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

 

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

 

forget to tell you the year is 1996 deville

 

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

 

Do older Cadillacs (1968's) have codes?

 

do you clear the codes on a 95 sls the same way?

 

no ...


yes ...


.

 

thank you.

 

i tried to clear my codes i never found the ecm to clear it now what do i need to do?
thank you

 

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.