C0050 on 2007-2014 Chevrolet Suburban: Right Rear Wheel Speed Sensor Circuit Causes and Fixes

What's Unique About the 2007-2014 Chevrolet Suburban

On the GMT900 platform, which includes the 2007-2014 Suburban, Tahoe, and Silverado, the rear wheel speed sensors are a common failure point. Unlike some other vehicles where a dirty or damaged tone ring on the hub is the primary issue, on these trucks, the sensor itself or the wiring leading to it is more frequently the culprit. The sensor is a standalone part that bolts into the rear axle housing with a single T30 Torx bolt, making it a relatively straightforward replacement compared to designs where it's integrated into the wheel hub assembly. The wiring harness runs up over the frame rail to a connector, and this harness can be susceptible to damage.

Symptoms You May Notice

• ABS warning light is on
• StabiliTrak or Traction Control warning light is on
• "Service StabiliTrak" or "Service Traction Control" message on the Driver Information Center (DIC)
• ABS system may activate incorrectly at low speeds
• Brake pedal may pulsate during normal, low-speed stops
• Cruise control may be disabled

Most Likely Causes

1. Failed Right Rear Wheel Speed Sensor 🔴 High Probability → Shop ABS Wheel Speed Sensor The sensor is exposed to heat from the axle, moisture, and road debris, leading to internal failure over time. It is a very common failure point on this platform.
   How to confirm: Test the sensor's resistance with a multimeter; an open circuit (infinite resistance) or a reading far from the typical spec (often in the 1000-1500 ohm range for this type of sensor) indicates failure. A scan tool can also show no signal or an erratic signal from the right rear wheel while driving.
   Typical fix: Replace the right rear wheel speed sensor. The sensor is held in by a single T30 Torx bolt on the rear axle housing. 🎬 Watch this DIY walkthrough for replacing the rear speed sensor.
   Est. part cost: $25-$60
2. Damaged Wiring or Connector 🟡 Medium Probability The wiring harness runs along the frame and axle, where it is vulnerable to damage from road debris, corrosion, moisture intrusion, or chafing against suspension components or the frame itself. The connector itself can also fill with sand or dirt, leading to a poor connection. Manufacturer service bulletin TSB Bulletin #PIT5499B notes that technicians should specifically inspect the Electronic Brake Control Module connector for water intrusion or corrosion when C0050 is present.
   How to confirm: Visually inspect the wiring from the sensor up to the main harness connector (located on top of the frame rail) for any breaks, chafing, or corrosion in the connector. Perform a continuity test on the two wires between the sensor connector and the EBCM connector if no visible damage is found. Wiggling the harness while monitoring continuity can expose intermittent breaks.
   Typical fix: Repair the damaged section of wire or replace the sensor's pigtail connector. In one documented case, a wire was found to be compromised right at the sensor connector, causing an open circuit.
   Est. part cost: $15-$40
3. Debris on Magnetic Reluctor Ring ⚪ Low Probability While less common on this platform's rear axle than on front hubs, metallic debris from gear wear inside the differential can sometimes accumulate on the reluctor ring (tone ring), disrupting the sensor's reading.
   How to confirm: Remove the sensor and inspect the reluctor ring inside the axle housing with a light and mirror for any metallic shavings or damage.
   Typical fix: Clean the reluctor ring and the sensor's magnetic tip. This may require draining and refilling the differential fluid to clean out all debris.
   Est. part cost: $0-$50 (for fluid)

Rare But Worth Checking

• Failed Electronic Brake Control Module (EBCM): → Shop ABS Control Module This is rare. Before condemning the EBCM, all other possibilities (sensor, wiring) must be exhaustively ruled out. A diagnostic test in one case on a 2014 Tahoe showed no voltage being supplied from the EBCM to the sensor, and even after replacing the module, the new sensor was also found to be faulty, indicating both can fail. Usually, a failed EBCM will present with multiple wheel speed sensor codes.
• Faulty Power Steering Control Module (PSCM): In a cross-manufacturer reference, NHTSA ODI #10763888 describes a case where a C0050 code was diagnosed as a faulty Power Steering Control Module, requiring the replacement of the entire steering column.

