What is the Difference Between H and HC Codes?
Thread Starter
Le Mans Master
Joined: Oct 2004
Posts: 5,841
Likes: 19
From: CLT, North Carolina
What is the Difference Between H and HC Codes?
Need some descriptions I guess. Would someone please explain the various prefix and suffix letters usually found attached to the diagnostic codes?
Another question in particular... what is the difference between an "H" and an "HC" suffix found at the end of some codes?
Also... does the code prefix letter denote the module the code is for?
Thanks in advance! Greg
Another question in particular... what is the difference between an "H" and an "HC" suffix found at the end of some codes?
Also... does the code prefix letter denote the module the code is for?
Thanks in advance! Greg
Burning Brakes
Joined: Sep 2007
Posts: 860
Likes: 3
H= a problem that is not present when you look at the codes - a history code, C= a problem this is still present when you pull the codes - a current problem, HC = a problem that has occured in the past and is still a problem
Tech Contributor
Joined: Oct 1999
Posts: 41,013
Likes: 9,775
From: Charlotte, NC (formerly Endicott, NY)
The code prefix letters are some what related to the subsystem not a module. For example P is usually related to Powertrain items but C can stand for ABS or TPM items. The H stands for history and the C stands for current. Having both an H and a C indicates the code is current and has occurred previously.
The code does not tell you what module to replace. It is only an indication that something isn't correct. For example you could get a wheel speed sensor code due to a bad sensor, a bad connector, a broken wire, a shorted wire, corrosion on a contact, etc. Each code has a diagnostic procedure that guides a person in narrowing down the cause of the code.
When mechanics use a Tech II to look at the codes they see the same codes as shown on the DIC and sometimes some additional codes that assist in troubleshooting.
Bill
The code does not tell you what module to replace. It is only an indication that something isn't correct. For example you could get a wheel speed sensor code due to a bad sensor, a bad connector, a broken wire, a shorted wire, corrosion on a contact, etc. Each code has a diagnostic procedure that guides a person in narrowing down the cause of the code.
When mechanics use a Tech II to look at the codes they see the same codes as shown on the DIC and sometimes some additional codes that assist in troubleshooting.
Bill
