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How to fix dtc u001

Vehicle would not start

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I have a passkey 3 on my 2002 cadillac deville and the security system is not letting my car start or crank does anyone know how to fix this problem i'm having without me having to take it to a dealer


You need a capable scan tool to check DTC'S - diagnostic trouble code's .
DTC B2734
DTC B2960
DTC B3031
DTC B3055
DTC P1630
DTC P1631

These would tell why the PCM - engine computer isn't starting the vehicle . There is no by-pass for this anti-theft system . The Dealer is your only hope . Nothing you can do !
The theft deterrent control module produces the theft deterrent fuel and starter enable signal when ignition is ON and the proper transponder key value is detected. The powertrain control module (PCM) monitors the fuel and starter enable signal during crank. If the proper signal is present on the Class 2 Serial Data Circuit, the PCM enables the fuel delivery and starter operation in order to allow the engine to start. If the PCM detects an incorrect password, vehicle theft deterrent (VTD) system failure or attempted vehicle theft, DTC P1631 is set. The engine will not start or crank as long as the condition is present.

Sep 20, 2017 | Cadillac Cars & Trucks

1 Answer

2002 chevy venture security problem


Yea , what would you like to know ? How to bypass it , fix rthe right way ? What ? The normal thing to do would be to take it to a qualified repair shop that has the proper diagnostic tools to check for DTC'S if any are available .

DTC 006
DTC B2734
DTC B2960
DTC B3031
DTC B3055
DTC P1626
DTC P1630
DTC P1631

Replacing modules an trying to disconnect it doesn't work , It's made so the vehicle can't be stolen . Software programmed in the vehicle control modules .

Mar 15, 2017 | 2002 Chevrolet Venture

1 Answer

How can I fix my stabilitrak on my 2010 chev impala


What's wrong with it ? Need more info . Light on ? The first thing to do would be to have the vehicle checked for DTC'S - diagnostic trouble codes ! Get a diagnostic direction , not just replacing parts . Need a professional grade scan tool . Plus reading how stabilitrak works would also be a good Idea . StabiliTrak General Motors Stability Control

Vehicle Stability Enhancement System (VSES)
The vehicle stability enhancement system (VSES) adds an additional level of vehicle control to the electronic brake control module (EBCM).
Yaw rate is the rate of rotation about the vehicle's vertical axis. The lateral accelerometer measures the sideways acceleration of the vehicle. The VSES is activated when the EBCM determines that the desired yaw rate and lateral forces do not match the actual attitude of the vehicle.
The desired attitude of the vehicle are calculated from the following inputs:
• The position of the steering wheel
• The speed of the vehicle
• The lateral, or sideways acceleration of the vehicle
• Yaw rate of the vehicle
• Master cylinder brake pressure
The difference between the desired yaw rate and the actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM attempts to correct the vehicle's yaw motion by applying differential braking to the appropriate wheel. The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error.
The VSES activations generally occur during aggressive driving, in turns, or on poor road conditions, without much use of the accelerator pedal. When braking during VSES activation, the pedal pulsations feel different than the ABS pedal pulsations. The brake pedal pulsates at a higher frequency during VSES activation.

There a number of DTC'S that can set .
DTC C0035-C0050
DTC C0110
DTC C0131
DTC C0161
DTC C0179
DTC C0186
DTC C0196
DTC C0201
DTC C0242 or P0856
DTC C0245
DTC C0292
DTC C0558
DTC C0561
DTC C0563
DTC C0710

Do you know what DTC'S are , and a diagnostic flow chart ?

Feb 21, 2017 | Cars & Trucks

1 Answer

How do you put the resistor in the passlock system on a Oldsmobile Alero


You don't say if the security light is lit ? Is it ? If not , it's not a anti-theft system problem . An the passlock system on your vehicle the passlock sensor is part of the ignition lock cylinder . No resistor ! If the security light is lit you need to have it check for codes . There are a number of DTC'S that can set .
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1630
DTC P1631
DTC P1632

The Passlock™ system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. The body control module (BCM) provides security system sensor power and low reference for the Passlock™ sensor. The BCM also measures the security system sensor voltage.
When the correct key is used to start the vehicle, a magnet on the lock cylinder passes close to the Passlock™ sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock™ sensor which completes a circuit from the security sensor signal circuit through a resistor to the security sensor low reference circuit. The resistance value will vary from vehicle to vehicle. The BCM will measure the voltage on the security sensor signal circuit and compare this voltage to a previously learned voltage. If the voltage measured is within the valid range, the BCM will send a class 2 message to the powertrain control module (PCM) to enable vehicle starting. If the voltage measured is not within the valid range, a class 2 message will be sent to the PCM to disable starting of the vehicle.

