AutoCodes – Generic – B1291

B1291 Code - Park Assist Sensor 4

Quick Answer

The Park Assist Sensors (PTS) are ultrasonic transceivers that are completely controlled by the Park Assist Module. Common causes include Faulty Park Assist Sensor 4, Park Assist Sensor 4 harness is open or shorted, Park Assist Sensor 4 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B1291 indicates Park Assist Sensor 4.
Common causes: Common causes include Faulty Park Assist Sensor 4, Park Assist Sensor 4 harness is open or shorted, Park Assist Sensor 4 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 8,873

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1291 Description

The Park Assist Sensors (PTS) are ultrasonic transceivers that are completely controlled by the Park Assist Module. The sensors transmit and receive ultrasonic signals. Each sensor has a voltage, signal, and return the circuit to the module. The sensors communicate with the Park Assist Module using a dedicated serial bus communication circuit. The Park Assist Module monitors the PTS Sensor when the vehicle in reverse and during the self-test while the vehicle is in drive between 18 km/h (11 mph) and 40 km/h (25 mph). The Park Assist Module sets the OBDII code when the Park Assist Sensor Signal circuit is not to factory specifications.

OBDII Code B1291 - Park Assist Sensor 4 - AutoCodes.com — B1291 Code - Park Assist Sensor 4

What does this mean?

What are the Possible Causes of the DTC B1291?

Faulty Park Assist Sensor 4
Park Assist Sensor 4 harness is open or shorted
Park Assist Sensor 4 circuit poor electrical connection
Faulty Park Assist Module

How to Fix the DTC B1291?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

B1291-11 PTS SENSOR 4 CIRCUIT SHORT TO GROUND
B1291-12 PTS SENSOR 4 CIRCUIT SHORT TO BATTERY
B1291-25 PTS SENSOR 4 SIGNAL SHAPE / WAVEFORM FAILURE
B1291-92 PTS SENSOR 4 PERFORMANCE OR INCORRECT OPERATION

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1291 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1291 code?

Need more information on how to fix the B1291 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1291 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1291 Chrysler — Park Assist Sensor 4
B1291 Dodge — Park Assist Sensor 4
B1291 Jeep — Park Assist Sensor 4
B1291 RAM — Park Assist Sensor 4

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1291 Code

1. What are the common symptoms of OBDII code B1291 related to Park Assist Sensor 4?

The common symptoms include the malfunction or complete failure of the Park Assist Sensor 4, leading to inaccurate or absent reverse parking assistance.

2. What are the possible causes of OBDII code B1291 for Park Assist Sensor 4?

The code B1291 can be triggered due to issues such as a faulty Park Assist Sensor 4, damaged wiring harness, or sensor misalignment.

3. How can I diagnose the Park Assist Sensor 4 problem associated with OBDII code B1291?

To diagnose the issue, you can use a diagnostic scanner to read the code, visually inspect the Park Assist Sensor 4 for physical damage, and test the sensor's functionality using a multimeter.

4. What are the repair options for fixing OBDII code B1291 related to Park Assist Sensor 4?

Repair options may include replacing the faulty Park Assist Sensor 4, repairing or replacing damaged wiring, and recalibrating the sensor to ensure proper functionality.

5. Can OBDII code B1291 be cleared/reset, or does it require immediate repair?

While the code can be cleared/reset using a diagnostic scanner, it is advisable to address the underlying issue causing the code (such as Park Assist Sensor 4 malfunction) to ensure your vehicle's safety features work correctly.

6. How important is it to fix OBDII code B1291 for Park Assist Sensor 4?

Fixing the issue associated with OBDII code B1291 is crucial as it affects the functionality of the Park Assist Sensor 4, which plays a significant role in assisting drivers during reverse parking maneuvers.

7. Are there any DIY tips for troubleshooting OBDII code B1291 linked to Park Assist Sensor 4?

You can start by checking the sensor's connections, cleaning the sensor to remove any dirt or debris, and ensuring that the sensor is properly aligned for accurate detection.

8. Can extreme weather conditions affect the performance of Park Assist Sensor 4 and trigger OBDII code B1291?

Yes, extreme weather conditions like heavy rain, snow, or extreme temperatures can impact the performance of Park Assist Sensor 4, leading to the triggering of OBDII code B1291.

9. Is it safe to continue driving with OBDII code B1291 related to Park Assist Sensor 4?

It is not recommended to drive with the code unresolved, as it can compromise the accuracy of your vehicle's Park Assist System, potentially increasing the risk of accidents during parking.

10. How can regular maintenance help prevent OBDII code B1291 issues with Park Assist Sensor 4?

Regularly inspecting and cleaning the Park Assist Sensor 4, along with checking the wiring harness for any signs of wear or damage, can help prevent issues that trigger OBDII code B1291.