Pull the GM Diagnostic OBD CODES .. how ?
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Super Moderator
Joined: Feb 2007
Posts: 3,945
Pull the GM Diagnostic OBD CODES .. how ?
When your Caddy has problems,
WE NEED THE CODES.
PLEASE PULL THE CODES !
GM uses OBD-1, OBD-II, OBD-III Codes
Ohh, you dont know how to do it?
Here are a couple of help threads:
this 1st one is very detailed ..
https://www.cadillacforum.com/m_11904/tm.htm
these have additional info and links
https://www.cadillacforum.com/m_12932/tm.htm
https://www.cadillacforum.com/m_15478/tm.htm
hhttps://www.cadillacforum.com/m_17425/tm.htm
Joined: Aug 2007
Posts: 6
From:
RE: Pull the GM Diagnostic OBD CODES .. how ?
how do i go about resetting my obd systems I had some old codes and trying to make sure the ones i have at the momment is new and needto know how to fix them . PO171 & PO174 both are too lean codes, PO300 ramdon misfire but it not, PO603 memory error,P1632 THEFT SYETEM FUEL, AND last is the TCC PO741stuck off
Super Moderator
Joined: Feb 2007
Posts: 1,646
RE: Pull the GM Diagnostic OBD CODES .. how ?
Disconnect the battery for a few minutes.
or try this
PRESS:
OFF & WARM (red button) together
- the D.I.C. will light up the instrument cluster like a Christmas tree
- the D.I.C. will start diagnostics, as soon as it starts displaying ..
PRESS:
LO
- until " ECM " comes up
PRESS:
HI
- until " CLEAR CODES ? " comes up
PRESS:
HI
- press only once
- response will be in a few seconds: CODES CLEARED
you are done ...
PRESS RESET and you are back to normal
or try this
PRESS:
OFF & WARM (red button) together
- the D.I.C. will light up the instrument cluster like a Christmas tree
- the D.I.C. will start diagnostics, as soon as it starts displaying ..
PRESS:
LO
- until " ECM " comes up
PRESS:
HI
- until " CLEAR CODES ? " comes up
PRESS:
HI
- press only once
- response will be in a few seconds: CODES CLEARED
you are done ...
PRESS RESET and you are back to normal
hmmmmm
Tech Certified Members
Joined: Oct 2007
Posts: 3,160
From: in the mitten
After all the codes are displayed, DIC should display "PCM". Press high blower button and you will be in the ECM/PCM module options. Press low for no and high for yes for what comes up. on 82-95 Cadillac powered models scanner is not required, diagnostics intended for use with "on-board diagnostics". 80-81 DFI or 8-6-4 are unique to themselves, still have "on board" but access and data are different. Cimmaron and 86-96 RWD Fleetwood or Brougham require scanners. EFI - no onboard, no scanner, nor codes "Symptom Charts"...FSM,DVOM, and a prayer or two.
