Damaged or corroded wiring harness or connector at the left side restraints control module; Failed left side restraints control module (internal fault or water intrusion); Blown fuse or poor ground connection supplying power to the module; CAN bus wiring fault (open, short to ground, or short between CAN high and CAN low) on the segment serving the module; Loose or backed-out terminal in a connector along the bus path; Aftermarket accessory installation that disturbed the network wiring or module power; Main body computer (BCM) or gateway module fault preventing communication

DTC codes / U01xx · Lost communication with a control module / U0152

U0152Lost Communication With Side Restraints Control Module Left

Q: What does code U0152 mean?

Lost Communication With Side Restraints Control Module Left. U0152 means the main body computer has lost the controller area network (CAN) communication link with the left side restraints control module, the unit that fires the left-side airbags and seatbelt pretensioners. The computer sets this code when it stops receiving the module's periodic status messages over the network bus.

U0152 means the main body computer has lost the controller area network (CAN) communication link with the left side restraints control module, the unit that fires the left-side airbags and seatbelt pretensioners. The computer sets this code when it stops receiving the module's periodic status messages over the network bus.

SystemNetwork

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaLost communication with a control module

Symptoms you may notice

Airbag warning light illuminated steadily on the instrument cluster
A chime or message on the driver information display warning of a restraint system fault
Left-side airbags and seatbelt pretensioners disabled, so they will not deploy in a crash
Often no symptoms besides the warning light, with the vehicle driving normally
Other unrelated modules may log communication codes if the network bus is disturbed
In some vehicles, remote keyless entry or other body functions may act erratically if the module shares a bus segment

Common causes, most likely first

Damaged or corroded wiring harness or connector at the left side restraints control module
Failed left side restraints control module (internal fault or water intrusion)
Blown fuse or poor ground connection supplying power to the module
CAN bus wiring fault (open, short to ground, or short between CAN high and CAN low) on the segment serving the module
Loose or backed-out terminal in a connector along the bus path
Aftermarket accessory installation that disturbed the network wiring or module power
Main body computer (BCM) or gateway module fault preventing communication

How to diagnose and fix it

Verify battery voltage and check all fuses and grounds related to the restraints system and the left side module
Inspect the left side restraints control module connector for corrosion, water intrusion, or loose terminals
Use a scan tool to read live network data and confirm whether the module is completely offline or intermittently dropping messages
Perform a CAN bus voltage and resistance test at the diagnostic connector and at the module to check for opens or shorts
Check for technical service bulletins (TSBs) or software updates for the restraints module and body computer
If wiring and power are good, substitute a known-good module or perform module programming as required
Clear codes and road-test the vehicle to confirm the communication link is restored and the airbag light stays off

What the airbag light is really telling you

A U0152 code does not always mean the left side module is bad; a single chafed wire or corroded pin in the bus circuit can take the whole module offline.
The left side restraints control module is often powered through a fuse shared with other body functions, so a blown fuse can set this code along with other seemingly unrelated faults.
Water leaks into the kick panel or seat area are a common hidden cause of module connector corrosion on the left side of the vehicle.
After a collision repair, a missing or improperly connected left side module can set U0152 even though the airbag system was never fully reassembled.
Some vehicles require the new module to be configured or learned to the body computer; a replacement module that is not programmed will still set communication codes.

Can I keep driving with U0152?

Because the left-side airbags and pretensioners are disabled while this code is active, the vehicle is not safe to drive in a crash. Have the fault diagnosed and repaired before driving at highway speeds or carrying passengers.

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.