Damaged, corroded, or disconnected wiring or connector at the particulate filter pressure sensor D or its harness.; Open or short circuit in the CAN bus wiring between the sensor and the module that monitors it.; Failed particulate filter pressure sensor D, including internal electronics that no longer communicate on the bus.; Blown fuse or poor power/ground supply to the sensor or the module that gates its communication.; Water intrusion or physical damage to the sensor or its connector, common on underbody components exposed to road spray.; Software or calibration issue in a control module that causes it to stop polling the sensor, sometimes resolved by a reflash.; A faulty control module on the same network segment that disrupts communication, though this is less common than sensor-side faults.

DTC codes / U06xx · Network communication / U0697

U0697Lost Communication With Particulate Filter Pressure Sensor D

U0697 is a network communication code indicating that a control module on the vehicle's Controller Area Network (CAN) bus has lost contact with the particulate filter pressure sensor designated as 'D'. The computer sets this code when it expects regular data messages from that sensor but does not receive them within the required time window, which is a communication failure rather than a direct sensor performance fault.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaNetwork communication

Symptoms you may notice

Illumination of the check engine light or a dedicated emissions system warning lamp.
Often no symptoms besides the warning light, especially if the sensor is only used for monitoring and not active regeneration control.
Reduced engine power or limp mode on some vehicles when the powertrain control module cannot confirm particulate filter differential pressure.
A message on the driver information display indicating a service emissions system or particulate filter fault.
Possible increase in regeneration frequency or failure to complete a regeneration cycle, leading to soot accumulation over time.
In rare cases, the engine may enter a derate strategy that limits vehicle speed or torque.

Common causes, most likely first

Damaged, corroded, or disconnected wiring or connector at the particulate filter pressure sensor D or its harness.
Open or short circuit in the CAN bus wiring between the sensor and the module that monitors it.
Failed particulate filter pressure sensor D, including internal electronics that no longer communicate on the bus.
Blown fuse or poor power/ground supply to the sensor or the module that gates its communication.
Water intrusion or physical damage to the sensor or its connector, common on underbody components exposed to road spray.
Software or calibration issue in a control module that causes it to stop polling the sensor, sometimes resolved by a reflash.
A faulty control module on the same network segment that disrupts communication, though this is less common than sensor-side faults.

How to diagnose and fix it

Connect a scan tool and read all stored codes in every module, then record freeze-frame data and verify whether U0697 is current or history.
Visually inspect the particulate filter pressure sensor D and its connector for corrosion, water intrusion, loose pins, or chafed wiring, and repair as needed.
Check the sensor's power and ground circuits with a multimeter and confirm battery voltage and a good ground before condemning the sensor.
Perform a CAN bus voltage and resistance check at the sensor connector to rule out an open or short in the communication lines.
If wiring and power supplies are good, substitute a known-good sensor of the same part type and clear codes to see if communication returns.
Clear the code and perform a road test that includes the enable conditions for the particulate filter monitor, then recheck for recurrence.
If the code persists after sensor replacement and wiring checks, follow the manufacturer's diagnostic flow for the control module that reports the loss of communication, including software updates.

Communication codes are not always sensor failures

A U0697 does not automatically mean the particulate filter pressure sensor is bad; a corroded connector pin or a rubbed-through wire on the underbody is a far more common cause on high-mileage vehicles.
Technicians sometimes replace the sensor only to find the same code returns because the real fault is a blown fuse that feeds both the sensor and the module that polls it, so always check power and ground first.
On vehicles with multiple particulate filter pressure sensors, a single lost communication code can be caused by a shared bus segment fault that affects only sensor D, making a wiring diagram essential before parts swapping.
The code can set intermittently from water intrusion after a car wash or heavy rain, and it may not return until the next wet drive, so a dry-weather scan can be misleading.
A control module software bug or a low battery voltage during cranking can cause a false U0697 that clears after a battery recharge and a module reset, so verify system voltage before deeper diagnosis.

Can I keep driving with U0697?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy loads, long trips, and repeated regeneration cycles because the engine may enter a derate strategy or the particulate filter may accumulate soot without proper pressure monitoring. If the engine warning lamp is flashing or the vehicle is in limp mode, stop driving and arrange a tow.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.