Nov 04, 2016 | Oldsmobile Cars & Trucks

1 Answer

95 sl500 check engine light reset and comes back on after it sits over night. any idea?


What code is it throwing ? Some codes are what are called two trip codes ! You clear the codes an start an drive the vehicle ,no check engine light . Park the vehicle over night an bam next time you start an drive the vehicle the check engine light comes back on .

??There are two types of DTC's, 1 trip DTC's and 2

trip DTC's

??A 1 trip DTC is for a condition that requires

immediate attention such as a catalyst damaging

misfire.

??A 2 Trip DTC is one that a condition must be found

during 2 consecutive trips such as an EGR fault.

??Most Monitors do not set a DTC and light the MIL

when a vehicle fails a test for the first time during a

DRIVE CYCLE. If a test is failed on a second

consecutive DRIVE CYCLE the MIL will light and a

DTC is stored in the vehicles powertrain control
module (PCM).

Feb 07, 2016 | Cars & Trucks

1 Answer

My top does not work


Diagnostic Starting Point - Roof (Folding Top)
Begin the system diagnosis with the Diagnostic System Check - Vehicle in Vehicle DTC Information. The Vehicle System Check will provide the following information:
?€¢
The identification of the control modules which commands the system


?€¢
The ability of the control modules to communicate through the serial data circuit


?€¢
The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of Vehicle System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
Have vehicle scanned for DTC'S . The power roof has a number of DTC'S that can be set ,could make diagnosing easier !
DTC B1010 DTC B1296 DTC B1307 DTC B1325 DTC B1335 DTC B1345 DTC B1395 DTC B316A DTC B3602 DTC B3669 DTC B366A DTC B366B DTC B366C DTC B366D DTC B366E DTC B3674 DTC B3675 DTC B367A DTC B367B DTC B367F DTC B3680 DTC B3683 DTC B3685
There are a number of sensors for your convertible top !
DTC B1010 08: System Sensors Data Mismatch signal invalid
DTC B1010 08 sets when the folding top control (FTC) module detects a switch is not in the proper state when compared to other switches. The conditions that cause DTC B1010 08 to set may also set other Folding Top DTCs. The position and direction of the folding top when the fault occurs will determine whether DTC B1010 08 will set or another Folding Top DTC will set. If any Folding Top DTCs between DTC B1296-DTC B3685 are set, diagnose those DTCs first. After diagnosing any other Folding Top DTCs, clear DTCs and operate the Folding Top to see if DTC B1010 08 resets before diagnosing it.
DTC B1296 01: Movable Roof Header Unlatched Sensor Circuit short to battery

DTC B1296 06: Movable Roof Header Unlatched Sensor Circuit short to ground or open

DTC B1296 58: Movable Roof Header Unlatched Sensor Circuit incorrect reaction after event

DTC B1296 59: Movable Roof Header Unlatched Sensor Circuit circuit/component protection time out
You best bet is to take your vehicle to a ASE certified repair shop or to a GM dealer .
The f

Jan 14, 2016 | 2007 Pontiac G6 GT Convertible

1 Answer

My 05 Chevy 2500HD 6.0L won't start. I replaced the fuel pump before i realized the security light was on. I understand this to be an anti theft system. How can i dactivate it so my truck will start? I...


Do you have a second key ?
Passlock™ System
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the 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)/vehicle control module (VCM). The message enables the fuel injectors.
The design of the Passlock™ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the PASS-Key® system. However, the Passlock™ system eliminates the need for a key mounted resistor pellet. The components of the Passlock™ system are as follows:
• The ignition lock cylinder
• The ignition switch
• The Passlock™ sensor
• The BCM
• The security telltale
• The VCM/PCM

Your best bet , take it to a qualified repair shop . Security light on - DTC'S - diagnostic trouble codes are stored . Having codes check would point in a diagnostic procedure to fix the issue .

DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1631
Circuit Description
The Passlock™ system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. The body control module (BCM) provides security system sensor power and low reference for the Passlock™ sensor. The BCM also measures the security system sensor voltage.
When the correct key is used to start the vehicle, a magnet on the lock cylinder passes close to the Passlock™ sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock™ sensor which completes a circuit from the security sensor signal circuit through a resistor to the security sensor low reference circuit. The resistance value will vary from vehicle to vehicle. The BCM will measure the voltage on the security sensor signal circuit and compare this voltage to a previously learned voltage. If the voltage measured is within the valid range, the BCM will send a class 2 message to the powertrain control module (PCM) to enable vehicle starting. If the voltage measured is not within the valid range, a class 2 message will be sent to the PCM to disable starting of the vehicle.

Jan 31, 2018 | 1997 Chevrolet C2500

2 Answers

2002 grand am security system switch problems


This site shows a solution for $250, from a reliable manufacturer called newrockies. Your grand am is covered in their list of cars that their module works on.
website is called: vatspasslockpasskeysecurityhelp.com

Jan 03, 2018 | 2002 Pontiac Grand Am

1 Answer

DTC shows up on computer at auto zone as a bad code and i dont know what DTC means so i cant fix it if i dont know what it means so my question to you is what in the world does DTC mean ? Im working on a...


DTC stands for Diagnostic Trouble Code. My question is why did you have the vehicle checked out in the first place? Is the check engine light on? What was the code number and did it start with P0 or P1. If you don't remember then have the code(s) cleared and operate the vehicle until the code(s) reappear. The code or codes can help you to determine where to start looking.

May 14, 2011 | Chevrolet C3500 Cars & Trucks

1 Answer

2 problems...Service 4WD...(already replaced switch module!), and won't start with ~1/2 tank gas or less!


Do you know how to do scan tool diagnostic's ? Checking DTC'S - diagnostic trouble codes , viewing input data to the computers on the vehicle . The fuel sending unit is located inside the fuel tank ,it is a input to the PCM - engine computer . The PCM use's this fuel level info . to be able to conduct testing procedures for the evaporative emission system.
The Evaporative Emission Control System (EVAP) is used to prevent gasoline vapors from escaping into the atmosphere from the fuel tank and fuel system. The EVAP system usually requires no maintenance, but faults can turn on the Check Engine light and prevent a vehicle from passing an OBD II plug-in emissions test..
Shorted sensors can cause all kind of problems .including bring down the five volt reference circuit inside the PCM . Also checking for DTC'S in the 4X4 control module should have been done before replacing parts . Your best bet ,take it to a qualified repair shop.
Do you know which transfercase your vehicle has ?

The NVG 246 EAU transfer case features a 4 button shift control switch located on the instrument panel.
The BW 4482 transfer case features a 3-button shift control switch located on the instrument panel.
Just replacing parts is not the way to a fix . Both systems can set a number of DTC'S
DTC B0790
DTC B2725
DTC C0306
DTC C0327
DTC C0329
DTC C0359
DTC C0550
The NVG 246 EAU transfer case
DTC B0790
DTC B2725
DTC C0300
DTC C0305
DTC C0306
DTC C0321
DTC C0327
DTC C0359
DTC C0374
DTC C0379
DTC C0550

Do yourself a favor ,have a qualified repair shop diagnose the problem . An you can't just replace the 4X4 control module an expect it to work .It needs to be programmed .
Transfer Case Shift Control Module Reprogramming
Remote Programming Feature
Connect the scan tool to the vehicle.
Power-up the scan tool and select the Service Programming feature.
Select the appropriate vehicle.
Press the Request Info button on the scan tool.
Disconnect the scan tool from the vehicle and connect the scan tool to the computer station.
Follow the menu select items for reprogramming and provide information as to what type of device you are programming and whether you are reprogramming or replacing the electronic control unit (ECU).
Select "vehicle" from the selection menu.
Select the module you wish to Program.
Select "Normal" for Programming Type.
Select the applicable software calibrations.
Transfer data file to the scan tool.
Reconnect the scan tool to the vehicle.
Turn ON the ignition, with the engine OFF.
Select the Service Programming feature on the scan tool.
Press the Program button on the scan tool.

Jan 01, 2018 | 2003 Chevrolet Suburban 1500

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