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Tips how to fix pcm to avoid more problem

New battery and starter original engine not cranking and security light continues blinking

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  • Cars & Trucks Master
  • 40,820 Answers

Check the battery in the key. reset the immobiliser in the cpu.

Posted on Apr 25, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 355 Answers

SOURCE: 99 buick lesabre, battery ok, turn key to start, nothing

The security system (VATS/PassKey) is faulty. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.

Posted on Jun 18, 2010

SOURCE: 2003 Caravan No Crank, 3.3L

This is a bad PCM. Try to disconnect the security system first and if it still does not start then it is the PCM.

Posted on Aug 11, 2008

  • 217 Answers

SOURCE: 2001 pt cruiser limited won't crank

needs a battery but be careful cause sometimes a bad alternater will cause the battery to go bad

Posted on Jan 17, 2009

cincinaty5
  • 132 Answers

SOURCE: 2003 Dodge Caravan 3.3 No Crank, No Start

replace the neutral safty switch

Posted on Aug 28, 2009

  • 184 Answers

SOURCE: 1992 Toyota Camry won't crank

Check the ground cable going from the battery to
alternator, then to chassis. Make sure there is no
rust at the chassis ground wire terminal, and that it
is very tight. The fusible link will be off the alternator
red power cable,usually, but not 100% on that car.
Good luck.

Posted on Mar 30, 2010

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2002 chevy trailblazer and it will not crank or start and the key has gotten stuck in the ignition. I also got a jumpstart and it still didn't start. What is wrong, Please?


Could be a number of thing's , can you do automotive electrical testing ? Do you know if starting is PCM / ECM controlled or BCM controlled ? Do you know what these are ? BCM - body control module , PCM/ECM - engine computer !
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.
Do you know what a park neutral safety switch is ? What do you mean key stuck in ignition ? Can't turn the key to off position , or you can an the key will not come out ?
Your best bet , take it to a qualified repair shop .

Apr 04, 2017 | 2002 Chevrolet TrailBlazer

1 Answer

O5 Colorado got the ecm code when I shut off the truck and now it won't turn over


What ECM code ? What is everything else that is working ? Headlamps , inside lighting , radio etc... When you turn the key on do the instrument cluster warning lights come on then off a few seconds later ? Anti-theft (security light ) On ? Flashing ? Do you know what all is involved ,or happens when you turn the key to start ?
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.


Verify that no starter relay, immobilizer, or automatic transmission DTCs are set that would cause the PCM to disable starting.
? If the specified DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the scan tool PCM Ignition 1 Signal parameter with a scan tool. The reading should be greater than 10.0 Volts.
? If less than the specified value, test the ETC, PCM 1, and PCM B fuses, the RUN/CRNK relay, and the PCM ignition voltage circuits for an open/high resistance. If the circuits test normal, replace the PCM.
Ignition OFF, remove the START relay.
Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
? If the test lamp does not illuminate, test the START fuse and the B+ circuit for an open/high resistance.
Ignition ON, transmission in Park or clutch pedal pressed, verify that a test lamp illuminates between the PNP/clutch start switch signal circuit terminal 86 and ground.
? If the test lamp does not illuminate, test the IGN fuse, RUN/CRANK relay, PNP/clutch switch ignition voltage circuit, and the signal circuit for a short to ground or an open/high resistance. If the circuits test normal, test or replace the PNP switch or the clutch start switch.
Connect a test lamp between the park/neutral signal circuit terminal 86 and the relay coil control circuit terminal 85.
Ignition ON, transmission in Park, or clutch pedal pressed, turn the ignition switch between the START and RUN positions. The test lamp should turn ON and OFF when changing between the commanded states.
? If the test lamp is always ON, test the relay control circuit for a short to ground. If the circuit tests normal, replace the PCM.
? If the test lamp is always OFF, test the relay control circuit for a short to voltage or an open/high resistance. Test the PNP/clutch start switch signal circuit for an open/high resistance. If the circuits test normal, replace the PCM.
Install the START relay.
Connect a test lamp between the starter solenoid terminal and ground.

Mar 12, 2017 | Cars & Trucks

3 Answers

I changed the starter with new as old one was not turning. After replacing new starter my truck does not crank and start, Please help me to start my Truck. Anti theft light is blinking all the time.


You solved your own problem.
The anti-theft system is probably keeping it from starting.
Get the system checked out and you may find the problem is the chip in the key.

Nov 05, 2015 | 2004 Ford Explorer

1 Answer

Checked batt and starter have no dash lights only check engine starter will not even click


If your check engine light is on you should have it checked for DTC'S - diagnostic trouble codes ! An there is no SECURITY light lit on the instrument cluster ? In the underhood fuse / relay box is the CRANK RLY , this relay energizes the starter ! If you pull the relay out of it's socket you'll see four terminals or pin's what ever you like . You'll also see four numbers 85-86, 30-87 . 30 an 87 are the starter side circuit . 30 should have battery voltage if tested with voltmeter or a test light , 87 goes to the S terminal at the starter solenoid . 85 an 86 are the control side circuit , one should have battery voltage an the other is control from the PCM/ECM .If you can use a volt ohm meter you can see what is missing to further you diagnosis , voltage , control ! You mite want to do a voltage drop test of the starter circuit - battery cables ! Check fuse PCM/ABS 10amp left I/P fuse box an PCM (crank) fuse 10amp left I/P fuse box .If you haven't done this type of thing before you may want to take to a ASE certified repair shop ! Here I will post a video on relays ! VEHICLE RELAYS Operation Diagnosis

Jul 28, 2015 | 2005 Chevrolet Monte Carlo

1 Answer

Put a new coil pack on crancked it over wouldnt start now it wont crank at all batt. is good and so is starter and fuses


Do you have a flashing red light in the center of the top of the dash when trying to crank it ? Check starter relay in the in under hood fuse / relay box ! The PCM - powertrain control module controls it by supplying a ground to the control side ! Where the relay plugs into the fuse box are four sockets , two should have battery voltage , one should show continuity with ohm meter an one should show open or OL on ohm meter this is from the PCM . when you crank the vehicle over, if no problems with anti-theft system the PCM supply's a ground an the engine cranks over !

Apr 14, 2015 | 2003 Ford Windstar

2 Answers

I have a 2006 crown Vic and it's not tring to start change the alternator have a new battery


so now you have to check the starter system and wiring

you already looked over the fuses, right?

Apr 01, 2015 | 2006 Ford Crown Victoria

1 Answer

Pcm fix tips


check the battery in the key. have it tested to ensure it is still transmitting.

Apr 25, 2013 | Cars & Trucks

1 Answer

2004 Envoy XUV doesn't always crank.


I want to see if i catch your drift ! When you turn the key in the ignition switch to start , nothing happens ? Have you tried moving the gear slector to the neutral position to see if it starts then ? Park neutral safety switch problem , maybe .
Here is a description of how it works or how it's suppose to work .
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.

May 13, 2017 | 2004 GMC Envoy

1 Answer

1999 tahoe will not crank with ignition key


it sounds like the problem but the question is why wont the pcm start the car. with the key turned to on the service engine light sould be on. if not the pcm has no power.

Dec 31, 2009 | 1999 Chevrolet Tahoe

1 Answer

2003 Caravan No Crank, 3.3L


This is a bad PCM. Try to disconnect the security system first and if it still does not start then it is the PCM.

Aug 09, 2008 | 2003 Dodge Caravan

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