C0050 on 2008-2016 Dodge Grand Caravan: Right Rear Wheel Speed Sensor Fault and Fixes

What's Unique About the 2008-2016 Dodge Grand Caravan

For the 2008-2016 Dodge Grand Caravan and its platform-mates (Chrysler Town & Country, Volkswagen Routan), this code commonly points directly to either the wheel speed sensor itself failing or, very frequently, damage to the wiring harness within a few inches of the sensor connector. The sensor is notoriously prone to seizing in the hub due to rust, often breaking during removal and requiring significant effort to extract the remaining piece. Unlike some other vehicles where the magnetic tone ring is a frequent failure point, on this platform, starting with the sensor and its pigtail connector is the most effective diagnostic approach.

Symptoms You May Notice

• ABS warning light is on
• Traction Control or Electronic Stability Control (ESC/ESP) warning light is on
• ABS and traction control systems are disabled
• Cruise control may be inoperative
• Brake pedal may pulse or ABS may activate erratically at very low speeds

Most Likely Causes

1. Failed Right Rear Wheel Speed Sensor 🔴 High Probability → Shop ABS Wheel Speed Sensor The sensor is exposed to harsh conditions (water, salt, debris) at the wheel, leading to internal electronic failure or corrosion. A very common issue is the sensor seizing in the wheel hub due to rust, often causing it to break apart during removal, which complicates the repair.
   How to confirm: Use a scan tool capable of reading ABS live data to monitor all four wheel speeds while driving. If the right rear sensor reads 0 MPH or has an erratic signal while the others read correctly, the sensor is likely bad. You can also test the sensor's internal resistance with a multimeter after disconnecting it; passive sensors on similar vehicles typically have a resistance between 800-2000 ohms.
   Typical fix: Replace the right rear wheel speed sensor. 🎬 Watch: Step-by-step right rear sensor replacement guide. The sensor is held in by a single 5mm Allen bolt. Soaking the old sensor in penetrating oil before attempting removal is highly recommended. If it breaks, the remaining plastic piece must be carefully drilled or chiseled out of the hub.
   Est. part cost: $20-$70
2. Damaged Wiring Harness or Connector 🟡 Medium Probability The wiring leading to the sensor is subject to constant movement and exposure, which can cause wires to break, fray, or corrode. The failure point is often right at the connector or where the harness is secured by clips, leading to an open or short circuit.
   How to confirm: Visually inspect the wiring harness from the sensor to where it enters the vehicle body. Pay close attention to the area near the two-wire connector, which has a red locking tab. Look for any signs of chafing, breaks, or corrosion at the connector pins. Perform a continuity test on the two wires between the sensor connector and the ABS module connector using a multimeter.
   Typical fix: Repair the damaged section of wiring using solder and heat-shrink tubing. If the connector itself is damaged, replace it with a new pigtail connector. A common pigtail part is the Standard Motor Products HP3945.
   Est. part cost: $15-$40
3. Damaged or Debris-Covered Tone Ring ⚪ Low Probability The magnetic tone ring (or reluctor ring) is integrated into the wheel hub bearing assembly. While less common than sensor or wire failure on this van, it can crack, break, or become covered in metallic debris, preventing the sensor from getting a clear reading.
   How to confirm: After removing the wheel speed sensor, use a light to visually inspect the tone ring inside the hub for cracks, missing teeth, or a heavy buildup of rust or debris. Spin the hub to check the entire ring.
   Typical fix: If the tone ring is damaged, the entire wheel hub bearing assembly must be replaced 🎬 Watch: How to replace the sensor and wheel hub. as the ring is an integrated component.
   Est. part cost: $70-$150

Rare But Worth Checking

• Faulty ABS Control Module: → Shop ABS Control Module This is the least likely cause. It should only be considered after the sensor, wiring, and hub assembly have all been confirmed to be in good working order. A faulty module will typically set multiple wheel speed sensor codes or other communication codes, such as U-codes indicating lost communication. Some Dodge/Chrysler platforms of this era are known for ABS module failures that can cause codes like C2116 (Pump Motor Fault).

Diagnosis Steps

1. Connect an OBD-II scanner capable of reading ABS codes to confirm C0050 is present.
2. Using the scanner's live data function, monitor the speed of all four wheels while driving slowly in a straight line. Confirm that the right rear wheel speed sensor is reading differently (e.g., 0 mph or erratically) than the other three sensors.
3. Safely raise and support the vehicle. Perform a thorough visual inspection of the right rear wheel speed sensor and its wiring harness. Look for any obvious damage, corrosion, or loose connections, especially near the connector and clips.
4. If the wiring looks good, disconnect the sensor connector (slide the red tab back first). Remove the 5mm Allen bolt holding the sensor. Attempt to twist and pull the sensor out. Be prepared for it to be seized.
5. If the sensor breaks, the remaining piece must be carefully removed from the hub, often by drilling or breaking it out. Clean the bore thoroughly before installing the new sensor.
6. Inspect the tone ring inside the hub for damage or debris. Spin the hub to check the entire circumference of the ring.
7. If no visual faults are found, use a multimeter to test the sensor. For passive sensors, check resistance across the two pins (expect 900-2000 Ohms). You can also check for AC voltage while spinning the wheel (expect >0.2 VA 🎬 See how to test sensor resistance and voltage.C). These are general values; refer to a service manual for exact specifications.
8. If the sensor tests bad, replace it. It is often recommended to use an OEM Mopar sensor for best results. If the sensor tests good, the fault lies in the wiring or, rarely, the ABS module.
9. After any repairs, clear the code with the scan tool and perform a test drive to ensure the warning lights do not return.

