P0031 troubles

[MattMaster1]

I have a2004 jeep tj 2.4 ha e a reconditioned pcm, new ngk 02 sensors new catalic converters on a cold start get a p0031 can clear code restart may run all day no check engine light next morning same scenario, been to 2 different shops they can't seem to figure it out any ideas would be greatly appreciated, thanks Matt

 

[macleanflood]

Where did you source the PCM?

@Wranglerfix

-Mac

 

[Wranglerfix]

I have a2004 jeep tj 2.4 ha e a reconditioned pcm, new ngk 02 sensors new catalic converters on a cold start get a p0031 can clear code restart may run all day no check engine light next morning same scenario, been to 2 different shops they can't seem to figure it out any ideas would be greatly appreciated, thanks Matt

We can repair that code if it is in the pcm.

 

[MattMaster1]

Where did you source the PCM?

@Wranglerfix

-Mac

wrangler fix out of flordia a refurbished pcm just recently started getting this code I have changed 02 sensor with factory ones from local jeep dealer but e ery cold start up get the same code just cleared the code started off shifter to 2nd gear check engine light came back on scanned it was p0031 again

 

[MattMaster1]

could this be a bad ground wire somewhere ?

 

[macleanflood]

I know I went through three O2 sensors...my original Mopar, a Walker, and a new NGK...none of them threw codes on my 97 but the voltages were out of range. I checked all the wiring and on a whim threw a used NGK one in from a 2000 I'm parting out and it's been perfect.

Almost all new parts are crap these days.

-Mac

 

[Wranglerfix]

You can send that computer back into us and we can test it for you if it is the Ecm we will get it repaired and back on its way to you.

 

[Wranglerfix]

Thank you for providing details about the issue you're experiencing. We tested your PCM in our vehicle and were unable to replicate the condition or fault code you reported. This suggests the issue may be related to the vehicle itself.

Since you've already taken appropriate steps—replacing relevant parts with known good ones and thoroughly inspecting the wiring—we will, out of an abundance of caution, send you a replacement WranglerFix PCM. If the issue persists after installing the new PCM, we can confirm the PCM is not the cause. Please allow a few drive cycles and try to replicate the conditions that triggered the intermittent issue.

We’re here to support you. Please don’t hesitate to reach out with any questions or updates.

Best regards,

Mark

 

[macleanflood]

Wiring diagrams are in the resources section.

I'd ohm and continuity check the wires to the O2 sensor and possibly try an overlay...run temporary wires... for testing.

Live ODB data helps too...you can do that with something as simple as a Bluetooth ODB dongle and the free Torque Lite app.

-Mac

 

[tr21triton]

Thank you for providing details about the issue you're experiencing. We tested your PCM in our vehicle and were unable to replicate the condition or fault code you reported. This suggests the issue may be related to the vehicle itself.

Since you've already taken appropriate steps—replacing relevant parts with known good ones and thoroughly inspecting the wiring—we will, out of an abundance of caution, send you a replacement WranglerFix PCM. If the issue persists after installing the new PCM, we can confirm the PCM is not the cause. Please allow a few drive cycles and try to replicate the conditions that triggered the intermittent issue.

We’re here to support you. Please don’t hesitate to reach out with any questions or updates.

Best regards,

Mark

Just more proof Mark and @Wranglerfix are a top notch company and go above and beyond to help out.