Gm obd1 pinout

Gm obd1 pinout DEFAULT

Should be suitable for most modern GM cars - Buick, Cadillac, Chevrolet, Daewoo
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.


1  Second UART
2J1850 J1850(+) VPW
3  Comfort
4GND Chassis ground
5SGND Signal Ground
7K-Line n/c
8  CCM
9 first UART
10 PWMn/c
11 EVA controller
12 ABS
13 SIR
14 HS-CAN(-) E&C
15L-Line n/c
16 Battery+Battery +, unswitched

 Since 2002, there is another pinout - GM-LAN (for vehicles equipped with CAN bus)

1 SW-LS-CAN (33kB) or DW-FT-CAN (+) (<125kB)
3 MS-CAN (+) (95kB)
4GND Chassis ground
5SGND Signal Ground
6HS-CANISO 15765 HS-CAN (+) (500kB)
8 n/a
9 DW-FT-CAN (-) (<125kB)
10 PWMn/c
11 MS-CAN (-) (95kB)
12 K-Line (KW82 Prot.)
13 reserved
14 HS-CAN(-)ISO 15765 HS-CAN (-) (500kB)
15L-Line n/a
16 Battery+Battery +, unswitched



OBD-2 compatibility list

Note that list is not 100% complete!

ModelEngineYear (starting from)OBD-2 Protocol
Buick Century 2002VPW J1850 
Buick Rivera 1998VPW J1850 
Buick Skylark 1996VPW J1850 
Cadillac Deville 2000VPW J1850 
Cadillac Eldorado 1998VPW J1850 
GMC Jimmy 1999VPW J1850 
GMC K2500 1997VPW J1850 
GMC Lumina 2001VPW J1850 
GMC Yukon 1998VPW J1850 
Chevrolet Astra 2.0 Flex Power, Gasoline (127 HP)2004ISO 14230-4, ISO 9141-2
Chevrolet Aveo1.4, Gasoline (60HP)2005KWP FAST
1.6, Gasoline (103HP)2005KWP FAST
1.6, Gasoline (103HP)2007KWP FAST
1.2, Gasoline (70HP)2008KWP FAST
1.5, Gasoline (?HP)2008KWP FAST
Gasoline (84 HP)2009ISO 14230-4 
1.2, Gasoline or LPG (82HP)2009KWP FAST
Chevrolet Blazer 1995VPW J1850 
Chevrolet Blazer LTGasoline (191 HP)1997VPW J1850 
Chevrolet Camaro 1997VPW J1850 
 1997ISO 14230-4, ISO 9141-2
 1998VPW J1850 
3.8 V6, Gasoline (193HP)1998VPN
 1999VPW J1850 
5.7 LS1, Gasoline (288HP)1999VPN
 2000VPW J1850 
L36, Gasoline (191 HP)2002VPW J1850 
6.2 V8, Gasoline (405HP)2012CAN 11bit (500kb)
Chevrolet Caprice 1996VPW J1850 
Chevrolet Captiva2.0 VCDI, Diesel (150HP)2006CAN 11bit (500kb)
2.2 VCDI, Diesel (163HP)2011CAN 11bit (500kb)
Chevrolet Cavalier 1996VPW J1850 
 1998VPW J1850 
 1999VPW J1850 
Chevrolet CobaltGasoline (145 HP)2006CAN 
Chevrolet Corvette 2000VPW J1850 
V8, Gasoline (400HP)2007CAN 11bit (500kb)
Chevrolet Corvette C55.7 V8, Gasoline (350HP)2003VPN
Chevrolet Corvette C66, Gasoline (404HP)2005ISO 9141
LS7, Gasoline (512HP)2007CAN 11bit (500kb)
6.2, Gasoline (436HP)2008CAN 11bit (500kb)
Chevrolet Cruze2.0 VCDi, Diesel (150HP)2010CAN 11bit (500kb)
2.0 VCDI, Diesel (163HP)2011CAN 11bit (500kb)
Chevrolet Epica2.5, Gasoline (155HP)2004KWP FAST
2.0 vdCi, Diesel (150HP)2007CAN 11bit (500kb)
Chevrolet EvandaGasoline (176 HP)2005 
Chevrolet Express vanV8 5.3L, Gasoline (300HP)2003VPN
Chevrolet HHRGasoline (168 HP)2008 
Chevrolet Impala 2000VPW J1850 
 2002VPW J1850 
Chevrolet Kalos1.4 SE, Gasoline (93 HP)2005ISO 14230-4, ISO 9141-2
1.4 16V, Gasoline (93 HP)2006ISO 14230-4 
Chevrolet Lumina 1996VPW J1850 
Chevrolet Malibu 1997 
Chevrolet Malibu3.1 V6, Gasoline (150HP)2000VPN
Chevrolet Matiz1.0 SE LPG.i, Gasoline (64HP)2006KWP FAST
Gasoline (66 HP)2007ISO 14230-4, ISO 9141-2
0.8, Gasoline (65HP)2009KWP FAST
Chevrolet Nuriba1.8 BVA, Gasoline or LPG (122HP)2006KWP FAST
Chevrolet Optra1.6, Gasoline (109HP)2005KWP FAST
Chevrolet Orlando1.8, Gasoline (146HP)2012CAN 11bit (500kb)
2.0 HDi, Diesel (163HP)2012CAN 11bit (500kb)
Chevrolet Rezzo1.6 16v, Gasoline or LPG (107HP)2005ISO 9141
Chevrolet S10 2000VPW J1850 
Chevrolet Silverado 2002VPW J1850 
6.5, Diesel (194HP)1996VPN
Chevrolet SparkGasoline (81 HP)2008 
1, Gasoline (68HP)2011KWP FAST
Chevrolet Tahoe 1996VPW J1850 
5.7, Gasoline (265HP)1998VPN
5.3, Gasoline (275HP)2001VPN
5.3 V8, Gasoline (290HP)2005VPN
Chevrolet TrailblazerGasoline (270 HP)2002PWM J1850 
Gasoline (270 HP)2002 
Chevrolet Trans SportGasoline (184 HP)2000 
Gasoline (186 HP)2003 
Chevrolet TranssportGasoline (184 HP)1997VPW J1850 
Chevrolet Uplander3.9, Gasoline (200HP)2007CAN 11bit (500kb)
3.9, Gasoline (250HP)2007CAN 11bit (500kb)
Chevrolet Venture 1998VPW J1850 
3.4, Gasoline (160HP)2002VPN


