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U0152 — Lost Communication Side Restraints Control Module Left

Generic OBD-II · all makesNetwork / communication

U0152 is a network communication fault indicating the powertrain control module (PCM) lost communication with the left side restraints control module (typically the left seat belt pretensioner or side airbag module). This code is set when the PCM can no longer receive valid data messages from this safety system module over the CAN bus network.

Symptoms

What causes it — most likely first

1. Failed left side restraints control module

The left seat belt pretensioner or side airbag module has internal electrical failure and no longer communicates on the CAN bus. This is the most common actual failure.

2. Wiring damage in left door or B-pillar circuit

Broken, chafed, or melted wiring in the circuit between the PCM and left restraints module (common in vehicles with frequent door cycles).

3. Corroded or damaged connector

Moisture intrusion, corrosion, or bent pins at the left restraints module connector or the PCM harness connector.

4. Loss of module power supply

The left restraints module is not receiving proper battery voltage or switched ignition power due to a blown fuse, relay failure, or wiring issue.

5. Poor ground connection

A damaged or corroded ground wire for the left restraints module causing intermittent communication loss.

6. PCM/ECM failure (least likely)

Rarely, the powertrain control module itself may have an internal CAN bus transceiver failure. This should only be considered after all other causes are ruled out.

How it's diagnosed

  1. Scan for all stored diagnostic trouble codes - U0152 often appears with other network communication codes
  2. Check for battery voltage and ground at the left restraints module connector with the ignition on
  3. Inspect all visible wiring in the left door jamb and B-pillar areas for damage, chafing, or corrosion
  4. Measure the resistance of the left seat belt pretensioner circuit (refer to manufacturer specs - often 2-4 ohms)
  5. Perform a CAN bus integrity test at the PCM if multiple modules are unresponsive
  6. Replace the left restraints module (seat belt pretensioner assembly) if voltage, ground, and wiring check OK but communication fails

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0150 — Lost Communication Serial Data GatewayU0151 — Lost Communication Restraints Control U0153 — Lost Communication Side Restraints ConU0154 — Lost Communication Restraints OccupantU0155 — Lost Communication Instrument Panel ClU0156 — Lost Communication Information Center

Frequently asked

Is it true that I need to replace the PCM for U0152?

No. While some may suggest replacing the PCM, this is rarely the cause. The fault is almost always in the left side restraints module itself, its wiring, or connections. The PCM is the last item to suspect and should only be replaced after all other causes are definitively ruled out.

Can I just clear the code and ignore it?

Clearing the code will not fix the underlying problem. The code will return, and more importantly, the left seat belt pretensioner will not function properly in a crash, compromising occupant safety.

Where is the left side restraints control module located?

Location varies by vehicle. It is typically integrated into the left front seat belt pretensioner assembly (located in the B-pillar) or the left side airbag module (often in the left door or left seat). Consult vehicle-specific service information.

Is this code related to the airbag system?

Yes. The side restraints control module is part of the Supplemental Restraint System (SRS). This code will typically illuminate the airbag warning light and may affect deployment of the left side airbags and seat belt pretensioner.