What is trouble code 12 on a GM car?

Trouble Code 12 is a special case code that is not logged into the ECM’s Non-Volatile Memory (NVM) when detected. When the ignition is ON and the ECMdetects no ignition reference pulses coming from the ignition module, it illuminates the Service Engine Soon lamp.

What does GM code 12 no distributor pulses mean?

GM Code 12 No Distributor Pulses. Trouble Code 12 is a special case code that is not logged into the ECM’s Non-Volatile Memory (NVM) when detected. When the ignition is ON and the ECM detects no ignition reference pulses coming from the ignition module, it illuminates the Service Engine Soon lamp.

What does code 12 on Check Engine light mean?

When flashing the Check Engine Light to read codes, code 12 will always display first, indicating the diagnostic system is active The engine will not run with a “hard” code 12 set.

What does code 12 mean on ground terminals?

Ground terminals A and B (see diagram below) with the ignition “ON” and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the “CHECK ENGINE”, “SERVICE ENGINE SOON” or “MALFUNCTION INDICATOR LAMP” or light.

What does trouble code 12 mean on an ECM?

Trouble Code 12 is a special case code that is not logged into the ECM’s Non-Volatile Memory (NVM) when detected. When the ignition is ON and the ECM detects no ignition reference pulses coming from the ignition module, it illuminates the Service Engine Soon lamp.

What is the code for service engine soon?

In this mode, the computer will display a Code 12, three consecutive times, by flashing the “CHECK ENGINE”, “SERVICE ENGINE SOON” or “MALFUNCTION INDICATOR LAMP” or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession. 2.

When flashing the Check Engine Light to read codes, code 12 will always display first, indicating the diagnostic system is active The engine will not run with a “hard” code 12 set.

Where is the trouble code on a GMC?

When retrieving GMC trouble codes with an OBD II scan tool, proceed as follows: 1. Connect scan tool to the 16-pin data link connector (DLC) located underneath the steering column. The connector may have a removable cover. 2. Turn the ignition on.

What does code 12 mean on GM OBD?

Rather, the problem would be a crank, no-start condition. If code 12 does not flash, that would indicate a communication problem with the ECM. Code 12 does not show when reading codes with a scan tool.

Trouble Code 12 is a special case code that is not logged into the ECM’s Non-Volatile Memory (NVM) when detected. When the ignition is ON and the ECM detects no ignition reference pulses coming from the ignition module, it illuminates the Service Engine Soon lamp.

What are the engine codes on a Chevy truck?

Engine combinations vary for each model and year. Some of the more popular truck engine codes are C for a 6.2 diesel, F for 5.0 gasoline engine, R for a 5.7, and W for a 4.3. Use an Internet VIN decoder to find the engine specifications for your truck. The 10th character indicates the year of the vehicle.

How to check the authenticity of a Chevy k1500?

This format was implemented by the ISO institute. Every car manufacturer is obliged to mark all its vehicles in this special format. This online service allows a user to check the validity of the car and get detailed information on almost any VIN number, search for Chevrolet K1500 car parts and check the car’s history.

Where can I Find my Chevy k1500 parts?

Please check Chevrolet K1500 car parts catalog for additional information if you’re looking for parts to repair your vehicle. You can search Chevrolet K1500 parts by VIN number . It is possible to get market price of new or used Chevrolet K1500 by VIN number.

What kind of engine does a 1995 Chevy 350 have?

Since then, it has been used in many different styles of vehicles. The 1995 Chevy 350-cubic-inch engine come in three versions: low-compression, medium-compression and high-compression. The low-compression version of the 1995 Chevrolet 350 was used in four vehicles: Suburban, G30 van, C/K3500 and C/K2500.

What was the compression ratio of a 1995 Chevy 350?

Low Compression The low-compression version of the 1995 Chevrolet 350 was used in four vehicles: Suburban, G30 van, C/K3500 and C/K2500. It had a cylinder bore of 4 inches, a piston stroke of 3.48 inches and an 8.3:1 compression ratio. This engine produced 180 horsepower and 295 foot-pounds of torque.

Why does my GM OBD not Flash code 12?

The engine will not run with a “hard” code 12 set Chances are you will never need to diagnose a code 12. Rather, the problem would be a crank, no-start condition. If code 12 does not flash, that would indicate a communication problem with the ECM. Code 12 does not show when reading codes with a scan tool.

What kind of problem does a 93-95 Chevy Van have?

Wiring open circuit/short circuit to ground, supply wire, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM

What does the code 45 on a GM ECM mean?

This is the description of a Code 45 as set on GM products It is an indication of a rich mixture as indicated by the oxygen sensor readings. Circuit description: The ECM supplies a voltage of about .45 volts between the appropriate terminals of the sensor. (If measured with a ten megohm DVM, this may read as low as .32 volt).

What causes a GM OBD trouble code 33?

Engine running rich (too much fuel, black smoke from exhaust) Due to erratic engine vacuum, other engine performance problems can cause a code 33 to set

What is the code 45 on a GM oxygen sensor?

How to read Trouble Codes on 88-95 GM cars and trucks?

To read the trouble codes when your check engine light comes on on one of these old cars, you just need to put a paperclip in between two terminals, and then turn the ignition on, and the check engine light will flash the code, which you can interpret to find out what is wrong with your engine.

Why does my GMC have a fault code?

Once you locate the battery, the method for clearing the code is the same, regardless of the year, make or model of GMC vehicle. Fault codes can be set off in a vehicle for a variety of reasons, ranging from a loose gas cap to a major mechanical problem.

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)

What does it mean when code 12 does not flash?

If code 12 does not flash, that would indicate a communication problem with the ECM. Code 12 does not show when reading codes with a scan tool. If there is a communication problem, the scan tool will let you know.

What is the TBI code on a 1990 Chevy truck?

Consult a service manual or see below for any check engine light code definitions. You can use a late 80’s or early 90’s GM TBI definition. If you have access to a scan tool use a hook up for a 1990 350 cu. in. 5.7L Chevrolet truck. For some scan tools enter VIN 10th“L” 3rd“C” 8th“K”.

How did the Chevy 12 bolt get its name?

Chevy 12 Bolt Identification. The GM 12-bolt rear axle assembly receives its name due to having 12 bolts on the rear cover of the housing. This rear axle was available in GM’s high-performance intermediate cars, full-size vehicles and light-duty trucks.

What does the b0012 code on a Chevy mean?

Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. What does this mean? The cost to diagnose the B0012 CHEVROLET code is 1.0 hour of labor.