C0050 on 2007-2014 Chevrolet Tahoe: Right Rear Wheel Speed Sensor Fault Causes and Fixes

What's Unique About the 2007-2014 Chevrolet Tahoe

The 2007-2014 Tahoe (GMT900 platform) uses a wheel speed sensor that is integrated into the sealed wheel hub and bearing assembly. This design makes it particularly susceptible to issues from the hub itself, such as metallic debris contaminating the magnetic encoder ring or bearing failure causing an incorrect air gap. While wiring is a common issue on many cars, on this specific platform, both debris accumulation (addressed in TSB PIC5428G) and complete hub failure are very frequent causes for this code. A less common but critical variation is the presence of RPO code JL4 (Active Brake Control), which uses a different hub assembly than the standard system; using the wrong hub can cause system malfunctions.

Symptoms You May Notice

• ABS warning light illuminated
• StabiliTrak or Traction Control warning light illuminated
• "Service StabiliTrak" or "Service Brake System" message on the Driver Information Center (DIC)
• "Service Steering" message on the DIC, sometimes accompanied by a heavier steering feel at low speeds (a default action when a wheel speed signal is lost)
• ABS and/or traction control are noticeably inactive during driving conditions where they would normally engage

Most Likely Causes

1. Failed Right Rear Wheel Hub & Bearing Assembly 🔴 High Probability → Shop Hub Assembly The wheel speed sensor and its magnetic encoder ring are integrated into the hub assembly. Wear and tear, moisture intrusion, or bearing failure can damage the internal sensor components or the magnetic ring itself, causing signal dropouts. Sometimes the new hub can be faulty out of the box.
   How to confirm: After ruling out wiring and debris, use a scan tool to monitor live data. If the right rear wheel speed reads 0, is erratic, or flat-lines while driving, and the sensor has proper power and ground, the hub assembly is faulty. A grinding or humming noise from the rear that changes with speed also indicates bearing failure.
   Typical fix: Replace the entire right rear wheel hub and bearing assembly. 🎬 Watch this step-by-step guide to replacing the rear hub assembly.
   Est. part cost: $150-$400
2. Damaged or Corroded Wiring/Connector 🟡 Medium Probability The wiring harness is exposed to road debris, moisture, and suspension movement, which can lead to chafing, internal breaks, or corrosion in the connector terminals near the wheel hub. GM TSB PIT5171C also notes intermittent issues can be caused by internal wire breaks in the harness leading to the X411 connector 🎬 See how to diagnose intermittent wiring issues and sensor signals. under the rear of the vehicle.
   How to confirm: Visually inspect the wiring harness from the wheel hub towards the main chassis for any signs of damage. Disconnect the sensor and check for corrosion or bent pins. Use a multimeter to check for continuity and for shorts to power or ground between the EBCM and sensor connector.
   Typical fix: Repair the damaged section of wiring or replace the pigtail connector.
   Est. part cost: $20-$50
3. Debris on Magnetic Encoder Ring 🟡 Medium Probability Metallic debris from brake wear or road grime can stick to the magnetic encoder ring on the inboard side of the hub, disrupting the sensor's reading. This was a common enough issue for GM to issue Technical Service Bulletin PIC5428G. This TSB specifically applies to codes C0035-C0050 with symptom bytes 18, 5A, or 0F.
   How to confirm: Remove the right rear wheel and brake caliper/rotor to visually inspect the back of the wheel hub assembly. Look for a build-up of metallic 'fuzz' on the brown, rubberized magnetic ring.
   Typical fix: Carefully clean the debris from the magnetic encoder ring with a soft, non-magnetic nylon brush and mild soap/water 🎬 Watch: How to clean the magnetic ring without removing wheels. or brake cleaner. Do not use magnetic tools, as they can damage the encoder. If the code returns, the hub is likely failing.
   Est. part cost: $0-$15

Rare But Worth Checking

• Failed Electronic Brake Control Module (EBCM): → Shop ABS Control Module A case study on a 2014 Tahoe showed the EBCM failed to provide the necessary 12-volt supply to the sensor. If you test the sensor connector and find no voltage, and the wiring from the EBCM is confirmed to be good, the EBCM itself could be the root cause, though this is uncommon.
• Loose EBCM Connector: A user on the TahoeYukonForum mentioned that their EBCM connector did not seat well, and even when locked, could be pulled out. Ensuring the connector is perfectly seated resolved multiple codes. This is a simple check to perform before condemning the module itself.

