B1291 Possible Causes
- 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 do I fix code B1291
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
B1291 Tech NotesB1291-11 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
Cost of diagnosing the B1291 code
Labor: 1.0The cost of diagnosing the B1291 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
B1291 Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B1291 MeaningThe 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.
B1291 More InformationNeed more information on how to fix the B1291 code?
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