P1571 Traction Control PWM Link

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Aug 30, 2010 | 10:56 PM

#21

jhiiidoc

Thread Starter

Racer

Joined: Jan 2005

Posts: 311

Likes: 1

From: Arkansas

OK...back in business.

Checked all the fuses in the underhood fuse box.

All related to PCM registered voltage. Only those related to horn/lights/etc had no voltage.

Which (specifically) fuses am I checking (fuse numbers)?

You showed the EBCM...am I supposed to pull the connector and check voltage there?

Aug 30, 2010 | 11:28 PM

#22

lucky131969

Tech Contributor

Joined: Jan 2007

Posts: 19,475

Likes: 1,171

From: Dyer, IN

Quote:

Originally Posted by jhiiidoc

Based on the codes you reported, my money is on the ignition switch. I would inspect it before going any further. The no radio comm is the dead giveaway, coupled with a P1571 code.

Sep 4, 2010 | 10:28 PM

#23

jhiiidoc

Thread Starter

Racer

Joined: Jan 2005

Posts: 311

Likes: 1

From: Arkansas

Quote:

Originally Posted by lucky131969

Based on the codes you reported, my money is on the ignition switch. I would inspect it before going any further. The no radio comm is the dead giveaway, coupled with a P1571 code.

Pulled the ignition switch apart...did not notice anything out of the ordinary and the ignition functions as it is supposed to.

Now what???

Sep 4, 2010 | 10:31 PM

#24

lucky131969

Tech Contributor

Joined: Jan 2007

Posts: 19,475

Likes: 1,171

From: Dyer, IN

Quote:

Originally Posted by jhiiidoc

Pulled the ignition switch apart...did not notice anything out of the ordinary and the ignition functions as it is supposed to.

Now what???

So all the electrical contacts were pristine? No build up?

Sep 4, 2010 | 10:35 PM

#25

jhiiidoc

Thread Starter

Racer

Joined: Jan 2005

Posts: 311

Likes: 1

From: Arkansas

Quote:

Originally Posted by lucky131969

So all the electrical contacts were pristine? No build up?

Factory clean. No corrosion...

Sep 4, 2010 | 11:22 PM

#26

lucky131969

Tech Contributor

Joined: Jan 2007

Posts: 19,475

Likes: 1,171

From: Dyer, IN

Quote:

Originally Posted by jhiiidoc

Factory clean. No corrosion...

Not to belabor the point, but I've never seen the internal contacts on an ignition switch look factory new, even in some low mile cars.

Just so we are talking about the same thing. You actually disassembled the ignition switch(in a manner like Bill's repair thread)?

Nov 15, 2010 | 06:24 PM

#27

seoulbrooks

Instructor

Joined: Oct 2010

Posts: 240

Likes: 2

From: Yangpyeong Gyeonggi-Do

Here is the reason he is getting Radio NO COMM because of

No comms on Radio...is that because I replaced the head unit with an aftermarket stereo?

YES....

I suspect you should continue to follow Bill's line of troubleshooting.

Jan 4, 2011 | 09:30 PM

#28

gman31

Instructor

Joined: Dec 2007

Posts: 197

Likes: 0

From: Gretna Louisiana

Quote:

Originally Posted by jhiiidoc

Removed both battery terminals, checked and cleaned
Checked Voltage before reinstall: 12.3 V
Reconnected Battery to specifications..same messages in DIC return.

Tried to reset TCS....continues to read NO COMMS

Same three codes continue to set after reset.

PCM P1571 H C
TCS NO COMMS
RTD C0710 H C
SDM U1040 H C
RADIO NO COMMS

Did you ever solve the problem with these codes? I'm throwing these codes after battery died and recharged it. Reset DIC and codes keep coming back.

Update please.

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Jan 4, 2011 | 09:46 PM

#29

Bill Curlee

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

For a module to have NO COMMS, it has to have one or more of the following issues:

NO 12 VDC "hot at all times power"
NO 12 VDC "hot in run and start power"
Damaged comms wire
Damaged ground

Check the fuses for the EBTCM.

Check the grounds for that module.

Check the serial buss data line and the STAR Buss connectors:

Last edited by Bill Curlee; Jan 4, 2011 at 09:50 PM.

Oct 3, 2012 | 04:19 PM

#30

m88vet

Instructor

Joined: May 2008

Posts: 218

Likes: 0

From: LA from the 6th sept till the 10th sept california ( then New Zealand)

is your problem resolved?? can you tell me what was wrong?? i have the same TCS NO COMMS ....... !! help

Feb 1, 2020 | 02:45 PM

#31

helphos

Burning Brakes

Joined: Nov 2009

Posts: 828

Likes: 103

From: Olney MD

P1571 along with TCS No COMM

I'm having this problem, and this 9 year old thread is being helpful AF.
Thanks to Bill Curlee for the great diagnostic advice. (Would be nice if the OP would have chimed in with their solution, though).

I'm off to check grounds.