B1297 on 2014-2017 Ram 2500: Park Assist Sensor Fault Causes and Fixes

What's Unique About the 2014-2017 Ram 2500

On Ram 2500 trucks, this code is exceptionally common due to the vehicle's typical use in harsh environments. The park assist sensors, located in the bumpers, are highly susceptible to being covered by mud, snow, and ice. Ram issued a Technical Service Bulletin (TSB #9003059) specifically highlighting that obstructions are a primary cause for this and related sensor codes, often leading to a simple fix of just cleaning the sensor face and the area behind it. [TSB #9003059] Furthermore, the wiring harness for the rear sensors is often cited by owners as being vulnerable to getting pinched between the bumper and the frame, leading to shorts or open circuits.

Diagnostic Flowchart

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

Symptoms You May Notice

• "Service Park Assist System" message on the dashboard.
• The park assist system automatically turns off, and the indicator light on the button illuminates.
• The system does not produce beeping sounds when approaching an obstacle in reverse.
• False alerts, where the system beeps as if an object is present when there is nothing there, especially in rain or cold weather.
• A constant, steady tone when the vehicle is put in reverse, indicating a system fault.

Most Likely Causes

1. Obstructed Park Assist Sensor 🔴 High Probability As heavy-duty trucks, these vehicles frequently encounter mud, snow, and ice, which can easily cake onto the bumper and sensors. A manufacturer TSB specifically calls this out as a primary cause. [TSB #9003059, 2]
   How to confirm: Visually inspect the face of the inner driver-side rear sensor for any dirt, mud, snow, or ice. Clean the sensor thoroughly with soap and water.
   Typical fix: Clean the sensor face with a soft cloth. Clear the trouble code with a scan tool. The system should return to normal operation. In some cases, the code must be cleared with a scan tool before the system will work again, even after cleaning.
   Est. part cost: $0
2. Failed Park Assist Sensor 🟡 Medium Probability The sensor's internal electronics can fail over time due to moisture intrusion, vibration, or age. Water intrusion during rain is a commonly reported failure trigger.
   How to confirm: If cleaning doesn't resolve the code, perform a 'listen test': with the truck in reverse (parking brake on), a healthy sensor will emit a faint clicking or buzzing sound. If the sensor is silent, it is likely bad. To be certain, swap it with an adjacent sensor (e.g., sensor #11). If the code changes to B1298 (for sensor #11), the sensor is confirmed bad.
   Typical fix: Replace the faulty park assist sensor. This is typically done from behind the bumper by releasing retaining clips. 🎬 Watch this walkthrough on how to replace a bumper sensor. Apply dielectric grease to the connector plug to prevent future moisture intrusion.
   Est. part cost: $20-$60
3. Damaged Wiring or Connector ⚪ Low Probability The wiring harness for the rear sensors runs along the bumper and is known to get pinched between the bumper and frame, especially if the bumper has been removed for service. Corrosion at the connector is also common.
   How to confirm: If the trouble code remains for the same sensor position after swapping sensors, the wiring is the likely culprit. Visually inspect the harness and the connector for the #10 sensor for corrosion, bent pins, or broken wires. One owner on RamForum.com found a pinched harness and bent pins in a connector were the root cause of a B1297-11 code.
   Typical fix: Repair the damaged section of wire or replace the connector pigtail. In some cases, the entire rear bumper harness (Mopar P/N 68031820AA) may need replacement. 🎬 Watch a mechanic repair a damaged Ram rear wiring harness.
   Est. part cost: $15-$150

Rare But Worth Checking

• Faulty Park Assist Module (PAM): This is rare. Before suspecting the module, all sensors and wiring should be thoroughly tested. A module failure typically causes issues with multiple sensors simultaneously. The PAM is located behind the driver's side kick panel.
• Blown Fuse: The Park Assist Module is protected by a fuse in the main fuse box (TIPM). On many Ram trucks, this is fuse F95. If the entire system is dead (no lights, no messages), this is worth checking first.
🎬 See this video to quickly locate your park assist fuse.

