This code indicates that a control module—typically the Body Control Module or Powertrain Control Module—has received corrupted, implausible, or missing data from Headlamp Control Module B over the serial communication bus. The receiving module detects that the data packets do not match expected values or protocol standards, suggesting a fault within the transmitting module or the network connecting them.
The module's internal circuitry may generate corrupted data packets or fail to transmit valid status messages despite receiving power, causing the receiving module to flag the data as invalid.
Corrosion, moisture intrusion, or chafing in the harness between the headlamp assembly and the vehicle network can interrupt clean data transmission and introduce noise into the communication lines.
High resistance or open ground paths for Headlamp Control Module B can cause voltage fluctuations that distort serial communication signals and create erratic data frames.
Shorts to power, shorts to ground, or open circuits in the CAN or LIN bus lines shared between modules prevent valid data from reaching the receiving controller.
Outdated firmware in either the transmitting or receiving module may cause protocol mismatches that register as invalid data even when hardware is functional.
Rarely, the module logging the code may incorrectly interpret valid data due to internal processing errors, though this is statistically unlikely compared to network or transmitter faults.
Almost certainly not. This code indicates the PCM is correctly detecting invalid data from the headlamp module, meaning the PCM is usually functioning properly. Replacing the PCM is rarely the solution and should only be considered after confirming the headlamp module and all wiring are fault-free.
Generally yes, but headlamp functionality may be degraded. The lighting system typically enters a fail-safe mode. Verify that all required exterior lighting functions comply with local traffic regulations before operating at night.
This designates the secondary headlamp control unit, often associated with the right-side headlamp or specific advanced functions like adaptive driving beams, distinct from Module A which usually controls the left side or primary functions.
Persistent immediate return indicates an active hard fault—usually a completely failed headlamp control module, a severe wiring short, or a loss of power/ground to the module—rather than an intermittent connection.