Diagnosis Steps

1. Connect an ABS-capable scan tool to the vehicle. Confirm the presence of code C0050 and check for any other related codes or specific symptom bytes 🎬 Watch this breakdown of C0050 code causes and fixes. (e.g., 0F, 18, 5A).
2. Use the scan tool's live data function to monitor the wheel speeds from all four sensors while driving in a straight line. The right rear sensor will likely read 0 MPH or have an erratic signal compared to the other three.
3. Raise the vehicle and locate the right rear wheel speed sensor. It is mounted on the rear axle housing, near the brake assembly, and held by a T30 Torx bolt.
4. Visually inspect the wiring harness and connector leading to the sensor. Follow the harness up over the frame rail to the main connector. Look for any visible signs of damage, chafing, melting, or corrosion. As suggested in TSB Bulletin #PIT5427B, technicians should also inspect the X411 connector for damage or corrosion.
5. If the wiring appears intact, disconnect the sensor. Test the sensor's internal resistance with a multimeter. Compare the reading to the manufacturer's specification or to the reading from the known-good left rear sensor. An open circuit (OL) or significantly different reading indicates a bad sensor.
6. If the sensor tests good, check for voltage at the sensor connector (with the key on). Lack of proper voltage (typically 12V on one pin) points to a wiring issue or a problem with the EBCM. Note that the EBCM may shut down voltage if it detects an open circuit.
7. To definitively test the wiring, disconnect the EBCM connector and the sensor connector. Check for continuity on both wires running between the two connectors. Also check each wire for a short to ground.
8. If wiring and sensor are confirmed good, remove the sensor and inspect the tone ring inside the axle housing for damage or metallic debris.
9. Based on the findings, replace the faulty component (most often the sensor itself or a damaged section of wiring).

Parts You'll Likely Need

• Rear Wheel Speed Sensor (OEM #20938121) — This is the most common failure point for code C0050 on this vehicle. The same part is used for the left and right rear positions.
  Trusted brands: ACDelco (Genuine GM), Dorman (970-041 is for a different application, correct Dorman part is typically 970-0401 or similar, verify by vehicle), NTK, Bosch
  OEM price range: $50-$87
  Aftermarket price range: $25-$50
• Rear Wheel Speed Sensor Connector Pigtail (OEM #19300009 (ACDelco PT2183)) — If the wiring is corroded or damaged at the connector, replacing the pigtail is the standard repair. This is a common point of failure due to moisture and debris.
  Trusted brands: ACDelco, Dorman
  OEM price range: $25-$40
  Aftermarket price range: $15-$30

Related Codes That Often Appear With This One

• C0045 — This is the code for the Left Rear Wheel Speed Sensor. If both appear, it could indicate a shared wiring harness issue or that both sensors are failing due to similar age and conditions. A YouTube video shows a user replacing both rear sensors at the same time as preventative maintenance.
• U0415 — This code indicates 'Invalid Data Received From Electronic Brake Control Module' and can be a secondary code triggered by the primary wheel speed sensor fault. A GM TSB also notes this code can appear alongside wheel speed sensor codes. NHTSA ODI #11228687 reports a vehicle where C0050 appeared simultaneously with U0415 and several other communication codes.
• C0050 0F, C0050 18, C0050 5A — These are manufacturer-specific sub-codes that require a more advanced scanner to read. '0F' indicates an erratic signal, '18' indicates low signal amplitude, and '5A' indicates a signal that is not plausible. They can help pinpoint whether the issue is a weak signal, intermittent connection, or total failure.

