U0235

Lost Communication With Cruise Control Front Distance Range Sensor

Car Fault Codes Network

Can you still drive? Yes, normally

Who can fix it? Needs a specialist or dealer

Typical repair time 1 hour – 5 hours

Typical cost SAR 150 to 6,000

What it means

This code is set when messages from the front distance sensor (radar) used by adaptive cruise control stop reaching other modules over the network. The sensor measures the distance to the vehicle ahead, so when communication is lost, adaptive cruise control stops working, and often the related forward collision warning systems too.

Symptoms4

Adaptive cruise control unavailable message.
Forward collision warning or automatic emergency braking disabled on equipped vehicles.
Driver assistance warning light on.
Problem sometimes appears after a front-end collision or bumper repair.

Possible causes5

Damaged or corroded sensor connector or wiring at the front of the vehicle from water, a collision or previous bumper work.
Blown sensor power fuse or a poor ground.
Weak battery or low system voltage.
Open or shorted network wiring to the sensor.
Internal failure of the distance sensor (radar).

How to diagnose5

Read codes from all modules and look for other communication codes or low-voltage codes.
Try to connect directly to the sensor with a scan tool.
Inspect the sensor at the front of the vehicle, its connector and wiring, especially after bumper or grille repairs.
Check the sensor fuse and measure power and ground at its connector.
Measure the network line resistance and compare it with the manufacturer specification.

How to fix5

Charge or replace the battery if it is weak.
Replace the blown fuse or repair the ground.
Repair the damaged connector or wiring at the front of the vehicle.
Replace the distance sensor if proven faulty, then calibrate it following the manufacturer procedure.
Clear the codes, test adaptive cruise control on the road and confirm the code does not return.

Repair cost

0–500

500–2,000

2,000–5,000

5,000+

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low for a connector or fuse, and rises sharply if the sensor must be replaced and calibrated with special equipment.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

Can I drive with this code?

Yes. Brakes and steering work normally, but adaptive cruise control and forward warning systems may not work, so do not rely on them until the repair.

Why does a new sensor need calibration?

The sensor must point precisely forward, and a small misalignment makes it measure distance wrongly. That is why manufacturers require calibration after installation or front-end repairs.

This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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