Code Definition

P1632 — CAN Bus Off

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Hyundai

About P1632

P1632 is a manufacturer-specific powertrain diagnostic trouble code recorded for Hyundai vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1632 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This DTC is set when the ECM detects that a control module on the CAN (Controller Area Network) bus has entered a bus off state. This happens when a module experiences excessive communication errors and self disconnects from the network to prevent further disruption. The ECM monitors CAN bus integrity, and if a module fails to communicate for a calibrated period, or reattempts are unsuccessful, this fault is logged to indicate a critical communication failure. When this code is present multiple modules may lose communication, several warning lights can appear, and the vehicle may run poorly or...

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