Parts You'll Likely Need

• Rear Wheel Speed Sensor (OEM #68040504AA (This appears to be a wiring part, but is often associated. Verify with dealer)) — This is the most frequent failure point for code C0050 on this vehicle due to its exposed location and electronic nature.
  Trusted brands: Mopar, Dorman (970-087), NTK, Standard Motor Products (SMP)
  OEM price range: $40-$70
  Aftermarket price range: $20-$50
• ABS Wheel Speed Sensor Connector Pigtail (OEM #Standard Motor Products HP3945) — Needed if the original connector or wiring near it is corroded or broken. This is a common failure point.
  Trusted brands: Standard Motor Products, Dorman, ACDelco
  OEM price range: N/A
  Aftermarket price range: $15-$40
• Rear Wheel Hub Bearing Assembly — This part is only needed if the integrated magnetic tone ring is found to be cracked, broken, or severely corroded, which is a less common but possible cause.
  Trusted brands: Mopar, Timken, MOOG, SKF
  OEM price range: $150-$250
  Aftermarket price range: $70-$150

Related Codes That Often Appear With This One

• C0045 — This is the code for the Left Rear Wheel Speed Sensor. Seeing both codes together could point to a shared wiring harness issue or a problem with the ABS module itself.
• U0415 — This code indicates 'Invalid Data Received From ABS Control Module'. It can be triggered as a secondary fault when the ABS module sets a primary code like C0050 because the erratic sensor data is considered invalid.

Platform-Specific Known Issues

• Sensor Seizure and Breakage: A widely reported issue is the rear wheel speed sensor becoming rust-welded into the wheel hub. During removal, the plastic body of the sensor often snaps, leaving the lower portion stuck firmly in the hub. Technicians and DIYers report needing to spend significant time carefully drilling, prying, or chiseling out the broken plastic without damaging the hub or tone ring. Applying penetrating oil beforehand and using a twisting motion can help but is not always successful.
• Aftermarket Sensor Incompatibility: Multiple owner accounts suggest that some aftermarket wheel speed sensors, while physically identical to the OEM part, may not function correctly with the Chrysler/Dodge ABS module. This can lead to the C0050 code persisting even after replacing the sensor. For this reason, many recommend using a genuine Mopar sensor to guarantee compatibility.

Documented NHTSA Reports

While the following reports involve different manufacturers, they provide critical cross-platform context for how code C0050 is interpreted by various diagnostic systems:

• Brake Service Correlation: An owner reported in NHTSA ODI #11649367 that after a brake service, the vehicle disabled the ABS and set code C0050. The technician noted that extra brake fluid required to return caliper piston contact might be related to the fault.
• Associated Component Failures: NHTSA ODI #11693418 describes a diagnostic showing C0050-00 where the rotors, rear brake pads, and adapter plate also required replacement.
• Multiple Sensor Faults: In NHTSA ODI #11228687, an owner noted that C0050 appeared simultaneously with C0035 and C0040, along with several U-codes including U0415.
• Alternative Definitions: It is important to note that on some platforms, C0050 may point to different systems; for example, NHTSA ODI #10763888 describes a case where C0050 identified a problem as a faulty power steering control module (PSCM) requiring a steering column replacement.

Mechanic-Grade Diagnostic Values

• Passive Wheel Speed Sensor Resistance — expected: 900 - 2000 Ohms. Failure: An open circuit (infinite resistance) or a value outside the specified range indicates a failed sensor.
• Passive Wheel Speed Sensor AC Voltage Output — expected: Minimum of 0.2 Volts AC (200 millivolts AC). Failure: Voltage below the minimum threshold when the wheel is spun by hand at approximately 30 RPM (one half-turn per second) suggests a weak sensor or excessive air gap.

Hidden / Shadow Codes Worth Checking

• C0050-00: General circuit malfunction, which could mean an open circuit, short to ground, or high resistance in the sensor wiring. (see via A professional-level scan tool with manufacturer-specific code reading capabilities.)
• C0050-18: Low signal amplitude, indicating a weak or erratic signal from the sensor. This could be caused by a failing sensor, excessive air gap, or a damaged tone ring. (see via A professional-level scan tool with manufacturer-specific code reading capabilities.)
• C0050-5A: Signal Plausibility Failure, meaning the signal from this sensor is not consistent with the signals from the other wheel speed sensors. (see via A professional-level scan tool with manufacturer-specific code reading capabilities.)