Some OBD-II cables schemes:



The ALDU1 is a datalogger designed to work with OBD I GM vehicles.

The ALDU1 is compatible with the CABL1 and the CABL2, which are interface cables that connect to GM OBD I and OBD II vehicle respectively.

The ALDU1 can be purchased by itself, or as a combo with either the CABL1 or CABL2.

CABL1 is used for ~88-94 GM OBD1 vehicles with a rectangular ALDL connector like this:

female ALDL connector

CABL2 is used only on 95 (and some late-year 94) vehicles that still speak ALDL but have the D shaped “OBD2-style” connector like this:

Female OBD2 port

It can be interfaced with many pieces of software, including TunerPro.

In the event you need to build a custom cable, use the following pin outs for the RJ45 connector:




This is the 86-94 original ALDL connector:

ALDL 12pin 86-94


  • pin A is connected to RJ45 pin 1
  • pin B is connected to RJ45 pin 2
  • pin E and pin M are connected to RJ45 pin 3
  • pin G is connected to RJ45 pin 4
  • other pins are not connected

This is the late model ALDL connector used in 1995:

ALDL 16pin 95


  • Pins 4 and 5 are connected to RJ45 pin 1
  • Pin 13 is connected to RJ45 pin 2
  • Pin 9 is connected to RJ45 pin 3
  • Pin 16 is connected to RJ45 pin 4
  • Pin 2 is connected to RJ45 pin 5
  • Pin 10 is connected to RJ45 pin 6
  • Pin 14 is connected to RJ45 pin 7
  • Pin 6 is connected to RJ45 pin 8

Take a look at the OBD1 GM section of our online store here

The first step towards determining if your ALDU1 is working correctly is to look at the USB side.  Before you continue, you should have verified USB connectivity and you will need to know which COM port your cable is using.  Take a look at the USB troubleshooting guide if you have any questions or concerns here.

You will need to have TunerPro RT version 5.0 or later installed.

