2005 Chevy Cavalier 2.4? Automatic Trac Light

Gail Technician Garner, North Carolina Posted   Latest   Edited  
Case Study
Braking
2005 Chevrolet Cavalier 2.2L (F L61) 4-spd (4T40-E)
P0134 - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1
C1175
Trac Light On Intermittantly

I'll attach pictures in a few minutes from phone. Codes P0134 (02 sensor) & C1175 <PCM requested ETS to be disabled>. Haven't addressed the P0134 yet as complaint was Trac Light on intermittently. Trac light is off today. Test drove watching ABS data as assumed one was dropping out. ALL the wheel speeds will drop out but not at same time. They just glitch for a second or so. Seems to be more repeatable below 30 MPH and turning. Only scanner i have available is my AutoEnginuity. Found the battery voltage, both switched and "ignition" to ABS drop out to zero, but not exactly together. I haven't had time to do any visual inspection except looking through the wheels at nearly worn out front brake pads. Do these have ignition switch issues? No other symptoms I've noticed. Owner is 85, my landlord, so her info can be a little sketchy.

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

I would first fix what you know is broken. Many times, things like traction control, cruise control and remote start functions are disabled when the CEL is commanded on.

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Gail Technician
Garner, North Carolina
Gail Default
 

MIL light is NOT on. Only TRAC Light.

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Randy Diagnostician
Glendora, California
Randy Default
 

Clear codes pending and other and recheck

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Randy Diagnostician
Glendora, California
Randy Default
 

i agree with Albin

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Gail Technician
Garner, North Carolina
Gail Default
 

I was working in the dark. I'll verify the 02 operation first tomorrow. But the voltage dropping to zero in the ABS module indicates a problem to me.

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Randy Diagnostician
Glendora, California
Randy Default
 

Do not trust scan data .

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Ray Diagnostician
North York, Ontario
Ray Default
 

Albin is right, first fix the p0134

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Michael Manager
Marysville, Washington
Michael Default
 

An O2 sensor code will do nothing to the ABS, however on this car I have seen bad throttle bodies cause this issue. When the throttle body mess's up it sends a signal to the abs and traction control limiting power. I would first recommend using a better scan tool than the autoenginuity. I demo'd that for a while and had nothing but problems and it would not gather data fast enough to see glitches.

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Randy Diagnostician
Glendora, California
Randy Default
 

I have seen a code set or pending in ecm create all kinds of problems in abs or traction control modules . Trouble shot the code that you have first .

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Gail Technician
Garner, North Carolina
Gail Default
 

Tech tip from Identifix: The Trac Off light is on because the PCM cannot assist the Electronic Brake Traction Control Module (EBTCM) in a Traction Control Event because of the (P0134) DTC. It says diag the p0134 first. Just like the rest of you...I'll go stand in the corner.

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Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
 

Hi Gail: I can't say that I disagree with Albin but I'd be curious what happens to your Engine Run Time when the battery voltage drop outs occur. Also, what do you mean by battery voltage - switched vs. ignition? HTH, Guido

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Gail Technician
Garner, North Carolina
Gail Default
   

It show 2 battery voltage PIDS. One is "ignition" other is "switched". I'm assuming the ignition one is hot at all times. I'll look at the wiring diagram. Picture # 5 shows the description. But i don't really trust the AE software. It's pretty good on Powerstrokes. haven't used it much on anything else.

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Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
 

Hi Gail: I think that you picked up on where I was going with that. Obviously, B+ isn't switched. For you to show a loss of power at both circuits at the same time would require: a lack of integrity going to the fuse box, a lack of integrity at two separate circuits at (or after) the fuse box, or your scan tool is of dubious accuracy. Guido

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Michael Manager
Marysville, Washington
Michael Default
 

As I agree that the PCM can shut down ABS system, a slow switching O2 sensor as show from your DTC picture will not cause that. Yes the O2 sensor is probably old and needs replace but I'm quite sure you'll still have the same problem with the ABS. About the only thing I have ever seen cause a PCM to deactivate an ABS system is a throttle body. I would be looking hard at your TPS sensor readings…

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David Technician
La Mesa, California
David Default
 

I would check p0134 and alternator with better scaner/ scope

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Gail Technician
Garner, North Carolina
Gail Default
   

C1275 is a hard code. Can't clear it. I'll try a global reset but am fairly certain that's not gonna help. My gut says I have an issue with ABS module.

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Robert Diagnostician
Oldsmar, Florida
Robert Default
   

I'm in agreement with the majority here that the P1134 needs to be addressed first as well. I too have used the Autoenginuity scan software in the past and would see ABS speed sensors drop out randomly ( Usually all of them during a long road test ) i learned to ignore them unless i was looking for issues in that area. The voltage issue you see , if repeatable, you can easily graph both values…

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Gail Technician
Garner, North Carolina
Gail Default
 

Awesome reply. Not sure how many watched my horrible video but the car currently has no driveability issue. No warning lights on. Even when driven and voltage to ABS drops, no warning light. After much research realize this is this generation of cars "stabilitrac" light which is a secondary indicator. Those were/are frequently throttle body/wiring related. This car has old school cable operated…

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Gail Technician
Garner, North Carolina
Gail Default
 

And to be clear, no longer at PEPBOYS.

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Gail Technician
Garner, North Carolina
Gail Default
 

Top sensor is one I installed several months ago. It definitely seemed to 'flatten out" at idle even though heater circuit was showing amp draw (.65ish). The new sensor, bottom, pulled slightly less amps (.45ish) but stayed active at idle. She says TRAC light would only come on at start up but would then occasionally go off while driving. So PCM is commanding light @ start up, then at some…

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Gail Technician
Garner, North Carolina
Gail Default
 

Seems the O2 fixed it. I'll try to get a graph of the new sensor tomorrow.

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