C0507 on 2015-2016 Ram ProMaster City: Right Front Wheel Speed Rationality Faults and Fixes

What's Unique About the 2015-2016 Ram PROMASTER CITY

The Ram ProMaster City, based on the Fiat Doblò, has specific factory bulletins addressing this code. While hardware failure (the sensor itself) is common, Ram issued TSBs #18-063-17 REV. A and #18-008-16 REV. B, which indicate that a Powertrain Control Module (PCM) software update is a primary fix. This suggests the vehicle's control modules may be overly sensitive or misinterpreting sensor data, making a software check a crucial diagnostic step alongside hardware inspection. The TSBs address a wide range of rationality codes, including all four wheel speed sensors, indicating a systemic software logic issue 🎬 Watch this walkthrough on performing a transmission shift proxy alignment. rather than isolated hardware problems.

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
• Traction Control or Electronic Stability Control (ESC) warning light is on
• "Service Hill Holder" message may appear on the dash
🎬 Watch: Common causes and solutions for ESC and Hill Holder faults.
• Cruise control is disabled or will not engage
• Brake pedal may feel spongy or different during braking events.

Most Likely Causes

1. Faulty Right Front Wheel Speed Sensor 🔴 High Probability → Shop ABS Wheel Speed Sensor Wheel speed sensors are exposed to harsh conditions (water, debris, heat) leading to eventual failure. This is a common failure item on most modern vehicles. These sensors provide critical data for ABS, ESC, and sometimes even the speedometer.
   How to confirm: Use a diagnostic scan tool to monitor live data from all four wheel speed sensors while driving. If the right front sensor's reading is erratic, drops to zero, or doesn't match the others, the sensor is likely bad. The sensor can also be tested with a multimeter for resistance and the wiring for voltage/ground. 🎬 See how to test ABS sensors for resistance and AC voltage.
   Typical fix: Replace the right front wheel speed sensor. The front left and right sensors are often the same part.
   Est. part cost: $60-$130
2. Outdated Powertrain Control Module (PCM) Software 🟡 Medium Probability → Shop Engine Control Module (ECM) Manufacturer TSBs #18-063-17 REV. A and #18-008-16 REV. B specifically list C0507 as a code that can be resolved by reprogramming the PCM with updated software. This indicates the original software had logic flaws that could falsely trigger rationality codes.
   How to confirm: A Ram dealership or a qualified shop with a wiTECH scan tool can check the current software version of the PCM and determine if an update is available per the TSBs. The TSB explicitly states it is for 'Powertrain Diagnostic and System Improvements'.
   Typical fix: Reprogram the PCM to the latest software version. The TSB notes the flash process takes approximately 6 minutes but requires a stable battery voltage between 13.2 and 13.5 volts.
   Est. part cost: $0 (if under warranty) - $250
3. Damaged Wiring or Connector 🟡 Medium Probability The wiring harness leading to the wheel speed sensor can be damaged by road debris, improper repairs, or corrosion. A recall for 2015-2016 models (NHTSA 16V-202 / FCA S24) regarding a corroded CAN-C bus connector under the driver's seat shows a vulnerability to moisture-related electrical issues on this platform, which can cause widespread communication faults. While not specific to C0507, it establishes a pattern of electrical connector issues.
   How to confirm: Visually inspect the entire length of the wiring from the sensor to the main harness for any cuts, chafing, or melting. Unplug the connector and check for corrosion, moisture, or bent pins. A multimeter can be used to perform a continuity test on the harness.
   Typical fix: Repair the damaged section of wiring or replace the connector pigtail. In the case of the S24 recall, the fix involved inspecting, replacing if corroded, and relocating the main CAN-C connector.
   Est. part cost: $20-$50
4. Damaged or Debris-Covered Tone Ring ⚪ Low Probability The tone ring (or reluctor ring), which the sensor reads, is part of the wheel hub/axle assembly. Rust buildup or a physical crack in the ring can disrupt the magnetic field and cause an erratic signal. This is less common than sensor or wiring failure but is a known possibility.
   How to confirm: Remove the wheel speed sensor and visually inspect the tone ring through the mounting hole for rust, debris, or physical damage like cracks. This may require removing the wheel hub for a full inspection. A borescope can be very helpful for this.
   Typical fix: Clean the tone ring with a wire brush. If it is cracked or damaged, the wheel hub assembly or axle shaft (depending on which component the ring is mounted to) typically needs to be replaced.
   Est. part cost: $150-$250

Rare But Worth Checking

• Failing ABS Control Module: → Shop ABS Control Module While rare, the ABS module itself can fail. This is usually suspected only after all other possibilities (sensor, wiring, software) have been ruled out. A failure here can be due to internal processing errors or communication failures on the CAN bus. It's an expensive last resort.
• Bad Wheel Hub / Bearing: A worn or failing wheel bearing can introduce excessive movement or 'wobble' in the hub assembly. This changes the gap between the speed sensor and the tone ring, leading to an erratic or lost signal and triggering a rationality fault. If you hear grinding or humming noises from the wheel, the bearing should be inspected.