Test procedure:

  1. Start TunerPro RT with your cable plugged into your computer but unplugged from the vehicle.
  2. Load a valid XDF / ADS-ADX combination for your vehicle
  3. Go to Tools … Preferences and select “Use Plug-in” for Interface type.  Then make sure “TunerPro Data Acquisition I/O Interface” is selected.  Next, select “Configure Plug-in Component”  Then make sure “Standard Serial” is selected and the COM port shown matches the COM port of your cable. 
  4. Finally, click the “Test For Valid Interface Using Settings” to perform a test on the cable.

If your cable fails the above test, it will almost certainly need to come back to us for repair.  If it passes the above test, the hardware has passed a basic minimal test.

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Do you have a GM vehicle between 1980 to 1995? If so, there is a big chance your car has an OBD1 connector (ALDL).

This connector is unique and applies to Pontiac, Chevrolet, GMC, Oldsmobile, Cadillac, and Buick, and more. The positive thing with the OBD1 connector is you can read your trouble codes at home without any diagnostic tools.

There are special diagnostics tools for this kind of connector, but they are not necessary as you can read them just as well without a tool.

If you have a newer car after 1996, you have OBD2 codes in your vehicle and this article will not apply to your car. You can check our other article with OBD2 codes.

OBD1 Trouble Code List

Here is a complete OBD1 trouble code list. The OBD1 codes’ meanings can differ a bit depending on what car model you have, but most of them are the same among all car manufacturers. We do not take responsibility for any faults in this code list. Check your repair manual for the trouble codes of your car model.

12System OK ( Diagnosis mode active )
13Oxygen O2 Sensor – Circuit open/no activity
14Coolant Temperature sensor – Resistance too high or shorted circuit
15Coolant Temperature Sensor – Circuit low or open
16Direct ignition system (DIS) – Faulty circuit / shorted circuit
17Camshaft Position Sensor – Circuit/timing error
18Camshaft or Crankshaft – Sensor/circuit/timing error
19Crankshaft sensor – Sensor/circuit/timing error
21Throttle position sensor – Out of range/Performance
22Throttle position sensor – Low Voltage
23Intake Air temp sensor – Out of range, low resistance
24Vehicle speed sensor – Circuit fault
25Intake Air temp sensor – Out of range, high resistance
26QDM A ( Quad-driver module ) – Circuit #1 fault
27QDM A ( Quad-driver module ) – 2nd gear circuit
28QDM A ( Quad-driver module ) – Circuit #2 fault
29QDM A ( Quad driver module ) – 4th gear circuit
31Wastegate solenoid – Circuit fault
32EGR ( Exhaust Gas Recirculation ) – Circuit fault
33Manifold Air Pressure Sensor – Signal out of range, high resistance
34Manifold Air Pressure Sensor – Signal out of range, low resistance
35Idle air control valve / Sensor – Circuit fault
36Ignition system – Circuit error/fault
38Brake input ( Brake switch sensor ) – Circuit fault
39Clutch input ( Clutch sensor ) – Circuit fault
41Camshaft sensor – Circuit fault or ignition control – circuit fault/error  (depending on the car model)
42EST (Electronic spark timing) – Circuit grounded/shorted
43Knock sensor / Electronic spark control – Circuit fault error  (depending on the car model)
44Oxygen O2 sensor – Lean Mixture
45Oxygen O 2sensor – Rich Mixture
46Pass-key II – Circuit or Power steering pressure switch – circuit fault error  (depending on the car model)
47PCM data – Circuit error
48Misfire (diagnosis)
51Calibration error – Mem-cal, ECM, or EPROM failure
52Engine oil temperature circuit – Low temperature indicated / circuit error
53Battery voltage – Low/high/error or Egr valve solenoid 1 – circuit error  (depending on the car model )
54Fuel Pump – Circuit error or Egr valve solenoid 2 – Circuit error (depending on the car model )
55ECM PCM – Circuit error or EGR valve solenoid 3 – Circuit error (depending on the car model )
56Quad-driver module (QDM B) – Circuit error
57Boost control – Error / Faulty
58Vehicle anti-theft system ( VATS ) – Circuit faulty
61AC (Air conditioning) system performance or degraded oxygen sensor signal (depending on the car model)
62Engine oil temperature sensor – High temperature indicated
63Oxygen O2 sensor right side – Circuit open or MAP (manifold air pressure sensor ) – out of range (depending on the car model )
64Oxygen O2  sensor right side – Lean mixture indicated
65Oxygen O2 sensor right side – Rich mixture indicated
66A/C (Air conditioning ) pressure sensor – Circuit low pressure
67A/C (Air conditioning ) pressure sensor – Circuit or a/c clutch – circuit failure (depending on the car model)
68A/C (Air conditioning ) compressor relay – Circuit failure error
69A/C (Air conditioning ) clutch – Circuit/pressure high
70A/C (Air conditioning ) refrigerant pressure – Circuit high
71A/C (Air conditioning ) evaporator temperature sensor – circuit low
72Gear selector switch – Circuit error/fault
73A/C (Air conditioning) Evaporator temperature – Circuit high
75Digital EGR #2 – Solenoid error/faulty
76Digital EGR #3 – Solenoid error/faulty
77Digital EGR #1 – Solenoid error/faulty
79Vehicle speed sensor (SS) – Circuit signal high resistance
80Vehicle speed sensor (VSS) – Circuit signal low resistance
81Brake input data – Circuit faulty
82Ignition control (IC) 3X – Signal error/faulty circuit
85Prom –  Error/faulty circuit
86Analog/digital – Pcm error /faulty circuit
87Eprom – Error / faulty circuit
99Power management – Error / faulty circuit

