DTC Advanced Diagnostics: U0047(PGM-FI System (2.0L Engine))

DTC U0047: PF-CAN B Malfunction For The Second Channel (BUS-OFF (Powertrain Control Module (PCM)))

General Description

Courtesy of HONDA, U.S.A., INC.

The controller area network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (F-CAN_H and F-CAN_L). When the powertrain control module (PCM) cannot send the signals via the F-CAN lines for a set time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

Execution	Continuous
Sequence	None
Duration	1 second or more
DTC Type	One drive cycle, MIL off

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage [Battery]	10.0 V	-
Vehicle	ON mode

[ ]: HDS Parameter

Malfunction Threshold

The PCM cannot receive any signals via the F-CAN lines for at least 1 second.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

PF-CAN circuit PF-CAN B_H line open
PF-CAN circuit PF-CAN B_L line open
PF-CAN circuit PF-CAN B_H line short to ground
PF-CAN circuit PF-CAN B_L line short to ground
PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory. The MIL does not come on.

Conditions for clearing the DTC

The Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.