Help Understanding Engine Codes

2004 CHEVROLET IMPALA
19,100 MILES
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JRH02
  • MEMBER
  • 2 POSTS
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.
Feb 7, 2012 at 7:15 PM
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SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
The P 0128 is usually a bad thermostat let me check into the other codes for you.
Feb 7, 2012 at 7:22 PM
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CHEVYFORLIFE
  • EXPERT
  • 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
Feb 10, 2012 at 4:28 PM
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SATURNTECH9
  • ✓Experienced 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?
Feb 10, 2012 at 4:37 PM
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JRH02
  • MEMBER
  • 2 POSTS
Yes, that is what the sales associate wrote down at least. Thank you for your help.
Feb 10, 2012 at 5:27 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 POSTS
There are no body codes that match those numbers either. I suspect his scan tool was faulty.
Feb 10, 2012 at 6:08 PM
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