Question about 2004 Chevrolet TrailBlazer

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Last night, reset PCM by unplugging PCM bat and PCM ignit fuses, waited 5 minutes, replaced fuses and started engine with trailblazer running fine until this evening when it suddenly lost power and cut off. This was repeated a couple of times and seems to be recovering. Can there still be a problem with the PCM recovering and or needing reprogrammed?

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Some of those are a little tempermental, give it a few drive cycles

Posted on Nov 11, 2010

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I have trouble starting my van and later on the check light came on (P1607). The car can no longer start but sometimes when I fiddle with the battery it would start up again and when it does it runs fine....


P1607 means "powertrain control module (PCM) internal circuit malfunction". According to the factory service manual, a low battery condition can cause this. This code can also pop up after the battery has been jump started.

You need to reset the PCM. To do this, turn the ignition switch off. Remove the No. 13 fuse (7.5Amp) from the passenger's under dash fuse/relay box for at least 10 seconds. Put the fuse back in. That should complete the reset.

Now to check again for the code: turn the ignition switch to on (not start.) Wait 30 seconds. If the check engine light stays OFF, turn the ignition switch off and wait 10 seconds. Turn the ignition switch back to on (not start). Wait 10 seconds. If the check engine light stays OFF, you had an intermittent fault and it has now been reset--everything is fine. If the check engine light comes back on during these checks, have the code that set read out. If the code is P1607 again, then you may have to have the PCM tested at the dealership for an internal fault.

Feb 04, 2011 | 2002 Honda Odyssey

1 Answer

I just replaced the ignition switch and lock in my 2000 alero and now it starts and runs fine but the security light is on and stays on. How do I reset this security light?


TURN THE IGNITION SWITCH TO THE ON POSITION FOR 10 MINUTES WITH ENGINE OFF.UNTIL SECURITY TURNS ITSELF OFF.THEN TURN OFF IGNITION SWITCH WAIT 5 SECONDS.THEN START THE ENGINE.IF SECURITY STILL ON DEALERSHIP HAS TO FIX.

Jan 18, 2011 | 1999 Oldsmobile Alero

1 Answer

HOW DO YOU REPLACE THE ON BOARD COMPUTER OF A 2004 CHEVY TRAILBLAZER


Service of the powertrain control module (PCM) should normally consist of either replacement of the PCM or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures call for the PCM to be replaced, the PCM should be inspected first to see if the correct part is being used. If the correct part is being used, remove the faulty PCM and install the new service PCM.
Important: To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM. For example, when working with a battery cable, PCM pigtail, PCM fuse, or jumper cables.
Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
Removal Procedure
    Important: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. jsmes1027_23.gif
Loosen the PCM harness connector bolts (4) from the center of the PCM harness connectors.
Notice: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.
Remove the PCM harness connectors (2) from the PCM (1).
Remove the PCM retaining bolts (3) and nuts (6).
Notice: Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD) damage to the PCM.
Slide the PCM (1) away from the intake manifold past the mounting studs (5) and remove PCM from the vehicle.
Remove the PCM mounting studs (5) from the intake manifold ONLY if replacing the studs.


It is possible that the pcm made need to reflashed after replacement.

Nov 27, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

I have a 1995 Grand Caravan ES with a rebuilt 3.8L V6. It also has a remanufactured PCM. The engine will run and as it warms (registered on temp gauge) it will start missing and eventually stop. Restart...


Do you get a check engine light? If so, read the codes with a scanner and chase down the clues. Does the PCM match the car and engine? Was the original engine a 3.8L? 5 to 10 minutes is not very long for an engine to cool down appreciably. Hopefully, the PCM codes will indicate whether the missing problem is fuel or ignition related.

Aug 16, 2009 | 1995 Dodge Caravan

2 Answers

1996 Oldsmobile Achieva: Security light flashes upon startup


Here is what you do, but only when the SECURITY light flashes - if it is always ON or OFF it's no use.
Turn the key in the ignition to ON.
Wait for exactly 10 minutes ( SECURITY light will flash for 10 minutes and then stay on SOLID)
Turn the key to OFF
Wait 5 seconds.
Turn the key in the ignition to ON.
Wait for exactly 10 minutes.
Turn the key to OFF
Wait 5 seconds.
Turn the key in the ignition to ON.
Wait for exactly 10 minutes.
Turn the ignition OFF.

Start the car normally.
It has relearnt the keycode and you're good to go.
NOTICE - it takes 30 minutes to relearn, that's THREE cycles of ON - 10 minutes - OFF.

Good luck.

Jul 11, 2009 | 1996 Oldsmobile Achieva

1 Answer

AIR VENT PROBLEM


Chevrolet 2003 TrailBlazer

For a digital air flow system try resetting the HVAC unit. Either take out the fuse for the HVAC module or disconnect the battery for 5 or 10 minutes. Reconnect battery or replace fuse. Turn the ignition to ON and DO NOT STARTor ATTEMPT to START ENGINE !!. You should hear the actuators, motors etc resetting. This should take about 2 minutes . Then you can start engine. If this does not work, you may have a bad actuator under the dash.

Jun 07, 2009 | 2003 Chevrolet TrailBlazer

1 Answer

No power to ignition 96 camero dl


Check the wires to the distributer or to the modules could be poor or no conection. If you can turn the car over but no spark it's probably something to do with ignition, distributer, module, or wiring to the ignition.

Dec 28, 2008 | 1996 Chevrolet Camaro

3 Answers

Service Engine Soon Light on a 2004 Trail Blazer


VERY SIMPLE
1. Turn key to the "on" position but don't start car
2. Pull the PCM BAT and PCM IGN fuses in engine compartment
3. Wait approximately 5 minutes
4. Turn ignition off
5. Replace fuses
6. Start the car and the make sure the light has went off.
then check to see if your gas cap is on right. If this light comes on again then it is time for the dealer. If you can't find them fuses then just disconnect the battery for five minutes reconnect the battery and when you start the truck the light should be out. just let it idle for 2 minutes with no heater or radio on. and you set. I hope this helps you.

Dec 04, 2008 | 2004 Chevrolet TrailBlazer

6 Answers

1997 cadillac deville anti theft system comes on and i cant get my car started.


Its your engine to chassis ground I had same problem replace wire or try sanding paint around connection for better connection. The wire is located on top left of engine, very visible

Jul 23, 2008 | 2001 Cadillac DeVille

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