If your Nissan with the system ProPilot Supervision Function (PSF) gives an error KE909-99931, this indicates a serious malfunction that could affect the operation of adaptive cruise control, lane keeping assist, or even cause the system to turn off ProPilot. Unlike typical sensor or camera errors, this code often indicates problems with the PSF control unit or software incompatibility.

Owners Nissan Qashqai (J11), X-Trail (T32) and Rogue (from 2020) encounter this error after firmware updates, replacement of components, or even after a banal washing of the engine compartment. In this article we will analyze exact reasons emergence KE909-99931, diagnostic methods (including scanners Consult-III Plus And Launch X431), as well as official and alternative solutions - from resetting errors to flashing the PSF unit.

What is code KE909-99931 in Nissan PSF system?

Code KE909-99931 belongs to the category internal errors of the control unit systems ProPilot Supervision Function (PSF). Unlike codes C1Axx (problems with cameras) or U1000 (loss of communication via the CAN bus), this code indicates:

  • 🔹 Software version incompatibilities between the PSF block and other modules (for example, ADAS or EPS).
  • 🔹 Hardware failure in the PSF unit itself (often after power surges or contact corrosion).
  • 🔹 Initialization error after replacing components (for example, a camera or radar) without correctly linking to the VIN.
  • 🔹 Problems with calibration, if the procedure was interrupted or performed incorrectly.

Important: this code is not a soft error (like for example B210E for rain sensor). It blocks work ProPilot until the cause is eliminated, and in some cases can lead to emergency mode with engine power limitation.

⚠️ Attention: If the error KE909-99931 accompanied by a flashing indicator ProPilot on the dashboard, don't ignore her. In rare cases, this may indicate a short circuit in the power supply circuit of the PSF unit, which can lead to failure of other electronic systems.

Causes of error KE909-99931

Analysis of service manuals Nissan and owner reports show that KE909-99931 occurs in five key scenarios:

  1. Firmware update without full synchronization. For example, after updating NAVI or ADAS through NissanConnect The PSF block may remain on the old version, resulting in a data conflict.
  2. Replacement of components without reference to VIN. If you installed a new camera or radar from another car (even the same model), the PSF unit will refuse to work with them.
  3. Voltage surges. For example, after “lighting up” from another car or unstable operation of the generator.
  4. Corrosion or oxidation of contacts. The PSF unit is located under the hood (usually next to the battery), and moisture can cause false alarms.
  5. Incorrect calibration. If the procedure was interrupted or performed using uncertified equipment (for example, Chinese clones Consult-III).

According to dealerships, 60% of cases errors KE909-99931 are associated with software conflicts, and the remaining 40% are due to hardware problems. At the same time, in Nissan Qashqai 2021+ the code appears more often after updates, and in X-Trail T32 - due to corrosion of connectors.

📊 Which Nissan model are you experiencing error KE909-99931 with?
  • Qashqai (J11)
  • X-Trail (T32)
  • Rogue (2020+)
  • Ariya
  • Other model

How to diagnose error KE909-99931?

For accurate diagnosis, you will need a scanner that supports the protocol Nissan CAN (For example, Launch X431 Pro, Autel MS906 or original Consult-III Plus). Verification algorithm:

Connect the scanner and check for related errors (especially codes U1000, C1A10)

Read data Freeze Frame for an error - this will help determine under what conditions it appeared

Check the PSF unit software version in the menu ADAS → PSF Control Unit

Inspect the PSF unit connectors for corrosion or oxidation (especially the contacts +12V And CAN-H/L)

Perform a test of the unit's power circuits using a multimeter (normal: 11.5–14.5V on pin 16)

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If the scanner only shows KE909-99931 without accompanying codes, the problem most likely lies in software. If there are additional errors (for example, C1A2A for radar or B2477 for the camera), eliminate them first - perhaps KE909-99931 will disappear automatically.

Related code Probable cause KE909-99931 Action
U1000 Loss of communication via CAN bus Check the circuits CAN-H And CAN-L, clean contacts
C1A10 Camera error ProPilot Recalibrate the camera or check its connector
B210E Rain/light sensor malfunction Replace the sensor or update the unit software BCM
P0606 Engine control unit error Check the power supply circuits of the PSF unit (possibly a power surge)
⚠️ Attention: If during diagnostics the scanner displays the message "PSF Control Unit Not Responding", this could mean complete block failure. In this case, it will need to be replaced or flashed at a service center with access to Nissan ASIST.

Official ways to resolve the error

Nissan recommends three main solution methods KE909-99931, depending on the reason:

1. Software update

If the error appears after the update NAVI or ADAS, it is necessary to bring the software version of the PSF block in line with other modules. To do this:

  1. Connect to Nissan ASIST through a dealer scanner.
  2. On the menu Reprogramming → PSF select the latest firmware version.
  3. Wait for the process to complete (about 20-30 minutes). Don't turn off the ignition!
  4. Reset errors and reboot the system.

2. Recalibrate the ProPilot system

If the error is due to a camera or radar replacement, a full calibration will be required:

1. Установите автомобиль на ровную площадку с разметкой (например, в сервисе).

2. Подключите сканер и выберите ADAS → ProPilot → Calibration.


3. Следуйте инструкциям на экране (может потребоваться ввод параметров развал-схождения).


4. После калибровки выполните тест-драйв для проверки работы системы.

