Heater codes (P0032, P0038, P0052, P0058) on my 2005 TJ

[TheManWithNoName]

Hey everyone,


I am looking for some input before I pull the trigger on a PCM. I have a 2005 Jeep TJ 4.0 that recently threw these four codes all at once:


P0032 O2 Sensor Heater Circuit High Bank 1 Sensor 1
P0038 O2 Sensor Heater Circuit High Bank 1 Sensor 2
P0052 O2 Sensor Heater Circuit High Bank 2 Sensor 1
P0058 O2 Sensor Heater Circuit High Bank 2 Sensor 2


The Jeep has been running a bit rough at idle for a while and sometimes when I come to a stop the RPMs dip and then bounce back up. I replaced Bank 1 Sensor 1 a while ago so I do not think it is just a bad sensor. Given how common PCM failures are on 2005 TJs especially with the O2 heater drivers I am starting to think the PCM might be bad. Has anyone seen all four heater circuit high codes appear at once and it was not the PCM? Any other checks I should do before making the drive or swapping the computer?

Thanks,

 

[Chris]

Hey everyone,


I am looking for some input before I pull the trigger on a PCM. I have a 2005 Jeep TJ 4.0 that recently threw these four codes all at once:


P0032 O2 Sensor Heater Circuit High Bank 1 Sensor 1
P0038 O2 Sensor Heater Circuit High Bank 1 Sensor 2
P0052 O2 Sensor Heater Circuit High Bank 2 Sensor 1
P0058 O2 Sensor Heater Circuit High Bank 2 Sensor 2


The Jeep has been running a bit rough at idle for a while and sometimes when I come to a stop the RPMs dip and then bounce back up. I replaced Bank 1 Sensor 1 a while ago so I do not think it is just a bad sensor. Given how common PCM failures are on 2005 TJs especially with the O2 heater drivers I am starting to think the PCM might be bad. Has anyone seen all four heater circuit high codes appear at once and it was not the PCM? Any other checks I should do before making the drive or swapping the computer?

Thanks,

It's definitely not uncommon for the PCM to develop issues, particularly in the 2005 models, but there are a few things you might want to check before committing to a new PCM.

• Start by inspecting the wiring and connectors for all your O2 sensors. Look for any signs of wear, corrosion, or damage. A short or poor connection in the wiring could easily cause the heater circuit faults you're seeing.
• Check the relevant fuses and relays involved in the O2 sensor heater circuits. Sometimes a blown fuse can cause multiple codes, so it’s worth ruling that out.
• Make sure that the ground connections for the O2 sensors are solid. A bad ground can lead to erroneous behavior and throw codes.
• If you have the tools available, consider checking the voltage at the O2 sensor heater circuits. The sensors need to be receiving the correct voltage for the heater circuits to function properly.
• Just to clarify, have the Bank 2 sensors been checked or replaced? Since you replaced Bank 1 Sensor 1, that one’s out of the question, but if Bank 2’s sensors are original, they might be contributing to the issue.

If after all that, you still have the same codes then leaning towards a PCM replacement might be the next logical step.

If you do get a new PCM you'd be very wise to go with wranglerfix.com. @Wranglerfix is a highly reputable member around here.

 

[TheManWithNoName]

Hi guys, just an update! I drove to Davie and met with Mark from @Wranglerfix . The issue was indeed the OEM PCM. Got a new one from Mark and the car is running better than before! I'm very happy! Definitely recommend @Wranglerfix