Question about Chevrolet Impala

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2001 3400 impala: no crank at any time. have tried to install jbs universal learning bypass module, no success. maybe installed wrong since there is no remote start? if I jump the starter vehicle will run for appros 2 sec before it quits, I assume that is all the fuel supplied before security cutout. display rotates thru- security,battery,service,change oil, etc... these lights contiuously cycle and do not change in at least a one hour time frame. any ideas on how to get this thing to run? don't care about thieves or funky panel light info.

Posted by colgebndmike on


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jack layton

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  • 5,308 Answers

I don't know anything about a bypass module? Maybe the manufacturer can walk you through your problems? Otherwise
Make sure battery has a full charge. With original wiring, try the 30 minute relearn procedure. Any applicable trouble codes? You may need a scanner that can communicate with your security system?

2001 3400 impala:   - 30-p3gp0yoguc1gjwt4ch4mxwmx-3-0.jpg

Posted on May 04, 2017


5 Related Answers


  • 1 Answer

SOURCE: 95 F150 wont crank

the starter should be replaced. The solenoid is kikcing the pinion out but there is no contact being made to turn the starter motor. I have the exact same truck and before i changed the starter used the old starter tap trick. Tap the starter casing with a hammer and it should start turning again. hope this was helpful for you. Good luck.

Posted on Nov 07, 2008



  • 398 Answers

SOURCE: 1987 F150 302 ci. EFI, Automatic,

try over riding the starter relay on the fender ,it has one there right?. dont go to a mechanic yet. the engine aint seized. if it doesnt have this relay then i would get the alternator tested. if you want to test it yourself it can be costly for the right equip. autozone usually tests for free. i dont know were you live so if theres not an autozone. let me know if you cant get it tested.

Posted on Mar 27, 2009


  • 36 Answers

SOURCE: wont start security light stays on

Body Control Module (BCM) on both counts. Find a shop in your town that specializes in electrical systems to test it. Beware, these can be intermittent problems, so make sure they keep it until the car does what you have observed. Expect to spend about $450 for the replacment. Dealers quoted me between $700 and $1,100 for the same repair. By the way, a new BCM will probably only last you about 12 months.

Posted on Aug 14, 2009


  • 101 Answers

SOURCE: 1994 buick park ave, wont crank over,

Pass key is the security system which disables the car if it is stolen. You need the remote or a key with a chip to start the car. go to a dealer, prove ownership with registration and they will be able to help you out

Posted on Sep 10, 2009


  • 355 Answers

SOURCE: I installed a pljx vats (keyless entry) bypass to

For some reasons the bypass is not working, so you need the key to be recognized by the Theft Deterrent Module (TDM) before the fuel enable signal to the PCM can be activated.
There is a great DIY way of bypassing the VATS system entirely, including the TDM (that goes faulty very often with the age of the car). You can find the write-up here:

Posted on Jan 27, 2010

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Bypass module instal on 03 impala installed Gmdlbp nothing there was something mentioned about a flash

first bypass module ? if tried to do so most time vehicle will not start --and ignition replacement new or used need to be flashed to vehicle

Aug 16, 2018 | Cars & Trucks

1 Answer

How do I override the pass lock bypass on 2004 impala ss?

You can't ! Dealer maybe able to , going into the BCM with factory scan tool an turning it off !
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent system prevents the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the ignition lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM). The message enables the fuel injectors and the crank relay.

May 26, 2017 | Cars & Trucks

1 Answer

What is the passcode for the anti theft system

his vehicle has a the PASSLOCK II key
based engine disabling system.

You can attempt to put the key in the ignition,
turn it on to just before cranking and then leaving
it that way for 10 mins. After that,
some PASSLOCK systems will re learn the code
and allow for starting. But if not, the system
will either need to be seen by GM or, a bypass module
is required to circumvent.

If left unchecked, it will continue to lock down
the fuel injector rail, and you will need to tow
it in to GM for evaluation, and resetting anyway.

Bothersome, but can be fixed.

I suggest the PLJX bypass kit to get around
this issue.

This Passlock Bypass Module is designed to momentarilly
allow the engine to remote start by sending a proper
coded pulse to open the fuel rail passlock injector
cut off circuit.

The output from an alarm/remote starter
would then shut down the pulse, once it has detected
the engine has engaged, and preserve the integrity
of the passlock system.

That is it's designed purpose.

However, in your case, this input wire on the PLJX module,
instead of going to a momentary ground pulse from
an alarm/remote starter,
would go to a constant chassis ground, through
the bypass module, grounding out the PASSLOCK.
The PASSLOCK would then always be bypassed as long
as that wire is chassis grounded.

I can not speak about a damaged passlock system,
like if a thief has destroyed it, because I do not
get into this part of GM'S security application.
But as a happy coincidence to installing
after market remote starters, this does work on bypassing
passlock in most all GM vehicles we've run into,
including your year GM vehicle as well.

Also, this is a self learning, resistor sensing
and adjusting module. Once the VATS wires have been tapped,
you would press the program button to learn,
and it does. The car should then allow start
with any hardware store key.

It would on yours as well.

You might want a car alarm installer to do this
for you, the fair rate being around 50. to 75.
for labor.

Jan 26, 2011 | 1999 Chevrolet Malibu

1 Answer

Engine stalls driving down the road or on take off. Had code 42. electronic spark tining. E S T circiut fault. Cleared codes and installed a fuel pressure gauge. On test drive the motor, (3.1 EFI) still...

Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system. During cranking, the timing is controlled by the ignition module and the ECM grounds the EST line. It expects to see no activity on this line at this time. When the ECM enters EST mode, it applies +5 volts to the BYPASS line and expects to see voltage variations on the EST line.
Reasons for the ECM to set Code 42:
1. System in BYPASS mode (i.e. EST line supposedly grounded) but activity sensed on EST line
2. System in EST mode (i.e. BYPASS line driven with +5 volts) but no activity seen on the EST line

Possible causes include:
1. BYPASS line is open or grounded
2. EST line is open or grounded
3. Poor connections between ignition module and ECM
4. Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise
5. Faulty or incorrect ignition module
6. Faulty ECM
7. Faulty Pick Up Coil
8. Faulty Ignition Control Module
9. Faulty Crank Sensor or the Crank Sensor magnet probe could be cracked

Jan 15, 2011 | 1991 Chevrolet Lumina

2 Answers

Bulldog Remote Start Problem

if thats a key resisor bypass i never heard of that, i would check with with bulldog to see if may be a set upproblem

Jan 24, 2010 | 2000 Chevrolet Impala

1 Answer

I installed a remote car starter. I was wondering

use the 791 and wire it up for VATS, you will not use the loop at all

Dec 16, 2009 | 1997 Chevrolet Lumina

2 Answers

SEcurity light came and car wouldnt start

I'm having the same issue and had the ignition replaced even thought I told the dealerhsip that I read this will not help. I did some reasearch and found that a bypass system is the best way to go. I called around to local places that do installation of radios, remote start ..stuff like that and they can install a bypass system for $120.00. I aksed him is this will solve the problem and he says he does it all that time and it works well. You may want to look into that...

Apr 02, 2009 | 2002 Chevrolet Impala

2 Answers

01-LS stops when idling/driving/hot/cold....

make sure to check for and aftermarket ignition module installation in other words make sure the ignition module is factory and not aftermarket,
this is not a fuel problem because fuel problem acts diferent
but coul be your ignition module or your crank sensor

May 28, 2008 | 2001 Chevrolet Impala

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