Wiring & Ground Locations

• ABS Module Connector — The ABS module is typically located in the engine bay, attached to the hydraulic control unit, which has multiple brake lines running to it.. This is the termination point for the wheel speed sensor wiring. A continuity test should be performed between the sensor connector at the wheel and the corresponding pins at this module connector to rule out a wiring break.
• G304 / G305 — Wiring diagrams for similar Chrysler/Dodge platforms show ground points G304 and G305 located in the rear of the vehicle, often near the C-pillar or D-pillar area, sometimes accessible by removing interior trim panels.. While the sensor circuit is often a dedicated two-wire loop back to the ABS module, poor chassis grounds in the vicinity can sometimes introduce electrical noise that may affect sensitive electronic systems. Verifying these grounds are clean and tight is a good practice during electrical diagnosis.
• Right Rear Sensor Harness Routing — The harness runs from the wheel hub, up the suspension components, and over the exhaust. On the right side, a small heat shield (held by two 8mm bolts) may need to be removed for better access to the wiring and connector.. This is the most likely area for physical damage. Wires can break inside the insulation from repeated suspension movement or chafe against the frame or other components. The area right near the connector is a very common failure point.

Real Owner Repair Stories

• YouTube channel 'scotty kilmer' (2011 Dodge Grand Caravan with 158,000 miles) — ABS and Traction Control lights were on, and cruise control was disabled.
  ❌ Tried (didn't work) The owner suspected the wiring might have been disturbed during recent brake and suspension work.
  ✅ What actually fixed it The owner decided to replace all four wheel speed sensors as a preventative measure due to the vehicle's age and mileage. All but one of the old sensors broke into pieces during removal, highlighting the common seizure issue. Replacing the sensors resolved the warning lights.
• YouTube channel 'ScannerDanner' (2017 GM Truck (demonstrating a similar C0050 diagnostic process)) — ABS and Traction Control lights on, with a current C0050 code.
  ❌ Tried (didn't work) Visual inspection of the harness did not reveal any obvious damage., The wheel speed sensor itself was not the root cause.
  ✅ What actually fixed it Using a graphing multimeter to check continuity while wiggling the harness, the technician found an intermittent open circuit. The wire was broken *inside* the insulation near a harness attachment point. Repairing this hidden wire break fixed the code. This demonstrates the importance of checking for continuity while manipulating the harness to find intermittent faults.

OEM Part Supersession History

• 4721561AC, 4721561AD, 4721561AE → Dorman 970-087 (Aftermarket Cross-Reference) — These are older Chrysler part numbers that are cross-referenced by aftermarket manufacturers to a single replacement part. The Dorman 970-087 is listed as a direct replacement for these and other OEM numbers.
  Heads up: While Dorman 970-087 is listed for the front, the rear sensor is often Dorman 970-050 or similar. It is critical to verify the correct part for the specific wheel location (Front vs. Rear) as they are not interchangeable.

Model Year Variations Within This Range

• 2008-2010: These earlier models offered 3.3L, 3.8L, and 4.0L V6 engines. The ABS system components and diagnosis for C0050 remain fundamentally the same as later models.
• 2011-2016: The 3.6L Pentastar V6 engine became standard. While this was a major powertrain update, the wheel speed sensors and associated ABS components did not significantly change in a way that alters the diagnosis for this specific code.

Diagnostic Flowchart

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this repair, a used part from a salvage yard is generally not recommended for the sensor itself due to its low cost new and high failure rate. However, sourcing a used wiring harness connector/pigtail can be a smart choice if a new pigtail is unavailable or if you need a longer section of factory wiring for a repair.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a wiring pigtail, inspect for any signs of corrosion on the pins.
• Check that the plastic locking tabs are intact and not brittle.
• Ensure the wires are flexible and the insulation is not cracked or chafed.

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

• While not strictly required, many professional technicians and forum users recommend using an OEM Mopar sensor for this vehicle. Some aftermarket sensors have been reported to cause persistent codes, possibly due to slight differences in their internal resistance or signal generation that the Chrysler ABS module does not tolerate.

Aftermarket brands forum-validated for this vehicle:

• NTK/NGK
• Delphi
• Standard Motor Products (SMP)
• Holstein

Brands owners have reported issues with on this vehicle:

• Be cautious with unbranded, 'white-box' sensors from online marketplaces, as their quality and compatibility can be inconsistent.

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 — Indicates the identical fault (bad sensor, wiring, or tone ring) as C0050, but for the Left Front wheel. These sensors are exposed to similar harsh conditions and fail for the same reasons.
• C0040 — Indicates the identical fault (bad sensor, wiring, or tone ring) as C0050, but for the Right Front wheel. It is common for multiple sensors to fail over the life of the vehicle due to corrosion and exposure.
• C0045 — Indicates the identical fault (bad sensor, wiring, or tone ring) as C0050, but for the Left Rear wheel. The causes and diagnostic steps are the same, just performed on the opposite side.
• C0121 — A general ABS/Traction Control system fault code. While C0050 points to a specific sensor, a more serious wiring issue or an internal failure in the ABS module (a rare cause) could potentially trigger this code as well.

Frequently Asked Questions