P0301 code trac off light

Tiny
JFIGUEROA2600
  • MEMBER
  • 2000 CHEVROLET CAVALIER
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 148,370 MILES
Hi, I have the car listed above (z24) and I recently did a fuel pump and filter the other day it gained a misfire and it ended up becoming a dead misfire in cylinder one. I checked the coil pack there all getting spark. I put new plugs plug boots. I checked over the work I did in the back with the fuel pump and every thing is fine, but it still misfires in cylinder one and the trac off light comes on before the check engine light does when I clear the code. Any ideas?
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Saturday, February 16th, 2019 AT 10:25 AM

17 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

Did you check the compression in number one cylinder?

https://www.2carpros.com/articles/how-to-test-engine-compression

The trac light is controlled by the ABS module.

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

Did you have any other codes? If not, then the reader may not be able to read ABS codes.

I need that code to further help.

Roy
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Saturday, February 16th, 2019 AT 1:51 PM
Tiny
JFIGUEROA2600
  • MEMBER
I haven't checked compression yet. But we pulled the injectors and tested them and they're all fine. It's getting fuel and everything but the only code I am getting is cylinder one misfire. When I was driving it the rest of the way home the traction off light and the check engine light was flashing obviously due to severe misfire. I was wondering why the trac off light would be flashing? But there was no ABS light only those two then when I cleared the code it still had a mis but only the trac off light came on.
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Sunday, February 17th, 2019 AT 11:23 AM
Tiny
ASEMASTER6371
  • EXPERT
The misfire needs to be addressed. Clearing it does nothing as diagnostics need to be done and repairs.

As I stated before, you need to check the compression.

As far as the trac light, you need to check the code in the ABS system. There is a fault code stored.

Roy
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Sunday, February 17th, 2019 AT 1:18 PM
Tiny
JFIGUEROA2600
  • MEMBER
I know clearing the code wont do anything and I am about to do a compression check. I got a p0108 code for MAP sensor high input. I looked and the line was dry rotted and ripped and barely was on the sensor. Could that also be a cause?
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Sunday, February 17th, 2019 AT 1:21 PM
Tiny
ASEMASTER6371
  • EXPERT
Yes, for that code.

It is not for the misfire.

Roy
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Sunday, February 17th, 2019 AT 2:00 PM
Tiny
JFIGUEROA2600
  • MEMBER
Did compression check made between 180psi and 210psi. All cylinders are getting fuel. No spark in cylinder one. Changed coil pack, still nothing. Changed ignition module, still nothing.
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Tuesday, February 19th, 2019 AT 1:40 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, when I have this issue, I replace the cap, the coils and the module on top.

Electric leaks through the cap to ground and that overloads the module and the coil.

Roy
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Tuesday, February 19th, 2019 AT 1:45 PM
Tiny
JFIGUEROA2600
  • MEMBER
I figured out the issue. Bought a code reader, read through ABS system said PCM malfunction class 2 and lost communication to PCM. I think maybe the PCM got wet because we recently had snow. So I am going to take it out and put Dielectric grease in the connectors and dry the area and clean the grounds. If that doesn't work I most likely need another one either way.
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Friday, February 22nd, 2019 AT 8:36 PM
Tiny
JFIGUEROA2600
  • MEMBER
There was 6 codes total related to the PCM.
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Friday, February 22nd, 2019 AT 8:36 PM
Tiny
ASEMASTER6371
  • EXPERT
What were those codes? You never listed them in your post?

Roy
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Saturday, February 23rd, 2019 AT 4:35 AM
Tiny
JFIGUEROA2600
  • MEMBER
I cleared the codes and checked again. Code C1275 PCM serial data malfunction is the one that comes up.
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Saturday, February 23rd, 2019 AT 7:57 AM
Tiny
ASEMASTER6371
  • EXPERT
Thats not for the PCM. It is for the serial data line that talks to all the modules.

You should never have erased the codes. Thats does nothing and now we not information to diagnose.

Below is a description and attached is the wiring diagram and tests.

Roy

Circuit Description
The PCM monitors various parameters and will not allow ETS operation if any parameter falls outside a specified range.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
A malfunction has been detected by the PCM which would inhibit ETS operation.

Action Taken When the DTC Sets
The EBCM disables the ETS for the duration of the ignition cycle.
The TRAC OFF indicator turns ON.
The ABS will remain functional.

Conditions for Clearing the DTC
The condition for setting the DTC is no longer present and the scan tool Clear DTCs function is used.
The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
If an intermittent malfunction exists, refer to Testing for Intermittent and Poor Connections see Diagnostic Aids under Diagrams.
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Saturday, February 23rd, 2019 AT 8:06 AM
Tiny
JFIGUEROA2600
  • MEMBER
I know understand it will not fix it. I did it to see what codes would come back and I took pictures of all of the codes before I did.
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Saturday, February 23rd, 2019 AT 8:57 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, good. Post the codes on this post so we can continue.

Roy
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Saturday, February 23rd, 2019 AT 9:02 AM
Tiny
JFIGUEROA2600
  • MEMBER
I am trying to but for some reason it is not letting me. Is there any other way I can reach you to send them out?
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Saturday, February 23rd, 2019 AT 9:31 AM
Tiny
JFIGUEROA2600
  • MEMBER
I was able to get two out that is it.
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Saturday, February 23rd, 2019 AT 9:33 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, The u1000 is below.

Roy

CIRCUIT DESCRIPTION
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the ID number of the module which sent the message for State of Health monitoring (Node Alive messages). A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an ID number with at least one critical parameter within about five seconds of beginning serial data communication, DTC U1OOO is set. When more than one critical parameter does not have an ID number associated with it, the DTC will only be reported once.

CONDITIONS FOR RUNNING THE DTC
The vehicle power mode (ignition switch position) requires serial data communication to occur.

CONDITIONS FOR SETTING THE DTC
At least one critical operating parameter has not been associated with an ID number within about five seconds after beginning serial data communication.

ACTION TAKEN WHEN THE DTC SETS
The SERVICE VEHICLE SOON indicators illuminates.
The module uses a default value for the missing parameter.

CONDITIONS FOR CLEARING THE DTC
A current U1OOO will clear when all critical operating parameters for the module have been associated with an ID number, or at the end of the current ignition cycle.
A history U1000 will clear upon receipt of a scan tool CLEAR DTCs command.

DIAGNOSTIC AIDS
When a malfunction (such as a blown fuse to a module) occurs while modules are communicating, a Loss of XXX Communication DTC is set as current. When the modules stop communicating (ignition is turned off) the current Loss of XXX Communication DTC is cleared but the history DTC remains. When the modules begin to communicate again, the module with the blown fuse will not be learned by the other modules so U1OOO is set current by the other modules. If the malfunction occurs when the modules are not communicating, only U1000 is set.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
1. A Loss of XXX Communication DTC with a history status may indicate the cause of U1000.
2. The module(s) which is not communicating is the likely cause of U1000.
7. The module which was not communicating due to a poor connection to the class 2 serial data circuit may have set Loss of XXX Communication DTCs for those modules that it was monitoring.
9. The modules which can communicate indicate the module which can not communicate. You must clear the DTC from these modules to avoid further misdiagnosis.
11. If all modules are communicating, the module which set U1OOO may have done so due to some other condition.
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Saturday, February 23rd, 2019 AT 11:24 AM

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