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Help Understanding Engine Codes

Tiny
JRH02
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 19,100 MILES
My check engine light came on and I went to Autozone to have the codes printed out. These are the codes, but I need help in understanding what problem they correlate to.

B1216
B1227
B1234
B1245
P0128

I have a 2004 Impala.
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Wednesday, February 8th, 2012 AT 3:15 AM

5 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The P 0128 is usually a bad thermostat let me check into the other codes for you.
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Wednesday, February 8th, 2012 AT 3:22 AM
Tiny
CHEVYFORLIFE
  • MECHANIC
  • 33 POSTS
The p0128 code is a thermostat but the other codes don't pull up in the system as good codes. Dont know what auto zone got those ones from
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Saturday, February 11th, 2012 AT 12:28 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Codes starting with a B are body control module codes which a basic code reader like auto zone has cant read. Are you sure those codes start with a B?
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Saturday, February 11th, 2012 AT 12:37 AM
Tiny
JRH02
  • MEMBER
  • 2 POSTS
Yes, that is what the sales associate wrote down at least. Thank you for your help.
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Saturday, February 11th, 2012 AT 1:27 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
There are no body codes that match those numbers either. I suspect his scan tool was faulty.
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Saturday, February 11th, 2012 AT 2:08 AM

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