the magnetic encoder debris issue.
• GM 10340314 → ACDelco PT2298 (GM 19177325) — This is the part number for the front wheel speed sensor pigtail/harness. The number was updated over time. Using the latest part number ensures compatibility and incorporates any design improvements.