Technical Service Bulletins (TSBs) & Recalls

• PIC5428F / 16-NA-062: This TSB addresses wheel speed sensor codes (C0035-C0050) with specific symptom bytes (18, 5A, 0F) caused by ferrous debris on the magnetic encoder ring. While the TSB applies to many GM vehicles, it's more commonly associated with front wheel bearing/hub assemblies. It advises cleaning the ring before replacing parts.
• 21-NA-149 / 21-NA-235: While for newer generation trucks (2019+), these bulletins highlight common wiring harness chafe points on the frame, near control arms, and on engine components that can cause a wide variety of electrical issues, demonstrating a pattern of vulnerability for GM truck harnesses.
• TSB Bulletin #PIT5499B: This bulletin notes that technicians may find code C0050 along with a Service Trailer Brake message on the Driver Information Center, and advises inspecting the EBCM connector for water or corrosion.
• TSB Bulletin #PIT5427B: This record indicates that C0050 may be stored alongside codes for Hard Steering or Service Suspension Control, and suggests inspecting the X411 connector for damage.

Platform-Specific Known Issues

• Owner Replaces Sensor, But Problem Persists: On the Tahoe Yukon Forum, a user with a C0050 code replaced the right rear sensor, but the code immediately returned. This highlights the importance of testing the wiring harness for continuity, as an open or shorted wire will mimic a failed sensor. The issue started for this owner after getting taller tires, but that was likely a coincidence.
• Wiring Harness Chafe and Corrosion: Multiple forums and diagnostic videos emphasize checking the wiring harness thoroughly. A detailed diagnostic video on a similar GM truck found an open circuit by testing continuity from the EBCM connector to the sensor connector. The fault was ultimately traced to corr

Mechanic-Grade Diagnostic Values

• Wheel Speed Sensor Resistance — expected: 800 - 1300 Ohms. Some sources state up to 2,000 Ohms is acceptable. A reading around 1040-1100 Ohms is common for a good sensor.. Failure: An open circuit (OL on multimeter), 0 Ohms (short circuit), or a value significantly outside the expected range.
• Voltage at Sensor Harness Connector (Key On) — expected: Approximately 12V (Ignition Voltage) on one pin (Pin A) and a bias voltage of around 1.0V on the other.. Failure: Absence of 12V power points to a wiring fault or an issue with the EBCM's power supply to the circuit. The EBCM may cut voltage if it detects a short or open.
• Wheel Speed Change Threshold (Symptom Byte 0F) — expected: Change in wheel speed should not exceed 20 km/h (12 mph) in 10 milliseconds.. Failure: The EBCM will set an erratic signal fault (C0050 0F) if the reported speed changes faster than this threshold.

Hidden / Shadow Codes Worth Checking

• C0050 0F: Erratic Signal. The signal is inconsistent or drops out, often pointing to a wiring problem, a loose sensor, or debris on the reluctor ring. (see via Requires a scan tool capable of reading GM-specific chassis codes and symptom bytes, such as a GM Tech2 or GDS2.)
• C0050 18: Low Signal Amplitude. The signal from the sensor is weak, which can be caused by an excessive air gap between the sensor and ring, debris, or a failing sensor. (see via Requires a scan tool capable of reading GM-specific chassis codes and symptom bytes, such as a GM Tech2 or GDS2.)
• C0050 5A: Signal Plausibility Failure. The signal is present but illogical compared to other wheel speed sensors (e.g., reading 5 mph while others read 50 mph). This often points to a damaged/cracked reluctor ring. (see via Requires a scan tool capable of reading GM-specific chassis codes and symptom bytes, such as a GM Tech2 or GDS2.)

Scan Tool Commands That Help

• GM SPS (Service Programming System): Brake System Control Module Reprogramming — This is required after installing a new or used EBCM to program the module to the vehicle's VIN and specific configuration.
• GM Tech2 / GDS2 or equivalent: Module Setup / Automated Bleed — After replacing an EBCM or opening the hydraulic lines, a specific setup procedure and an automated bleed function must be performed to properly configure the module and purge air from the ABS hydraulic unit.