Diagnosis Steps

1. Connect an ABS-capable scan tool. Confirm C0050 is the primary code and check for any symptom bytes (e.g., 0F, 18, 5A) which can point towards a mechanical/debris issue.
2. Use the scan tool to monitor live data from all four wheel speed sensors while driving straight at a slow speed (above 5 mph). Observe if the Right Rear (RR) sensor reads 0 MPH, provides an erratic signal, or flat-lines compared to the other three.
3. Raise and secure the rear of the vehicle. Remove the right rear wheel.
4. Thoroughly inspect the wiring harness leading to the wheel hub for visible damage, chafing, or corrosion. Pay close attention to the connector at the hub and where the harness is secured to the frame.
5. If wiring appears okay, disconnect the sensor. Use a multimeter to check for a 12-volt reference signal and a good ground at the connector coming from the EBCM (with the key on). Lack of voltage could point to a wiring or rare EBCM issue.
6. Remove the brake caliper and rotor to access the inboard side of the hub assembly. Inspect the magnetic encoder ring for metallic debris. Per TSB PIC5428G, clean it with a soft nylon brush and cleaner. Caution: Do not use magnetic tools.
7. If the code persists after cleaning and the wiring/power supply is confirmed good, the wheel hub assembly itself has an internal failure and must be replaced.

Parts You'll Likely Need

• Right Rear Wheel Hub and Bearing Assembly (OEM #ACDelco FW410, GM 15112411, GM 25913202) — This is the most common fix, as the assembly contains the wheel speed sensor and magnetic encoder ring, which are the primary failure points for code C0050.
  Trusted brands: ACDelco (OEM), Timken, MOOG, SKF, Dorman
  OEM price range: $250-$400
  Aftermarket price range: $150-$250

Related Codes That Often Appear With This One

• U0415 - Invalid Data Received From Electronic Brake Control Module —

Technical Service Bulletins (TSBs) & Recalls

• PIC5428G: EBCM Wheel Speed Sensor Diagnostic Aid for ABS Message. This is the most relevant TSB, instructing technicians to inspect and clean metallic debris from the magnetic encoder ring on the hub before replacing parts for codes C0035-C0050.
• PIT5171C: Intermittent ABS/Stabilitrak/Traction Control Lights. Mentions that intermittent codes C0045/C0050 can be caused by internal wire breaks or rodent damage in the harness leading to the X411 connector under the rear of the vehicle.

Platform-Specific Known Issues

• Real-World Repair Story: On TahoeYukonForum.com, a user with a 2010 Suburban reported getting code C0050. They discovered a previous owner had bypassed a section of the factory wiring by running a new set of wires from the sensor down the frame, indicating a hard-to-find break in the original harness. This highlights the importance of checking for previous, non-standard repairs and performing thorough continuity checks on the wiring.

Mechanic-Grade Diagnostic Values

• Wheel Speed Sensor Connector Voltage (Key On) — expected: Approximately 12V on the power wire (often yellow) and a good ground on the return wire (often tan). The EBCM supplies this power.. Failure: No voltage at the connector points to a problem with the wiring harness or the EBCM itself. Note that some systems will cut voltage to the sensor once a fault is stored, requiring a code clear and key cycle to re-test.
• Wheel Speed Sensor Signal (Lab Scope) — expected: A clean digital square wave that toggles between approximately 0V and the supply voltage (e.g., 12V) as the wheel is spun. The frequency of the wave should increase smoothly with wheel speed.. Failure: A missing, erratic, or distorted waveform indicates a faulty sensor/hub assembly.

Hidden / Shadow Codes Worth Checking

• C0050 0F: Signal Erratic. The EBCM detected an illogical or intermittent signal, often caused by a loose connection, wiring damage, or debris on the magnetic ring. (see via ABS-capable scan tool (e.g., Tech2, GDS2, or high-end aftermarket).)
• C0050 18: Low Signal Amplitude. The signal from the sensor is weak, which can be caused by an excessive air gap (e.g., rust on hub mount) or a failing sensor within the hub. (see via ABS-capable scan tool.)
• C0050 5A: Signal Not Plausible. The signal from this sensor is out of sync with the other wheel speed sensors, suggesting it's reading incorrectly (e.g., due to a damaged tone ring or wrong part). (see via ABS-capable scan tool.)

Scan Tool Commands That Help

• GDS2 / High-End Scan Tool: Live Data Graphing — This is the most effective way to diagnose an intermittent C0050. By graphing all four wheel speeds simultaneously during a test drive, a signal dropout or erratic reading from the right rear sensor becomes immediately obvious compared to the steady signals from the other three wheels. A simple numerical display may not catch a momentary glitch.

