Pinpoint Test I: U0401:86
WARNING: This page is about a different car, the 2023 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to Module Communications Network
for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Interior Camera System - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition CMR U0401:86 Invalid Data Received from ECM/PCM A: Signal Invalid A continuous memory DTC that sets in the driver status monitor camera module if powertrain data messages from the PCM over the FD-CAN are invalid. Possible Sources
- Communication network concern
- PCM
- I1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Connect the diagnostic tool.
- Using the diagnostic scan tool, perform a network test.
Does the PCM pass the network test?
Yes GO to I2 No REFER to: Controller Area Network (CAN) Module Communications Network - System Operation and Component Description . - I2 RECHECK THE DRIVER STATUS MONITOR CAMERA MODULE CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using the diagnostic scan tool, clear the DTC.
- Ignition OFF.
- Wait 10 seconds.
- Ignition ON.
- Wait 1 minute.
- Using the diagnostic scan tool, check the CMR Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Is DTC U0401:86 retrieved again?
Yes DIAGNOSE any PCM Diagnostic Trouble Codes (DTCs). Refer to the applicable Diagnostic Trouble Code (DTC) Chart. No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.