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Auto command 20023 module and 30amp fuse/holerhas been repaired/replaced.Everything but the run time works as usual.runs a few seconds then shuts off.What's wrong here?What have I missed here.

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  • Cars & Trucks Master
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In two posts, you missed telling us the year, make, and model of your vehicle. When you post for the third time, PLEASE include that info,

Posted on Dec 08, 2016

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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

1 Answer

2002 GMC Sonoma, is there a way to disconnect auto lights, just turning them off doesn't work. Truck will just shut off going down the road, have replaced steering column and brain, all lights everyth


Does yours have ZR2 option.?
The automatic lamp control (ALC) system and the daytime running lamps (DRL) feature, except the Canadian version, can be temporarily disabled by performing the following procedure:
  1. Turn the ignition to RUN.
  2. Press the DOME OVERRIDE button 4 times within 6 seconds.
A chime will sound informing you that the system is off. The system will remain disabled until the ignition is cycled off and then on or by pressing the DOME OVERRIDE button 4 more times within 6 seconds. The chime will sound again signaling that the system has been reactivated.
What brain did you replace ? You people crack me up , trying to save money by doing it yourself . You have no idea of the complexity of the system . You could have taken to a Qualified repair shop an spent less . Why on earth do you thing this has anything to do with the truck shutting off ? An it could have been as easy as hooking up the Tech 2 factory scan tool . There are a number of DTC'S - diagnostic trouble codes that could be set for the ALC .
DTC B2648
The body control module (BCM) monitors the courtesy lamp relay coil control circuit in order to determine if the daytime running lights (DRL) or the auto headlights (ALC) should be turned ON in the AUTO mode. When the BCM senses the ambient light sensor voltage is between 1.7 volts and 4.7 volts, the DRL will be commanded ON. When the BCM senses the ambient light sensor voltage is between 0.2 volts and 1.0 volts, the ALC will be commanded ON.
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the ambient light sensor parameter in the Body Control Module (BCM) data list .
Does the scan tool indicate that the ambient light sensor parameter is within the specified range?
0.2-4.7 V
DTC B2647
The body control module (BCM) monitors the ambient light sensor signal circuit in order to determine if the daytime running lights (DRL) or the auto headlights (ALC) should be turned ON in the AUTO mode. When the BCM senses the ambient light sensor voltage is between 1.7 volts and 4.7 volts, the DRL will be commanded ON. When the BCM senses the ambient light sensor voltage between 0.2 volts and 1.0 volts, the ALC will be commanded ON.
DTC B1398
And , if it was the BCM - body control module you replace , It's no wonder the truck shuts off , Don't know if your aware of it , but that brain needs to be programmed .
Important: If the module is replaced, the module must be programmed prior to performing the Passlock Learn procedure.
  1. Ensure that the following conditions exist in order to prepare for BCM programming:
  2. ?€¢
    The battery is fully charged.


    ?€¢
    The ignition switch is in the RUN position.


    ?€¢
    All accessories are turned OFF.


    ?€¢
    All modules and devices are connected and functioning properly before programming.

  3. Follow the SPS instructions on the Techline Terminal and scan tool to program the BCM.
  4. If the BCM fails to accept the program, perform the following steps:
?€¢
Inspect all BCM connections.


?€¢
Verify that the SPS Techline Terminal and scan tool have the latest software version.