Diagnosis Steps

1. Read all stored fault codes from all vehicle modules with a capable scan tool. Note any other codes present, especially other wheel speed or PCM codes.
2. Using the scan tool, view the live data stream for all four wheel speed sensors. Drive the vehicle slowly (under 10 mph) and observe the readings. The right front sensor should read identically to the left front.
3. If the right front sensor reading is erratic, zero, or absent, proceed with a physical inspection.
4. Raise and safely support the vehicle. Visually inspect the right front wheel speed sensor and its wiring harness for any signs of physical damage, chafing, or corrosion. Pay close attention to where the harness flexes near the suspension.
5. If the wiring looks good, remove the sensor (typically a single bolt) and inspect it for damage or metallic debris. Also, inspect the tone ring on the wheel hub/axle for debris, rust, or cracks using a light and a small mirror or borescope.
6. If no physical damage is found, use a multimeter to test the sensor's resistance (if applicable) and check for proper voltage and ground at the sensor connector with the key on.
7. If all hardware and wiring test correctly, the next step is to check with a Ram dealer or qualified shop if the PCM software is up to date, referencing TSBs #18-063-17 REV. A and #18-008-16 REV. B.
8. If the software is current and the sensor/wiring are confirmed good, the fault may lie with the wheel bearing (check for play) or, as a final step, the ABS control module itself, which requires advanced diagnostics.

Parts You'll Likely Need

• Front Wheel Speed Sensor (OEM #68261733AA) — This is the most common hardware failure for a C0507 code. The front sensors on the ProMaster City are often interchangeable between the left and right sides. This part has been superseded by part number 68621740AA.
  Trusted brands: Mopar, Dorman, NTK, Carquest
  OEM price range: $80-$130
  Aftermarket price range: $50-$90

Related Codes That Often Appear With This One

• C0501 — This is the rationality code for the Left Front wheel speed sensor. Seeing them together could indicate a common issue like a software problem or a systemic wiring fault, as both are mentioned in TSB 18-063-17 REV. A.
• C050D — This is the rationality code for the Left Rear wheel speed sensor, also covered by the same TSB.
• C0513 — This is the rationality code for the Right Rear wheel speed sensor. If multiple wheel speed codes are present, a central issue (like the ABS module or a software glitch) is more likely.
• P2610 — PCM Internal Engine Off Timer Performance. This code is listed alongside C0507 in TSB #18-063-17 REV. A, suggesting the software update addresses them concurrently.
• P1607 — PCM Internal Shutdown Timer Rationality. Also listed in the same TSBs as C0507, pointing to a PCM software issue.

Technical Service Bulletins (TSBs) & Recalls

• 18-063-17 REV. A: Lists C0507 as one of many codes addressed by a PCM software update for Powertrain Diagnostic and System Improvements. Also includes enhancements for catalytic converter operation and A/C clutch cycling.
• 18-008-16 REV. B: Also lists C0507 and other rationality codes as being resolved by a PCM software flash.

Platform-Specific Known Issues

• A known issue documented in TSB #18-063-17 REV. A and #18-008-16 REV. B indicates that a PCM software update may be required to fix this code and other related rationality faults.
• A safety recall (NHTSA ID: 16V202, FCA ID: S24) for a corroding CAN-C bus connector highlights the platform's susceptibility to electrical issues from moisture, which could potentially affect ABS sensor circuits.

Mechanic-Grade Diagnostic Values

• AC Voltage from Sensor — expected: At least 200 mV (0.2 VAC) when spinning the wheel at about one revolution every 2 seconds.. Failure: No AC voltage is generated when spinning the wheel, even though resistance may test as normal.
• Sensor Resistance — expected: No specific value is consistently cited for this exact vehicle, but similar passive sensors are often in the 800-2350 Ohm range. The most effective test is comparing the resistance of the right front sensor to the known-good left front sensor; the values should be very close.. Failure: An open circuit (infinite resistance) or short circuit (zero resistance) indicates a failed sensor. However, a sensor can have a 'correct' resistance value and still be faulty, making the AC voltage test more definitive.

Scan Tool Commands That Help

• wiTECH: Proxi Alignment Procedure — This is mandatory after replacing the ABS control module. It configures the new module to the vehicle's specific VIN and options. Failure to perform this will result in a flashing odometer and non-functional ABS/ESC systems.
• wiTECH: Brake Pedal Calibration — This routine, found in the ABS module's 'Miscellaneous Functions' tab, should be performed after reprogramming the ABS module to ensure the system correctly interprets brake pedal input.
• wiTECH: Longitudinal G-Sensor Calibration — This is another post-flash routine found under the ABS icon that may be required after software updates to ensure the stability control system has correct baseline sensor readings.

Real Owner Repair Stories

• 'Mailman Mechanic' on YouTube (2016 Ram ProMaster City with 77,551 miles, used for mail delivery.) — After replacing inner tie rods, the 'Hill holder fault' and 'Service ESC' messages appeared on the dash.
  ❌ Tried (didn't work) The owner performed the suspension work himself and the error lights appeared immediately after.
  ✅ What actually fixed it Getting a professional wheel alignment performed after the suspension work cleared all the error messages. The vehicle's Electronic Stability Control (ESC) system is highly dependent on the wheel alignment being within specification.

OEM Part Supersession History

• 68261733AA → 68621740AA — Standard part revision by the manufacturer for improvement or supplier change.
  Heads up: The new part number (68621740AA) is the correct service replacement for the original.