Since grounding issues seem to be expected 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. I cruised at about 45 MPH, the engine dropped to about 500 RPMs, began shuddering, and the SES light came on. The machine did not respond to the gas pedal; at about 15 MPH, it stalled. I got over to the shoulder and tried to restart, but it did nothing. It was like when you tried to start with a completely dead battery; no sound. But I had full electrical power since the lights/radio/air was on. 5 minutes later, it started back up as if nothing had happened. The check Engine light remained on, and until it was looked at by a mechanic was a bit hesitant during acceleration.
I had my mechanic retighten the various connections. He left SES light on (he didn't clear the code). That way, if he didn't fix the issue, a dealer would have the code to go by (dealers won't take your word, they need the code). About a week later, the SES light turned off, and the issue had not returned.
TSB EC06-001A
Relates to DTC U1000/U1001
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 connected with two communication lines (CAN H line and 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."
DTC Detecting Condition
-ECM cannot communicate with other control units.
-ECM cannot communicate for more than the specified time.
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 it.
-Clean/re-tighten ECM ground connections.
-Clean/retighten the 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.
___
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. I cruised at about 45 MPH, the engine dropped to about 500 RPMs, began shuddering, and the SES light came on. The machine did not respond to the gas pedal; at about 15 MPH, it stalled. I got over to the shoulder and tried to restart, but it did nothing. It was like when you tried to start with a completely dead battery; no sound. But I had full electrical power since the lights/radio/air was on. 5 minutes later, it started back up as if nothing had happened. The check Engine light remained on, and until it was looked at by a mechanic was a bit hesitant during acceleration.
I had my mechanic retighten the various connections. He left SES light on (he didn't clear the code). That way, if he didn't fix the issue, a dealer would have the code to go by (dealers won't take your word, they need the code). About a week later, the SES light turned off, and the issue had not returned.
TSB EC06-001A
Relates to DTC U1000/U1001
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 connected with two communication lines (CAN H line and 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."
DTC Detecting Condition
-ECM cannot communicate with other control units.
-ECM cannot communicate for more than the specified time.
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 it.
-Clean/re-tighten ECM ground connections.
-Clean/retighten the 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.
___
vistokid said:
joe said:
This should be covered under the 3/36 bumper-bumper, although you might have to fight for it. This is NOT covered by the powertrain warranty.PearlMurano said:
