C0050 on 2010-2016 Cadillac SRX: Stabilitrak Light Causes and Fixes

What's Unique About the 2010-2016 Cadillac SRX

The second-generation Cadillac SRX, along with its GM Theta platform mates like the Chevy Equinox and GMC Terrain, is particularly susceptible to this code due to two common issues. First, as noted in multiple revisions of GM Technical Service Bulletin #PIC5428, ferrous metallic debris can easily get stuck to the magnetic encoder ring on the wheel hub, disrupting the sensor's reading. Second, the magnetic encoder ring itself, which is integrated into the wheel hub assembly, is known to corrode, crack, or delaminate from heat and age, which also causes a faulty signal. In many cases, the wheel speed sensor itself is not the component that has failed, leading to misdiagnosis.

Diagnostic Flowchart

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

Symptoms You May Notice

• "Service StabiliTrak" message on the dashboard
• "Service Brake Assist" message
• ABS warning light is on
• Traction Control warning light is on
• ABS and traction control are disabled
• A brief, intermittent grinding or ABS pump motor noise at low speeds, even with no codes set.
• Heavier steering feel at low speeds if equipped with electric power steering (RPO NJ2), often setting a U0415 code.

Most Likely Causes

1. Debris on Wheel Hub Magnetic Encoder Ring 🔴 High Probability The design of the hub and sensor makes it susceptible to attracting and holding metallic debris from brake wear and road grime. This is a well-documented issue covered by multiple versions of GM TSB #PIC5428.
   How to confirm: Remove the 10mm bolt holding the right rear wheel speed sensor. Pull the sensor out and use a flashlight and a mirror to inspect the magnetic ring on the inboard side of the wheel hub. Look for a paste-like accumulation of metallic shavings.
   Typical fix: Carefully clean all debris from the magnetic encoder ring using a dry, soft nylon bristle brush or compressed air. Reinstall the sensor, clear the codes, and test drive.
   Est. part cost: $0
2. Damaged Wheel Hub Magnetic Encoder Ring 🟡 Medium Probability The magnetic material is bonded to the steel hub and can break down from corrosion, heat, and age, causing it to crack, peel away, or have missing sections.
   How to confirm: Visually inspect the magnetic encoder ring (after removing the sensor) for cracks, missing chunks, or delamination. If the ring is damaged, the entire hub must be replaced. An erratic signal on a scan tool that isn't fixed by cleaning points to a damaged ring.
   Typical fix: Replace the entire right rear wheel hub and bearing assembly. The encoder ring is not serviced separately. 🎬 Watch: Step-by-step guide to replacing the entire wheel hub assembly.
   Est. part cost: $80-$250
3. Failed Right Rear Wheel Speed Sensor 🟡 Medium Probability → Shop ABS Wheel Speed Sensor
   How to confirm: If the encoder ring is clean and intact, the sensor is the next suspect. Test the sensor's resistance with a multimeter (readings can vary, but an open circuit or short is a clear failure). A better method is to swap it with the left rear sensor (if they are interchangeable) and see if the code changes to C0045 (Left Rear). A technician might use a heat gun on the sensor while monitoring live data to see if the signal drops out when hot, indicating an internal failure.
   Typical fix: Replace the right rear wheel speed sensor. The sensor is typically held in by a single 10mm bolt. 🎬 See this quick walkthrough on replacing the wheel speed sensor.
   Est. part cost: $25-$75
4. Wiring or Connector Damage ⚪ Low Probability
   How to confirm: Visually inspect the wiring harness from the sensor to the main chassis for any cuts, abrasions, or corrosion at the connector. A GM bulletin for platform mates notes that improperly seated terminals in the harness connector on the control arm can cause this code intermittently. A multimeter can be used to check for high resistance or an open circuit in the harness.
   Typical fix: Repair the damaged section of wire or replace the pigtail connector. If terminals are not seated, the connector itself should be replaced for a permanent repair.
   Est. part cost: $15-$50

Rare But Worth Checking

• Faulty Electronic Brake Control Module (EBCM): → Shop ABS Control Module This is very rare. The EBCM would typically set multiple wheel speed sensor codes or other internal fault codes, not just C0050 alone.
• Intermittent Open/High Resistance in Wiring: In some cases, corrosion can build up inside the wiring harness, creating high resistance that only appears under certain conditions (e.g., when warm). This can be difficult to diagnose without advanced tools like an oscilloscope or by performing a bypass test on the wiring harness.

Diagnosis Steps

1. Read the fault codes with an ABS-capable scan tool. Confirm C0050 is present and note any symptom bytes (e.g., 18, 5A, 0F).
2. Use the scan tool's live data function to monitor all four wheel speeds while driving slowly in a straight line. Verify that the right rear wheel speed reading is erratic, jumping, dropping to zero, or not matching the others.
3. Raise and safely support the rear of the vehicle. Remove the right rear wheel.
4. Locate the wheel speed sensor on the rear of the steering knuckle. Disconnect the electrical connector. Remove the 10mm bolt and carefully twist and pull the sensor out.
5. Thoroughly inspect the magnetic encoder ring on the wheel hub using a light and mirror. Look for metallic debris stuck to the ring or any signs of physical damage like cracks, rust jacking, or peeling.
6. If debris is present, clean it off completely with a soft nylon brush, reinstall the sensor, clear the codes, and test drive.
7. If the ring is visibly damaged, the wheel hub assembly must be replaced.
8. If the ring is clean and undamaged, inspect the sensor's wiring harness for damage. Check for a solid connection at the plug and look for corrosion on the pins. Check the harness connector on the upper control arm for unseated terminals.
9. If no visible issues are found, test the sensor itself. A simple test is to swap it with the left rear sensor and see if the code follows to the other side (C0045).
10. If the sensor and hub are confirmed good, perform electrical tests (continuity, short-to-ground) on the wiring harness back to the EBCM to rule out a wiring fault.