What

Oct 23, 2016 | 2002 GMC Sonoma

1 Answer

Car wont start


Hi Martha, I'm glad to help! There are 2 senarios when someone says a car want start. (1) The engine is turning over but it won't start and run. (2) You turn the key to the runs position and everything comes on but it does nothing, example the engine will not turn over. The first senario: You'll need to check fuel pressure to see if there is any. Pressure should be around 50 PSI. NEXT: you'll need to check for spark because you need to know if it is firing when you turn the engine over. This will narrow the problem down to either fuel or ignition. If one of these turns out bad, then further diagnosis will need to be done to find out what the problem is. (2) The second senario: If you turn the key to the run position and nothing happens. This could be a blown fuse, a run start relay, a starter, or WIN Module. Martha, working on these vehicles everyday, here is what I've found the most. The start run relay goes bad on these vehicles a lot. It's under the hood in the relay / fuse BOX. You can swap the relay with another one that looks the same and see if it starts. CAUTION: Do Not sway the relay with the Auto-Shut-Down relay are you'll have the same problem. If that doesn't work, here's something else you can try. Have someone tap the starter with a small hammer while you hold the key all the way to the run position like your trying to start the engine. If they hit the starter and it starts, then replace the starter. Here's something else you can try. If it is the WIN Module ( Ignition Switch) you can unhook the negative battery cable for 20 seconds then reconnect it and see if it starts, If it starts You'll need the repair shop to repalce the WIN Module because it will need to be programmed and the keys programmed to the WIN. Hope this helps and have an awesome day Martha.

Apr 18, 2014 | 2006 Dodge Charger

1 Answer

I have a 2004 dodge Durango hemi 4wheel drive I'm losing power to the fuel pump I turn the car on three times the third time it will stay running for like ten seconds then the vehicle shuts its self down...


you could have a few problems,check the "auto shut down relay " that is in the pdc ( fuse box) under the hood several of them are the same so substitute the A/C relay and see if that works, Or you might have an issue with the SKIM module that reads the key if it does not read a programed key it will run for a few seconds and shut the fuel off to prevent theft-is there a little red light on in the dash? thats a security light for the theft system

Apr 08, 2014 | Cars & Trucks

1 Answer

HVAC Blower stopped working


The fuse you replaced powers the hvac control. The run relay is powered by a 30amp fuse in the fuse box near the battery.
Is the relay getting power from that 30amp fuse ?

Jul 10, 2013 | 2004 Saturn ION

1 Answer

Fuel pump runs for 20 seconds after shutoff It has been stalling lately


POSSIBLE - * IGNITION CONTROL MODULE *
In some cases the ICM will continue to send GROUNDS(power+/-) to your fuel injectors , fuel pump , ignition coil(s) after the key has been shut off. I just finished up a 1992 Corvette 5.7 l that would only fire when you let up off the starter . The ICM is going bad in my opinion and not responding to the PCM / ECM commands or a delay in response ( 20 seconds after shut off )
Hope this Helps , Flaming Ratchets Auto Repair

Nov 03, 2012 | 1990 Pontiac 6000

2 Answers

2005 impala heater fan runs constantly


read this post on what's causing blower motor to run all the time.

http://ricksfreeautorepairadvice.com/blower-motor-wont-shut-off/
Blower motor wont shut off Ricks Free Auto Repair Advice

Sep 14, 2017 | 2005 Chevrolet Impala

1 Answer

I have a carburated manual 88 Honda accord that usually about 2 miles down the road the tachometer will suddenly drop to nothing but the engine still turns for a few seconds. It starts back up pretty...


With the tach dropping and still running, even for a few seconds, I would go over anything ignition related. The tachometer is going to get its signal from a coil or module and with it dropping but the engine does not shut off immedicatly that makes me think one of those parts is faulty.
Most ignition modules can be tested at an Auto Zone for free.

Sep 18, 2011 | Honda Accord Cars & Trucks

1 Answer

1987 ford temp automatic - will start when engine is cold, run until it warms up, approximately 5-10 minutes, then just shuts off.


This sounds like a bad control module, this controls the spark and timing, this is common, the engine runs until module gets hot then engine dies, try replacing the module, another thing is to remove the module and take to a napa auto parts store they will test i for you, make sure they test it a few times to get it hot. hope this helps.

Aug 30, 2010 | 1987 Ford Tempo

1 Answer

Air Conditioning on 2001 Mercedes-Benz CLK


You could remove fuse 25 (30amp) in the underhood fuse panel, but then no blower for AC, heat, or defrost. Need to replace blower regulator.

May 18, 2009 | 2001 Mercedes-Benz CLK-Class

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