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Discussion Starter · #1 ·
I got a PCM Code today. HC0420. Here is what I found on the code list.

P0420 TWC System Low Efficiency Bank 1-A

I just had a H/C package installed and wondered if anyone can tell me what this one means? Of course, I will call the shop next week.

Thanks!
 

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RalphP said:
I got a PCM Code today. HC0420. Here is what I found on the code list.

P0420 TWC System Low Efficiency Bank 1-A

I just had a H/C package installed and wondered if anyone can tell me what this one means? Of course, I will call the shop next week.

Thanks!
Ralph,
I just left you a message on your cell phone.
Jim
 
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