Question about 2002 Pontiac Grand Am

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I have 2002 pontiac grand am 2.2 liter. Car shut off while driving. It cranks over fine. Won't start due to no spark. Changed ignition control module crankshaft sensor and Coil packs still no cigar? No spark??

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Could be the timing chain/belt. Common problem with 2.4 engines.

Posted on Aug 12, 2010

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  • Pontiac Master
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Wow, you changed the ignition control module, crank sensor, and coil packs and no spark?

Take to an auto electric shop where they can test the wiring to see if there are any breaks between the sensors or parts you already invested in.

Can your scanner communicate with the PCM?
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Powertrain Control Module (PCM) Operation The OBD 2 Engine Management System (EMS) computer can be a single computer comprised of several solid-state components or a multi-microcomputer device. This computer controls the functions of the EMS and performs OBD 2 diagnostic routines. These two distinct portions of the OBD 2 EMS computer function, in conjunction, with each other. The computer architecture and software design allows the OBD 2 EMS computer to adapt its operating strategies to a variety of conditions to optimize the EMS. Federal guidelines require the EMS OBD 2 computer to continuously monitor the operating conditions of the EMS. It must also record and report any system or component failure that may cause tailpipe emissions to exceed typically 1-½ times the federal test procedure.
The OBD 2 EMS computer is specifically designed to perform powertrain system management and monitoring. Regardless of the manufacturers design and implementation of operating strategies, all computers are designed and built following the same basic considerations.
All computers contain one or more microprocessor. Microprocessors are constructed of a complex arrangement of digital circuits. One microprocessor may contain upwards of 250,000 logic circuits. These are housed in a silicon-based integrated circuit (IC) no bigger than an area of approximately ¼ inch square. The microprocessor cannot perform calculations and decisions without instructions that are programmed into the computer’s memories.
IC Micro Processor One single microprocessor, called the Central Processing Unit (CPU), is dedicated to maintaining control over the entire computer. The CPU performs all of the calculations and logical decisions. Operating instructions for the CPU are preprogrammed into other memory locations and are ‘read-only’ programs. These programs are permanent and generally cannot be altered by service personnel in the field.
A program, in general, is a set of instructions arranged in a specific order to accomplish a specific task. Each instruction in the program is assigned to a specific location, or address within the computer’s memory. Only the address of where the instruction is stored is retained in the CPU. When the CPU requires information to perform a calculation, it looks for the address of the required data and then copies the data from the memory location. This copy is retrieved and temporarily retained by the CPU for processing. Retrieving programs in this manner ensures that the information programmed in memory is retained and does not change.
The following symptoms can be caused by an open, short to ground, short to power or excessive resistance in the power and ground circuits, data line communication malfunctions and /or component failure.
Related Symptoms

  • No Crank
  • No Start condition
  • No communication with scan tools
  • No communications with other modules
  • MIL lamp illumination
  • Intermittent component functions
  • Poor fuel economy
  • High emissions
  • Drivability concerns (stalling, bucking, stumble etc.)
  • Charging system malfunctions

Posted on Jul 09, 2010

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Posted on Jan 02, 2017

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2 Answers

My 2004 3800 series pontiac bonneville will start up fine and idle fine but seems like when it gets warm it shuts off?


P0172 is a rich condition > I dough it would cause it to shut off after it warms up . If real rich , it would cause a no start at all . Fouled spark plugs , you can pull the spark plugs to see if they are black or wet with fuel . Starting and running till warm then shutting off is a classic sign of an electronic component starting to fail . Does it start right back up or do you need to wait till it cools down ? If it doesn't start right back up , pull the two plug wires off the same coil and have someone crank it over . Is there spark ? If not , probably ICM - ignition control module is bad . There are videos on youtube on how to test GM DIS ignition systems . (distributor less ignition systems )

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I have a 2004 Pontiac grand Prix. It cranks but won't start. I took off the spark plug wires like I watched in a video and saw nothing.I was driving it and the car just cut off and won't start back up


could be a cam/crank sensor problem
could be a broken timing belt/chain not working the sensors
run the fault codes to determine the problem area

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Why does my 2003 pontiac sunfire lose all power while driving


That can be the symptom of a bad Ignition Control Module, or also a bad crank position sensor. The ICM can be taken off and tested for free at any parts store. The crank sensor circuit can be tested on the car with a multi-meter. Also small motors (like a fuel pump motor) that are starting to fail can sometimes work until they get hot and then stop working until they cool down again.

Next time the car shuts down and won't restart, check for spark on a spark plug wire with the engine cranking over. If you have no spark, suspect the ignition control module or the crank position sensor. If you still have spark, but won't start, check if the fuel pump is putting gas up to the engine.

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2002 saturn sl won't start, turn over but won't start


If the engine fires up for a second or two with starting fluid then the fuel pump is weak.I would check the fuel pressure and if its not within the specs then replace the pump and filter.

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1 Answer

I have 2002 Pontiac Grand Am and I cleaned out the spark plugs and replaced them. The car still only cranks and will not turn over. Any help you provide will be greatly appreciated.


Possible causes:
Ignition coil bad
Electronic ignition module bad
Coil wire to the ignition module bad
All of the above.

Pull out one plug and ground it to the engine. Have someone crank the engine as you watch for a spark. No spark- see above. If there is spark the the problem lies in fuel/air/compression.

Dec 09, 2010 | 2002 Pontiac Grand Am

2 Answers

1993 grand am no spark


You said you changed the ecm module, is that the ecm or the ignition module. Do you have access to a scanner to check cranking rpm? That way you can test the new crank sensor and the wiring and the ignition module.

Jan 25, 2009 | 1993 Pontiac Grand Am

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