Parts You'll Likely Need

• Rear Wheel Hub and Bearing Assembly (OEM #ACDelco FW404 or 13580489) — Required if the integrated magnetic encoder ring is cracked, delaminated, or damaged. This is a common failure point that cannot be fixed by cleaning. Aftermarket part numbers often include 513289.
  Trusted brands: ACDelco, Timken, MOOG, SKP
  OEM price range: $180-$250
  Aftermarket price range: $80-$150
• Rear Wheel Speed Sensor (OEM #25894693) — This part is replaced if it has failed internally, but only after confirming the hub's magnetic ring is clean and intact. Cross-references include 22809910 and 25905089.
  Trusted brands: ACDelco, Delphi, Standard Motor Products (SMP)
  OEM price range: $50-$75
  Aftermarket price range: $25-$50

Related Codes That Often Appear With This One

• U0415 - Invalid Data Received From Electronic Brake Control Module — On SRX models with electric power steering, the loss of a valid wheel speed signal causes the Power Steering Control Module to default to a heavier steering feel as a safety measure, logging this communication code as a result.

Technical Service Bulletins (TSBs) & Recalls

• PIC5428G: Addresses ABS, Service Traction Control, and/or Service Stabilitrak lights with DTCs C0035-C0050, pointing to debris on the wheel bearing's magnetic encoder ring as the likely cause.
• PIC5428H: A later revision of the same bulletin, expanding the model years and reinforcing the diagnostic and cleaning procedure.
• NHTSA ID: 10058249 (related to PIC5428F): Another revision confirming the issue across a wide range of GM vehicles including the SRX, Equinox, and Terrain.

Platform-Specific Known Issues

• A GM Technical Service Bulletin (PIC5428G and its later revisions) was issued for this and many other GM models for codes C0035-C0050. It identifies the primary cause as ferrous metallic debris accumulating on the magnetic encoder ring of the wheel bearing and provides a procedure for cleaning it. The bulletin explicitly states most repairs can be done without replacing any parts.

Mechanic-Grade Diagnostic Values

• Continuity of wheel speed sensor wiring harness — expected: Less than 2.0 ohms. Failure: A reading greater than 2.0 ohms indicates high resistance or an open in the circuit.
• Wheel speed sensor circuit short to ground — expected: Infinite resistance. Failure: A reading of less than infinite resistance indicates a short to ground in the circuit.
• Wheel speed sensor resistance (comparison) — expected: The resistance value should be very close to the value of the sensor on the opposite side of the same axle (e.g., Left Rear).. Failure: A reading that is an open circuit (O.L.), a short (near zero ohms), or significantly different from the opposing sensor suggests a faulty sensor.

Wiring & Ground Locations

• EBCM Connector Pins (Right Rear WSS) — On the Electronic Brake Control Module (EBCM), which is typically located in the front of the engine bay.. For testing the circuit from the control module, the Right Rear Wheel Speed Sensor signal circuit is on pin 2, and the ignition voltage supply is on pin 3.
• WSS Harness Connector Pins — At the wheel speed sensor connector at the right rear wheel.. The signal circuit is on terminal 1 and the ignition voltage circuit is on terminal 2 of the sensor-side harness connector.
• G402 — Located at the rear of the left rear shock tower on the 'D' pillar.. This is a major ground point for multiple rear electronic components. While not directly for the WSS circuit itself, a poor ground here can cause electrical noise and issues with modules that process the WSS data.

Real Owner Repair Stories

• Camaro5 Forums user 'mattisbritish' (2010 Chevrolet Camaro (platform mate)) — ABS light, engine light, traction control light, skid light all on. OnStar reported a fault with the rear wheel sensor.
  ❌ Tried (didn't work) Initial diagnosis pointed to the sensor.
  ✅ What actually fixed it The dealer technician followed GM diagnostic aid PIC542A (a related TSB). They removed the hub assembly and sensor, cleaned debris from the sensor wheel (encoder ring) and sensor, reinstalled the parts, and the C0050 5A code was resolved.
• BeerWrench Garage YouTube Channel (2012 Cadillac CTS (platform mate)) — ABS and Traction Control lights on. Codes C0045 (Left Rear) and C0050 (Right Rear) were present.
  ❌ Tried (didn't work) Replacing only the wheel speed sensors.
  ✅ What actually fixed it The magnetic encoder rings on both rear wheel hub assemblies had worn away and broken into pieces. Replacing both rear wheel hub assemblies resolved the codes.

OEM Part Supersession History

• Not specified → 25894693 — Standard part lifecycle update.
  Heads up: This part number (25894693) is specified for vehicles WITHOUT adaptive cruise control.