Wiring & Ground Locations

• EBCM Ground (G103/G110) — On the frame rail, located beneath the driver's side door area.. The Electronic Brake Control Module (EBCM) is highly sensitive to its ground connection. A corroded or loose ground at this point can cause a host of intermittent ABS and StabiliTrak codes, including C0050, even if the sensor and wiring are good. Cleaning this ground point is a crucial step in troubleshooting persistent electronic brake system issues.
• X411 Connector — Under the vehicle on the driver's side frame rail, typically near the rear axle area, behind the fuel tank.. This is a major junction connector for the rear chassis harness. As noted in TSB PIT5171C, its exposed location makes it highly vulnerable to moisture and corrosion, which can cause an open or short in the wheel speed sensor circuit wires (Circuits 882 & 883) that pass through it.
• Right Rear WSS Connector — At the wheel hub, connecting the hub's integrated sensor to the chassis harness.. This is the primary connection point for testing. Pin A (often a Yellow wire) should have ~12V power from the EBCM with the key on. Pin B (often a Tan wire) is the signal return/low reference. Testing here confirms if power is reaching the sensor.

Real Owner Repair Stories

• TahoeYukonForum.com user reports (2007-2014 Tahoe/Suburban/Yukon) — Service StabiliTrak and ABS lights on, code C0050 active.
  ❌ Tried (didn't work) Replacing the right rear wheel hub assembly with a new part.
  ✅ What actually fixed it The mounting surface on the axle where the new hub bolts on had significant rust buildup. This caused the new hub to sit at a very slight angle, increasing the air gap between the internal sensor and the magnetic ring beyond the acceptable tolerance. The fix was to remove the new hub, thoroughly clean all rust from the mounting flange with a wire wheel until it was bare metal, and then reinstall the hub. The code did not return.
• YouTube Repair Channel (Pauly's AUTO) (2014 Chevrolet Equinox (similar GMT platform issue)) — Multiple CAN bus communication faults, including with ABS components.
  ❌ Tried (didn't work) Diagnosing individual modules like the multi-axis sensor.
  ✅ What actually fixed it A wiring harness that runs above the rear differential had rubbed through its protective conduit. The exposed communication wires were shorting out on the chassis, causing widespread communication failures. The fix was to lower the harness and repair the damaged wires. This highlights the importance of inspecting harness routing in hard-to-see areas.
• Mitchell1 SureTrack Community Fix (2014 Chevrolet Tahoe LTZ 5.3L) — ABS light on, code C0050.
  ❌ Tried (didn't work) Visual inspection of wiring., Replacing only the EBCM initially.
  ✅ What actually fixed it A lab scope test revealed no 12V supply from the EBCM to the sensor. After replacing the EBCM, the 12V supply was restored, but the sensor signal was still erratic. This was a rare dual-failure scenario. The final fix required replacing both the EBCM and the right rear wheel hub assembly.

OEM Part Supersession History

• Multiple older GM part numbers → GM 25913202 (common replacement) — Part consolidation and design updates.
  Heads up: Crucially, vehicles with RPO code JL4 (Active Brake Control) require a different hub assembly. While a non-JL4 hub may physically fit, it will not function correctly with the StabiliTrak system and may set fault codes. Always verify the vehicle's RPO codes before ordering.

Model Year Variations Within This Range

• 2007-2014: The primary variation within this generation is not by year, but by option package. Vehicles equipped with the RPO code JL4 (Active Brake Control, part of the StabiliTrak system) use a specific wheel hub assembly. Using a standard hub on a JL4-equipped vehicle, or vice-versa, will lead to system malfunctions and likely set fault codes. The RPO code list is located on a sticker inside the glove compartment.

Diagnostic Flowchart

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this specific repair, a used part is almost never a smart choice. The wheel hub is a wear-and-tear item with a finite lifespan. The labor involved in replacement is significant, making it impractical to risk installing a used part with unknown mileage and history.

What to inspect on the donor part:

• Not applicable; new part is strongly recommended.

Aftermarket brands forum-validated for this vehicle:

• Timken
• SKF
• MOOG
• ACDelco (OEM supplier)

Brands owners have reported issues with on this vehicle:

• Unnamed, generic 'white box' brands from online marketplaces are frequently reported on forums to have high rates of out-of-box failures or premature bearing/sensor failure within months.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• C0045 — This is the counterpart code for the Left Rear wheel speed sensor. It is frequently caused by the exact same issues as C0050: a failed hub assembly, damaged wiring, or debris on the sensor ring. GM TSB PIT5171C specifically mentions both C0045 and C0050 as being caused by the same wiring harness issues.
• C0035 — This code points to the Left Front wheel speed sensor circuit. It shares the same common failure modes, including hub/sensor failure and wiring damage. GM TSB PIC5428G, which advises cleaning the magnetic encoder ring, applies to the entire range of codes from C0035 to C0050.
• C0040 — This code points to the Right Front wheel speed sensor circuit. Like the other wheel speed sensor codes on this platform, it is typically caused by a faulty hub assembly, wiring problems, or debris on the magnetic ring, as outlined in TSB PIC5428G.

Frequently Asked Questions