Car stopped working
Thread Starter
Instructor
Joined: Apr 2014
Posts: 126
Likes: 2
From: Alameda California
Car stopped working
Was driving got reduce power, low fuel, tcs, car then shuts off, Tried to restart the car a bunch of times and nothing. It turns over. I add gas to the car, check all fuses, theres fuel pressure. Still nothing, get home after the car gets towed and find the following codes.
C1276H
U1016H
U1000HC
10 PCM No Comm
Basically theres no communication with the PCM. So now what do I do?
Thanks
Robert
2003 z06
C1276H
U1016H
U1000HC
10 PCM No Comm
Basically theres no communication with the PCM. So now what do I do?
Thanks
Robert
2003 z06
.
Joined: Apr 2013
Posts: 5,047
Likes: 1,160
From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Drifting
Joined: Oct 2002
Posts: 1,774
Likes: 66
From: SoCal
U1016 means no comm with the PCM on the class 2 circuit.
U1000 is the basic no comm code that goes with the U1016 code for the PCM.
As was mentioned need to check connectors, fuses and grounds. Check fuses underhood. PCM fuse 16 and PCM B fuse 23. As for the ground it is G106. From what you said above you did not check that ground. From the ground pic I am looking at it seems to be at the engine passenger side. Also check the Class 2 serial buss connections and STAR connectors if the other things mentioned here do not work. Those are 2 thin connectors by the BCM. Check and see if there is any loose wiring or short there. The one with more wires on it is the one you need to check. Looks like 10 wires coming out of it. Only 4 come out of the other one. The wire you would look for would be Dark Green.
Greg
Last edited by RedRiderZR1; Aug 20, 2014 at 08:44 PM.
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Drifting
Joined: Oct 2002
Posts: 1,774
Likes: 66
From: SoCal
One more thing. Are you sure you have a good battery in the car. These cars do strange things with a weak battery. So be sure it has a good charge. and not a bad battery.
Last edited by RedRiderZR1; Aug 20, 2014 at 09:52 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You either have a CLASS 2 SERIAL DATA BUSS failure or short
OR
You’re missing a power or ground input to the BCM or PCM.
The BCM and PCM are MULTIPLE FUSE supplied. Find ALL the fuses for each module. PHYSICALY remove the fuse and check it with an OHM METER. On top of the fuse are two slots. They are TEST SLOTS.
Use your DC Volt Meter and measure each slot to a known good bare metal chassis ground. The HOT AT ALL TIMES supplied fuses should read full battery voltage all the time
The HOT IN RUN AND START supplied fuses has to have the ignition switch ON to read voltage on those fuses.
You should see FULL Battery voltage on those fuses also.
BC
OR
You’re missing a power or ground input to the BCM or PCM.
The BCM and PCM are MULTIPLE FUSE supplied. Find ALL the fuses for each module. PHYSICALY remove the fuse and check it with an OHM METER. On top of the fuse are two slots. They are TEST SLOTS.
Use your DC Volt Meter and measure each slot to a known good bare metal chassis ground. The HOT AT ALL TIMES supplied fuses should read full battery voltage all the time
The HOT IN RUN AND START supplied fuses has to have the ignition switch ON to read voltage on those fuses.
You should see FULL Battery voltage on those fuses also.
BC
Thread Starter
Instructor
Joined: Apr 2014
Posts: 126
Likes: 2
From: Alameda California
Found this, looks like someone hacked something could this be the issue?
Also I checked the star connectors they look fine.
Where is the class 2 bus connector and what does it look like?
Thanks
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Its difficult to tell from the picture but,,,, If the wires are YELLOW, ORANGE and BLACK,, Thats most likely the AUX power wires GM provided you to connect things to. The yellow is switched 20 amp power, the Orange is hot at all times 20 amp power and the black is ground.
The black tape is how they come from the factory Sometimes silver tape.
Bill
The black tape is how they come from the factory Sometimes silver tape.
Bill
Instructor
Joined: Nov 2011
Posts: 181
Likes: 1
From: Franklin Square NY
Here's a question, what mods have been done to your car?
Also in my limited experience as a mechanic I've encountered this on other cars. When the PCM goes bad on say a crown vic you will plug in your scan tool/computer to the car and you will not get any comm with it. The line that does the "comm" between the OBDII is a direct shot from the port to the PCM. I for one have never seen this line broken.
So, with every single fuse, ground and electrical modification double checked and no comm with a non on board scanner. I would start hunting a new one down.
As for this being a Corvette I would say that I had a column lock code on my 1998 C5 I removed the battery for 2 days one time and had it on a trickle charger put the battery back in and the code and warning is now gone. The only thing you have to lose by doing this is your radio stations.
Edit: Also check the power line to the PCM and see if their is voltage, I suspect there will be.
Also in my limited experience as a mechanic I've encountered this on other cars. When the PCM goes bad on say a crown vic you will plug in your scan tool/computer to the car and you will not get any comm with it. The line that does the "comm" between the OBDII is a direct shot from the port to the PCM. I for one have never seen this line broken.
So, with every single fuse, ground and electrical modification double checked and no comm with a non on board scanner. I would start hunting a new one down.
As for this being a Corvette I would say that I had a column lock code on my 1998 C5 I removed the battery for 2 days one time and had it on a trickle charger put the battery back in and the code and warning is now gone. The only thing you have to lose by doing this is your radio stations.
Edit: Also check the power line to the PCM and see if their is voltage, I suspect there will be.