Wiring & Ground Locations

• EBCM (Electronic Brake Control Module) — Mounted to the driver's side frame rail, under the vehicle near the area below the driver's door.. This module is the computer that receives the signal from the right rear wheel speed sensor. All diagnostic wiring tests for the circuit ultimately lead back to this module's connector.
• EBCM Connector (Pins 3 & 4) — The large 38-pin main connector on the EBCM.. According to wiring diagrams, Pin 3 (Green/Yellow wire) and Pin 4 (Violet wire) are the two circuits for the Right Rear Wheel Speed Sensor. These are the specific pins to test for continuity and voltage when diagnosing a circuit fault.
• G303 (EBCM Ground) — Bolted to the outside of the driver's side frame rail, directly below the driver's door area, often near the EBCM itself.. This is the main ground point for the EBCM. Its location makes it highly susceptible to corrosion from road salt and moisture. A poor ground here can cause numerous ABS faults, including communication errors and erratic behavior that could potentially be misdiagnosed as a sensor issue.

Real Owner Repair Stories

• Mitchell1 SureTrack Community Fix (2014 Chevrolet Tahoe LTZ 5.3L) — ABS light was on.
  ❌ Tried (didn't work) Visual inspection of wiring and connector showed no faults.
  ✅ What actually fixed it A compound failure was found. First, testing showed no 12V supply at the sensor connector or at the EBCM output pin, leading to the replacement and programming of the EBCM. After the new EBCM was installed and 12V was restored, a lab scope showed the new sensor signal was still erratic with dropouts. The right rear ABS wheel speed sensor was also faulty and had to be replaced. Both the EBCM and the sensor were bad.
• NHTSA ODI #11228687 — An owner reported that the ABS and Traction Control lights were illuminated. A diagnostic check revealed codes C0035, C0040, and C0050, along with several "U" communication codes including U0415.

OEM Part Supersession History

• 10384745 → 15872664, then 20763148, then 20938121 — Standard part revisions and updates by the manufacturer.
  Heads up: All listed part numbers are considered interchangeable and direct replacements for the rear wheel speed sensor on this platform.

Model Year Variations Within This Range

• 2007-2008: These model years were equipped with the 4-speed 4L60-E automatic transmission.
• 2009-2014: Starting in 2009, the Suburban was equipped with the 6-speed 6L80 automatic transmission, which offered better fuel economy. Other features like blind-spot alert also became available.
• 2014: For the final model year of this generation, the base LS trim gained several previously optional features as standard, including a rearview camera, remote start, and power-adjustable pedals.

Diagnostic Flowchart

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used Electronic Brake Control Module (EBCM) from a reputable salvage yard is a viable option to save significant money over a new unit. The wheel speed sensor is inexpensive enough that buying new is always the recommended and safer choice.

Donor-vehicle mileage cap: roughly under 120000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a used EBCM, source it from a vehicle in a dry, salt-free climate to minimize the risk of internal corrosion.
• Visually inspect the connector pins on the used module for any signs of green or white corrosion, or bent pins.
• Ensure the part number on the used EBCM is an exact match to the original part.

OEM-only on this vehicle (don't cheap out):

• While not strictly OEM-only, many professional technicians and forum users strongly prefer ACDelco (GM's OE brand) for critical electronic components like the EBCM and wheel speed sensors due to higher quality control and reliability compared to some aftermarket brands.

Aftermarket brands forum-validated for this vehicle:

• ACDelco (Professional or GM Original Equipment)
• NTK
• Bosch

Brands owners have reported issues with on this vehicle:

• Dorman has a mixed reputation among DIY and professional communities for electronic parts; while some of their solutions are innovative, their sensors and modules are sometimes cited for premature failure compared to OEM.

Real Owner Stories

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

Related OBD-II Codes

• C0035 — Refers to the Left Front Wheel Speed Sensor Circuit. This code is part of the same family as C0050 and is covered by the same TSB (PIC5428F). It shares identical failure modes, such as sensor failure, wiring damage, or debris on the hub's tone ring.
• C0040 — Refers to the Right Front Wheel Speed Sensor Circuit. As a companion code to C0050, it points to a fault in a different corner of the same system. Diagnosis and common causes are virtually identical, often involving the sensor integrated into the front wheel hub assembly.
• C0045 — Refers to the Left Rear Wheel Speed Sensor Circuit. This is the direct counterpart to C0050 on the opposite side of the axle. Both sensors are identical parts and are susceptible to the same failures from wiring chafe or internal sensor breakdown.

Frequently Asked Questions