Diagnosis Steps

1. Read the active DTCs with an OBD-II scanner capable of reading body codes to confirm B1297 is present and check for any specific sub-codes (-11, -12, -25, -92).
2. Visually inspect and thoroughly clean the inner driver-side rear park assist sensor. Also clean the area behind the bumper around the sensor if possible. [TSB #9003059, 32]
3. Check the fuse for the Park Assist system (often F95 in the under-hood fuse box/TIPM).
4. Clear the DTCs with the scan tool and test the park assist system by putting the vehicle in reverse. Note that sometimes the system must be reset by disconnecting the battery for 15 minutes.
5. If the code returns, perform a 'listen test' by putting the vehicle in reverse (parking brake set) and listening for a faint clicking from each sensor. A silent sensor is likely faulty.
6. To confirm a bad sensor, swap the suspect sensor (#10) with an adjacent one (#11, outer driver's side). Clear the codes and re-test. If the code changes to B1298, the sensor is bad. If B1297 returns, the problem is in the wiring.
7. If wiring is suspected, inspect the harness and connector for the #10 sensor position for any visible damage, corrosion, or bent pins. Pay close attention to areas where the harness might be pinched against the frame.
8. If the wiring appears intact, use a multimeter to check for proper voltage supply (approx. 8V) and ground at the sensor connector.
9. If the sensor and wiring are confirmed to be good, the final step would be to investigate the Park Assist Module itself, though this is an uncommon failure.

Parts You'll Likely Need

• Park Assist Sensor (OEM #1EW63WS2AA) — This is the most common part to fail if cleaning the sensor does not resolve the code. The part number 1EW63TZZAA is an interchangeable, unpainted (paint-to-match) version.
  Trusted brands: Mopar, Bosch, Dorman
  OEM price range: $50-$100
  Aftermarket price range: $20-$50
• Rear Bumper Park Assist Wiring Harness (OEM #68031820AA) — Needed if multiple sensors are failing or if a visual inspection reveals the harness is pinched, corroded, or otherwise damaged beyond a simple wire repair.
  Trusted brands: Mopar
  OEM price range: $70-$120
  Aftermarket price range: $40-$80

Related Codes That Often Appear With This One

• B1295, B1296, B1298 — These are codes for the other rear park assist sensors (#8, #9, and #11). If multiple codes appear at once, it strongly suggests a common problem like a damaged wiring harness, a blown fuse, or an issue with the Park Assist Module rather than multiple simultaneous sensor failures.

Technical Service Bulletins (TSBs) & Recalls

• Bulletin #9003059: Addresses Signal Shape / Waveform Failure faults (B1297-25) and recommends checking for and cleaning snow, mud, or ice from the sensors as a first step.
• Bulletin #08-071-14: Involves a software update for the Park Assist Module (PAM) on some 2014 models to address erroneously set DTCs like B1297-25.

Platform-Specific Known Issues

• A Technical Service Bulletin (TSB #9003059) was issued for 2014 models, explicitly stating that codes like B1297-25 can be caused by snow, mud, or ice. The bulletin advises technicians to check for and clean any obstructions from the sensors, both on the front face and behind the bumper, before performing further diagnostics. [TSB #9003059]
• Another TSB (08-071-14) was issued for 2014 Ram 1500s (and Grand Cherokees) built before June 14, 2014, to update the Park Assist Module software to prevent erroneously setting signal/waveform failure codes, including B1297-25.
• Owners on forums frequently report that the park assist system can give false alerts or shut down in very cold or rainy weather, even with clean sensors. This is considered a common quirk of the system.

Mechanic-Grade Diagnostic Values

• Park Assist Sensor Supply Voltage — expected: ~8.4V. Failure: Voltage significantly lower than 8V or 0V indicates an open/short in the supply circuit or a faulty PAM.
• Sensor Signal Circuit Resistance to Ground — expected: Above 10k Ohms. Failure: Resistance below 10k Ohms indicates a short to ground in the signal wire.
• Sensor Signal Circuit Wire Resistance — expected: Below 5.0 Ohms. Failure: Resistance above 5.0 Ohms between the module connector and the sensor connector indicates high resistance or an open in the wire.
• OEM Sensor Resistance (for reference) — expected: ~141 kOhms (pin left to middle), ~51 kOhms (pin left to right). Failure: These are reference values from a known good sensor; significant deviation could indicate a faulty sensor, though swapping sensors remains the most reliable test.