OBD1 Connector Location

Obd1 Connector

The OBD1 connector is usually located under your steering wheel, under the dash. The connector may have a black plastic cover, which you have to remove before accessing it. The connector is often black and has 12 pins on it; pretty easy to identify.

Check the image above to see what an OBD1 connector looks like

OBD1 Connector Wirings Pinout

The OBD1 connector has 12 pins, but not all of them are used in most car models. The standard pins like the ground, power, and a diagnostic pin are the same in most car models though.

Make sure you connect your wires correctly, as if you are not careful, it may damage your vehicle’s electrical system and control units, which can be very expensive.

This is how the pinout of the OBD1 connector looks like in most car models, check your repair manual for the exact pinout:

Obd1 Pinout
  • A = Ground
  • B = Diagnosis Terminal
  • C = A.I.R
  • D = Service engine soon light
  • E = Serial Data
  • F = T.C.C
  • G = Fuel pump
  • H = Brake Speed input
  • J = None
  • K = None
  • L = None
  • M = Serial Data 

RELATED: ELM327 Bluetooth Pin/Key Code

How to Read OBD1 Codes at Home

Obd1 Jump Wire

Our reading method without a diagnostic tool is to make short the circuit of pin A and pin B. The car will then enter the diagnostic mode and flash the “check engine Light” several times, and we should count the flashes to figure out the diagnostic codes.

How to read the OBD1 codes:

  1. Always connect a car battery charger to your car when doing any electrical work that requires the ignition to be on. Low voltage can cause a lot of trouble with the troubleshooting and many error codes that we do not want.
  2. Put a jumper wire between PIN A and PIN B.
  3. Let the jumper wire sit there and turn the ignition to ON. Do not start the engine.
  4. The check engine light will begin to flash. Count the flashes. There will be a longer pause between the codes if you have several trouble codes and a shorter pause between the trouble codes’ digits. For example, code 16 = 1 flash * Pause * 6 flashes.
  5. When all trouble codes are outputted, it will flash the code 12 – 1 flash * Pause * 2 flashes.
  6. Write down all the trouble code numbers you got and check the trouble code table further down in the article.
  7. Remove the jumper wire and car battery charger.

OBD1 Code Reader

Obd1 Code Reader

There are also a lot of OBD1 code readers on the market to make the job easier. With an OBD1 code scanner, you do not have to short the connector, and you do not have to count the flashes on the dashboard.

You will get the problem in clear text on your device, and this is, of course, a great investment to make if you are reading a lot of trouble codes from older vehicles.

There are several different code scanners on the market in all different price ranges. Some scanners can read both OBD1 and OBD2 codes, but these are pretty expensive. One really affordable scanner that I found is the Innova 3123. You have two different options, Ford or GM vehicles, you can choose from. If you want to take a further look at the scanner, you can find it here on Amazon:

Innova 3123 Gm Obd1 Code Reader
INNOVA 3123 GM OBD1 Code Reader
  • Safely accesses the on-board computer to...
  • Works on most General Motors domestic...
  • Connects to your vehicle's computer...
  • Will not harm the vehicle's computer...

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Obd1 pinout gm

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Infinity ECU downloadable Pinout, and testing sensors on Wratchet

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