No comm when first start up CODES ALOT
Thread Starter
Le Mans Master
Joined: Jul 2010
Posts: 6,013
Likes: 726
No comm when first start up CODES ALOT
This happens every first start up if the car sit more then a few hours.
TCS- u1016 H, u1301 H
BCM- u1255 H, u1016 H,C, u1096 H
SDM- u1000 H, u1301 H, u1016 H, u1096 H
IPC- u1255 H, u1064 H, u1164 H, u1176 H, u1088 H, u1040 H, u1016 H
B0-RFA- u1096 H, u1064 H, u1016 H
This happens every morning. Car starts fine and runs fine.
TCS- u1016 H, u1301 H
BCM- u1255 H, u1016 H,C, u1096 H
SDM- u1000 H, u1301 H, u1016 H, u1096 H
IPC- u1255 H, u1064 H, u1164 H, u1176 H, u1088 H, u1040 H, u1016 H
B0-RFA- u1096 H, u1064 H, u1016 H
This happens every morning. Car starts fine and runs fine.
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
As strange as it sounds, fully charge the battery then, remove the battery and have it load tested and checked for reserve capacity and recovery rate.
When you crank the engine "especially a cold engine" the starter draws the most current. If your battery is not up to par, the battery output can drop really low and cause module issues and lots of U series DTCs
Give that a check.
Before you fully reconnect the battery obtain a DC Amp meter and do a sleep mode current test and see what your sleep mode current is. Should be 20 milliamps or less.
If its much above 20 ma it can pull down a battery a lot faster than it should.
Bill
When you crank the engine "especially a cold engine" the starter draws the most current. If your battery is not up to par, the battery output can drop really low and cause module issues and lots of U series DTCs
Give that a check.
Before you fully reconnect the battery obtain a DC Amp meter and do a sleep mode current test and see what your sleep mode current is. Should be 20 milliamps or less.
If its much above 20 ma it can pull down a battery a lot faster than it should.
Bill
Last edited by Bill Curlee; Jul 23, 2013 at 10:50 PM.
Thread Starter
Le Mans Master
Joined: Jul 2010
Posts: 6,013
Likes: 726
As strange as it sounds, fully charge the battery then, remove the battery and have it load tested and checked for reserve capacity and recovery rate.
When you crank the engine "especially a cold engine" the starter draws the most current. If your battery is not up to par, the battery output can drop really low and cause module issues and lots of U series DTCs
Give that a check.
Before you fully reconnect the battery obtain a DC Amp and do a sleep mode current test and see what your sleep mode current is. Should be 20 milliamps or less.
If its much above 20 ma it can pull down a battery a lot faster than it should.
Bill
When you crank the engine "especially a cold engine" the starter draws the most current. If your battery is not up to par, the battery output can drop really low and cause module issues and lots of U series DTCs
Give that a check.
Before you fully reconnect the battery obtain a DC Amp and do a sleep mode current test and see what your sleep mode current is. Should be 20 milliamps or less.
If its much above 20 ma it can pull down a battery a lot faster than it should.
Bill
Thread Starter
Le Mans Master
Joined: Jul 2010
Posts: 6,013
Likes: 726
Ok checked batt and amp test draw and all checks out but the problem is still there. When i first start car every morning it goes through this. Then then it clears up and all the gauges go back to normal but the trackion stays on but once i clear the TCS code then that goes away as well. Any ideas is there somewhere to look first i checked doors ok now cause my pass side had a loose connection but thats been fix.
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
The only other thing that I can think of would be a carboned up ignition switch. Once its used first start it makes better contact on the successive ignition cycles.
Give that a look:
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
Give that a look:
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
Last edited by Bill Curlee; Jul 24, 2013 at 08:05 AM.
Thread Starter
Le Mans Master
Joined: Jul 2010
Posts: 6,013
Likes: 726
The only other thing that I can think of would be a carboned up ignition switch. Once its used first start it makes better contact on the successive ignition cycles.
Give that a look:
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
Give that a look:
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