Hidden / Shadow Codes Worth Checking

• B1297-96: PTS Sensor 10 - Component Internal Failure. This is a highly specific code indicating the Park Assist Module has determined the sensor itself has an internal fault, separate from wiring or signal shape issues. (see via This code is typically visible with dealer-level scan tools like wiTECH or advanced aftermarket tools like AlfaOBD that can read manufacturer-specific DTCs.)

Scan Tool Commands That Help

• AlfaOBD / wiTECH: Read DTCs from 'PTS' (Parktronics Sensor) module — This is the first step to identify the specific fault code (e.g., B1297-11, B1297-25) which directs further diagnosis.
• wiTECH: RESTORE VEHICLE CONFIGURATION — This function is used by dealers to reconfigure the Body Control Module (BCM) after the Park Assist Module has been physically disconnected, which is done to permanently disable the system when an aftermarket bumper or flatbed is installed.
• AlfaOBD: Car Configuration Change: 'Park Sense front sensors CSM' and 'Park Sense type' — These settings are adjusted when adding or removing front or rear park assist systems. An incorrect configuration (e.g., set to 'Front and Rear' when only rear is present) can cause system errors.

Wiring & Ground Locations

• Park Assist Module (PAM/PTS) — Behind the driver's side kick panel, near the floor.. This is the control unit for the park assist system. All sensor wiring terminates here. A failure in the module or its main connector can cause single or multiple sensor codes.
• Sensor #10 Signal Wire — White/Dark Green wire running from the sensor to the Park Assist Module.. This specific wire carries the signal from the #10 sensor. A short to ground, short to power, or open circuit on this wire will set a B1297 code, often with a specific sub-code like -11 or -12.
• Sensor Shared Power Wire — Gray/Orange wire that provides power to all four rear sensors.. A fault in this shared power wire would typically cause codes for all four rear sensors, not just B1297.
• Sensor Shared Ground Wire — Gray/Blue wire that provides ground for all four rear sensors.. A fault in this shared ground wire would likely set codes for all rear sensors simultaneously.

Real Owner Repair Stories

• RamForum.com user 'Ram2500_Man' (2015 Ram 2500 Laramie) — Initially, a single sensor would show an object was immediately behind the truck whenever it rained. After inspection, the entire park assist system faulted and shut down.
  ❌ Tried (didn't work) Re-seating all sensor connections did not fix the issue and made it worse (system went from one false alert to full failure).
  ✅ What actually fixed it The root cause was a pinched wiring harness between the bumper and frame, which had also bent pins inside one of the sensor connectors. After repairing the bent pins and clearing the stored B1297-11 (Circuit Short to Ground) code with a scan tool, the system worked perfectly. The user noted the system will not work, even after a physical fix, until the code is cleared.
• YouTube channel 'Fetch A Wrench' (2021 Ram (demonstrates a common 4th/5th gen issue)) — Service Park Assist message with codes for two sensors (B1297-11 and B1298-11).
  ❌ Tried (didn't work) Swapping the suspect sensors with known good ones from other positions. The fault codes remained for the same sensor positions, proving the sensors themselves were not the problem.
  ✅ What actually fixed it A visual inspection of the wiring harness revealed three broken wires inside the loom at a chafe point near the bumper. The wires were soldered, heat-shrunk, and taped. After the repair, the codes were cleared and the system functioned normally.

OEM Part Supersession History

• 1EW631AUAA, 1EW63RXFAA, and others → 1EW63TZZAA — Part consolidation and minor revisions.
  Heads up: 1EW63TZZAA is the unpainted, paint-to-match service part that replaces numerous pre-painted factory part numbers. Functionally, it is a direct replacement.

Model Year Variations Within This Range

• 2014 (built before 06/14/2014): These models may have outdated Park Assist Module (PAM) software that can erroneously set B1297-25 and other waveform failure codes. TSB 08-071-14 was released to update the PAM software to improve fault detection logic.