U0167

Lost Communication With Vehicle Immobilizer Control Module

Car Fault Codes Network

Can you still drive? With care, short trips only

Who can fix it? Needs a specialist or dealer

Typical repair time 30 minutes – 4 hours

Typical cost SAR 100 to 4,000

What it means

The immobilizer module checks the key's chip and sends the engine computer (ECU) permission to run. This code sets when messages from this module stop reaching the network. On most vehicles this means the engine will not start, or starts for a few seconds and dies, because the computer never received permission. If the code appears while the engine is running, it may not start next time.

Symptoms4

Engine cranks but does not start, or starts then dies after a few seconds.
Security or key light flashing in the cluster.
Message that the key is not recognized.
Engine does not crank at all on some vehicles.

Possible causes6

Weak battery or low voltage during cranking, a very common cause of this code.
Blown immobilizer module power fuse.
Loose or corroded connector at the module or at the key reader antenna around the ignition switch.
Poor ground connection.
Open or shorted network wiring to the module.
Internal module failure or lost programming.

How to diagnose5

Test the battery and measure voltage while cranking, and charge it before any other test.
Try the spare key if available, keeping in mind this code is about module communication, not only the key.
Try to connect to the immobilizer module with a scan tool; if it does not respond, check its fuse, power and ground.
Inspect the module connector and the antenna around the ignition switch, and check the network lines against the manufacturer specification.
Use the service information to see whether the immobilizer is a separate module or built into the BCM, cluster or engine computer.

How to fix6

Charge or replace the battery and clean its terminals.
Replace the blown fuse.
Repair the damaged connector, ground or network wiring.
Have a specialist reprogram the module and keys with the manufacturer tool.
Replace the module if proven faulty, then pair it with the engine computer and keys.
Clear the codes and test starting several times with every key.

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 battery or fuse, rises if the keys need programming, and reaches the upper end when the module is replaced and paired with the computer and keys.

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?

If the engine is running you can drive, but it may not start next time, so go straight to a workshop and avoid shutting it off far from help. If it will not start, the car needs a tow or a mobile technician.

Is the problem in the key?

Not necessarily. A key chip problem usually sets key-specific codes. This code means the immobilizer module itself is not talking on the network, and the most common cause is a weak battery.

Can I fit a used module?

It usually will not work straight away, because the immobilizer is tied to the engine computer and keys, and it needs programming and pairing by a specialist.

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.

Report a mistake

Spotted something inaccurate? Tell us and we will review and correct it.