Since grounding issues seem to be common on the MO, and the answers are spread all over the board, I made a thread specific to the U1000/U1001 Diagnostic Trouble Code (DTC).
Usually this ends up being a loose grounding bolt holding the ECM to the dash bar, causing the ECM to lose ground temporarily. Many with this DTC complained of hesitation, stalling or the engine holding a lower than normal RPM
Description
"CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are conected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only."
Possible Cause
-Harness or connectors (CAN communication line is open or shorted).
When an issue with the CAN arises (at least twice in one trip), it triggers the Service Engine Soon (SES) light on the dash.
TSB EC06-001A Actions
When this code is brought on by a grounding issue, these are the steps the mechanic will follow to remedy.
-Clean/re-tighten ECM ground connections.
-Clean/retighten negative battery cable body connection and battery post connection.
-If needed, clean and ensure good contact between the steering member assembly and the left side instrument stay assembly.
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