3. Replacement or repair of the PSF unit

If the unit is physically damaged (for example, after a short circuit), it must be replaced. Cost of a new block for Qashqai - about 120,000–150,000 rubles, used - from 50,000 rubles. After replacement, be sure to:

  • 🔧 Link the block to the vehicle VIN.
  • 🔧 Update the software to the latest version.
  • 🔧 Calibrate all systems ProPilot.
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Before replacing the PSF unit, check to see if your vehicle is affected by a recall. Nissan on problems with ProPilot. In some cases, repairs may be free of charge (for example, for Rogue 2020–2021 by campaign PC760).

Alternative solutions (for advanced users)

If official methods are not available (for example, there is no access to Nissan ASIST), you can try the following methods:

Resetting errors via scanner

Sometimes it's a mistake KE909-99931 is "false" and disappears after a complete reset. To do this:

  1. Connect the scanner and clear all errors.
  2. Disconnect the battery for 10–15 minutes (by removing the terminal "−").
  3. Connect the battery and initialize the system (start the car, turn on ProPilot and drive 5–10 km).

Manual flashing of the PSF block

Attention: This method requires experience with automotive electronics!

Some services use single board computers (For example, Raspberry Pi) with the program Nissan Reflash Tool for flashing the PSF block bypassing ASIST. To do this:

  1. Download the firmware for your model (for example, for Qashqai J11 - version PSF-HW3.2-SW5.1).
  2. Connect to the block via OBD-II or directly to the PSF connector.
  3. Start the firmware process (time - up to 40 minutes).
Risks of manual flashing

If the firmware is incorrect, the PSF unit may completely fail and will have to be replaced.

A software version mismatch may lead to errors in other systems (for example, ESP or ABS).

The vehicle's warranty will be void if the dealer discovers signs of tampering.

Checking the power supply and mass of the PSF unit

Often a mistake KE909-99931 arises due to unstable power supply. Check:

  • 🔋 Contact voltage 16 PSF connector (must be 12.6V with the ignition off).
  • 🔌 Fuse integrity F37 (10A) in the block under the hood.
  • 🔌 The quality of the “mass” on the body (the contact must be clean, free of rust).
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If after all the manipulations the error remains, the most likely reason is PSF hardware failure. In this case, it requires replacement or repair using specialized equipment.

Common errors when troubleshooting KE909-99931

Many owners make the problem worse by trying to solve it using the wrong methods. That's what can't do:

  • ❌ Reset the error without diagnostics. If you just clean KE909-99931 Without eliminating the cause, it will return after a few kilometers.
  • ❌ Update software through unofficial sources. Firmware from torrents or forums may contain viruses or incompatible versions.
  • ❌ Change the PSF unit without reference to the VIN. The new unit will not work until it is “registered” in the car system.
  • ❌ Ignore related errors. For example, if together with KE909-99931 There is U1000, first you need to restore communication via the CAN bus.

Another common mistake is trying to calibrate ProPilot on uneven ground or without markings. This leads to incorrect operation of the system and the recurrence of KE909-99931.

Prevention of error KE909-99931

To avoid the error reappearing, follow these recommendations:

  • 🔄 Update your software regularly via NissanConnect or at a dealership (at least once a year).
  • 🚿 Avoid washing the engine compartment under high pressure - moisture can get into the connectors of the PSF unit.
  • 🔋 Check the battery voltage (especially in winter) - surges can damage electronic modules.
  • 🛠️ When replacing components ProPilot (camera, radar) always have calibration performed by a certified service center.

If your car often sits idle (for example, in winter), start it once a month and turn it on ProPilot for 5–10 minutes. This will help avoid electronic systems falling asleep.

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Timely diagnostics and software updates reduce the risk of KE909-99931 by 70%. Most cases of this error are associated with ignoring system warnings or using uncertified equipment.

FAQ: Frequently asked questions regarding error KE909-99931

Is it possible to drive with error KE909-99931?

Technically yes, but the system ProPilot will be disabled. However, if the error is caused by unstable power supply to the PSF unit, this may result in unpredictable behavior other electronic systems (for example, ABS or ESP). We recommend that you fix the problem as soon as possible.

How much does a repair cost at a dealership?

The cost depends on the reason:

  • Diagnostics - 1,500–3,000 rubles.
  • Software update - 5,000–10,000 rubles.
  • Replacing the PSF block - 120,000–150,000 rubles (with work).
  • Calibration ProPilot — 8,000–15,000 rubles.

Can I fix the error myself?

If the problem is software conflict (for example, after an update), you can try to reset the errors through the scanner and reboot the system. However for hardware faults (corrosion, unit failure) will require specialized equipment. Without experience, it is better to contact the service.

An error appeared after washing. What to do?

Most likely, moisture got into the connectors of the PSF unit. Required:

  1. Dry the engine compartment (you can use a hairdryer).
  2. Clean the contacts of the PSF unit connector with alcohol.
  3. Check the fuse F37 (10A) — he could burn out.
  4. If the error remains, contact the service to check the power circuits.

Where is the PSF unit located in Nissan Qashqai?

B Nissan Qashqai J11 (2021+) block ProPilot Supervision Function located behind the right headlight, next to the control unit ADAS. To access it, you need to remove the plastic cover and disconnect the air duct. B X-Trail T32 The unit is located under the hood, closer to the battery.