What kind of diagnostic interface does a GMC use?

GMC, Holden, Opel, Vauxhall. Most GM cars produced in 1996-2003 use J1850-VPW interface. GM cars produced in 2003-2006 use J1850-VPW interface or CAN. Most cars produced after 2006 are equipped with CAN bus. Since 2002, there is another pinout – GM-LAN (for vehicles equipped with CAN bus) Note that list is not 100% complete!

What can cause a faulty ABS control module?

Other problems with the ABS system include faults in the wiring and fuses. A faulty ABS control module can cause abnormal braking behavior, especially at low speeds. Any defect in the ABS system, including the control module, is indicated by the vehicle’s ABS warning light in the instrument panel.

How to read GM OBD diagnostic codes for free?

How to read the codes 1 Ground terminals A and B (see diagram below) with the ignition “ON” and engine not running. The system will enter the… 2 After Code 12 is displayed, any stored trouble codes will be displayed by flashing the “CHECK ENGINE”, “SERVICE… More …

Where can I Find my GM trouble code?

If you own a 1982 to 1995 GM car or truck, you just might be able to read your trouble codes for free! If you have a connector like this under your dash, read on… (note: this connector may have a black plastic cover over it, so also look for a cover shaped like this, sorry for the messy wires here)

Why do you need a jumper wire to flash a car code?

Using jumper wires to flash codes has been built in by the car manufacturers to ensure people without a Scan Tool or Code Reader can still diagnose the vehicle faults by reading the codes.

Where is the OBD II diagnostic port on a car?

All vehicles sold in the United States from 1996 and after were mandated to haven an OB II diagnostic port installed by the manufacturer. The port on the car it typically black or white. If you are having a difficult time locating the OBD II port use the OBDII port locator here.

What kind of diagnostic pinout does a GM car use?

Most GM cars produced in 1996-2003 use J1850-VPW interface. GM cars produced in 2003-2006 use J1850-VPW interface or CAN. Most cars produced after 2006 are equipped with CAN bus. Since 2002, there is another pinout – GM-LAN (for vehicles equipped with CAN bus)

When did the OBD II data link connector come out?

The DLC or Data Link Connector is an OBD II, 16 pin, standard connector used in all automobiles manufactured since 1996. In today’s vehicles, it’s in constant communication with the CAN, or Computer Area Network.

Is the diagnostic reader on my GMC truck working?

When I owned my last truck and it started idling roughly, I invested in a handheld diagnostic reader. These little machines aren’t cheap, and the problem I’m now having is pissing me off.

How many connectors does a GM 4.3L PCM have?

The 1996-97 PCM (Powertrain Control Module = Fuel Injection Computer) on your 4.3L, 5.0L or 5.7L Engine has a total of 4 connectors. NOTE: For other PCM pin-out charts, take a look at the following:

Why is my OBD scanner not working on my GMC Sunfire?

Check your fuses, I can not remember exactly which one,but I have seen multiple times that the OBD port fuse is blown. I know some smaller GM’s (cavaliers, sunfires) are run off the electric seat fuse. The yuppie speaks the truth. Don’t ask me why GM put the OBD port on that circuit……Pull the cover and swap a fuse in that spot.