Question about 2008 Dodge Grand Caravan

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When i go to start my vehicle it reads bad key

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  • Dodge Master
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This sounds like the key may be bad, try a spare key and if message doesnt appear then key is bad, if message returns with spare key then you may need programing of the body module. most of the time its just a worn key chip.

Posted on Jul 09, 2010

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Posted on Jan 02, 2017

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Where is the starter relay on a 1997 camaro located?


Your Vehicle Has Pass Key 2 Anti Theft System--There Is A Theft Deterrent Relay That Activates Starter (under right side of dash) Most Times Problem Is Found Either In Key--No Or Bad Chip In Key--Or 1 or Both Grey Wires Going To Key Switch Broken Inside Insulation. Check That Someone Has Not Had New Key Made--Non OEM Keys Won't Work--If Not Sure, Take Key To GM Dealer And They Have Key Code Checker. The Only Place To Get New Key Is From Dealer--They Check Code On Old Key And Order One With Same Code-Then Cut To Fit Your Vehicle--When Key Is Inserted Into Switch Signal from Chip Is Sent To Body Control Module Through Small Grey Wires Allowing Relay Activation.
NOTE: If Key Does Not Read And You Don't Have Original One New OEM Key Has To Be Ordered Along with Replacement Body Control Module--They Can Only Be Key Code Programmed ONCE. If Key Checks Out OK --Check 2 Little Grey Wires Going To Key Switch For Breaks--Usually Breaks Inside Insulation--Making It Hard To See--The 2 Wires Flex Every Time Key Switch Is Rotated ---Now Relay Check--4 Wires--1 Yellow--1 Brown 1
Black/Yellow-1 Purple--- Yellow From Key Switch Hot In Start Mode-Brown-Hot In Start Mode (comes Through range switch in console or clutch switch---Black/Yellow To BCM (Relay Ground) Purple To Starter Solinoid When Relay Activated. Now That We Have Covered The Hard Things Let's Start With Basics--Momentarily Bridge Battery Wire To Purple Wire At Starter Solinoid --Starter Should Turn--IF IT DOES NOT--Bad Starter--Bad Starter Solinoid--Or Bad Battery Connections--Or Bad Battery (internal burnt strap)
25650900-0p0fad4n3jdf1nxnucgepkxn-1-0.jpg Save Picture For Reference

Apr 17, 2015 | 1997 Chevrolet Camaro

1 Answer

I have a Cadillac deville 1998 v8 northstar. I had my alternator rebuilt and got a new battery. Vehicle started once but dash read battery not charging. Took vehicle to O'Riellys Battery tested bad. H


When you replaced battery you activated the system. Need to read owner manual and see if it tells how to deactivate it. You may need to contact dealer to deactivate it.

Jun 04, 2017 | Cars & Trucks

1 Answer

Theft security problem


Usually it means the computer is not accepting the chip in your key.
It can be the key, the sensor in the lock cylinder, or something in the security module or computer.
You might try another key or lock and unlock the driver's door with the key.

Jul 27, 2013 | 1998 Cadillac DeVille

1 Answer

My f-450 2008 diesel has a continued problem.. signal work with out key and flasher unit stay on continuous while key off.


PATS Transceiver
The PATS transceiver is located under the steering column shroud and communicates with the PATS ignition key. During each vehicle start sequence, the PATS transceiver reads the PATS ignition key identification code and sends data to the IC. The IC validates the code, and if it is the correct code, will send a message to the PCM to ground the starter relay solenoid coil and to also allow the fuel injectors to operate.
PATS Operation
NOTE: If the IC or the PCM is being replaced (or both), the parameters must be reset in both modules or the vehicle will experience a PATS no-start. This will occur even if the vehicle is not equipped with PATS. PATS vehicles and non-PATS vehicles have parameters in the IC and the PCM and they must be reset whenever either (or both) module(s) is (are) replaced. Refer to Passive Anti-Theft System (PATS) Parameter Reset in this section.
The PATS function is controlled by the IC. When the PATS key is turned to the ON or START position, the IC initiates the key interrogation sequence by sending a voltage signal to the PATS transceiver. The transceiver then uses its antenna to bounce a signal off the transponder in the PATS key. This process "reads" the PATS key identification code and sends the key identification code back to the IC, which interprets it and determines if it matches one of the stored key codes. If it does match one of the stored key codes, the IC will send a message to the PCM to ground the starter relay solenoid coil and to also allow the fuel injectors to operate. If it does not match one of the stored key codes, or it is only a partial key read or no key read, the IC will send a message to the PCM to not ground the starter relay solenoid coil and not allow fuel injector operation. The anti-theft indicator in the IC will flash (or may glow steadily) and the IC will store one or more DTCs. All elements of PATS must be functional before the vehicle will start. If any of the components are not working correctly, the vehicle will not start. If the IC must be replaced for any reason (PATS concerns or IC concerns), the PATS keys must also be programmed into the new IC. Refer to Key Programming Using Diagnostic Equipment in this section.
PATS disables the vehicle from starting if there is:
  • a damaged PATS key.
  • a non-programmed PATS key.
  • a non-PATS key (key has no electronics).
  • damaged wiring.
  • a damaged transceiver.
  • a damaged IC.
  • failed parameters between the IC and the PCM.
PATS Parameter Identification (PIDs)
Monitoring the PATS PIDs in the IC can be very useful in determining which diagnostic steps to follow. Viewing the MASTERKEY (verifies if the key is programmed) PID (with both keys) will determine if the key is a programmed key and will also prove out the transceiver, circuitry and the IC. A master key is any key that is programmed into the IC (the MASTERKEY PID must display PRESNT). If the MASTERKEY PID reads NOTPREST, it may mean the key in the ignition lock cylinder is not programmed, is not a PATS key, is damaged or the transceiver, circuitry or IC may be at fault.
Viewing the MIN_KEY (minimum number of keys) PID (this PID does not change) indicates the minimum number of keys that must be programmed into the IC. There must be at least 2 keys programmed into the IC in this type of PATS before the vehicle will start.
Viewing the N_KEYCODE (number of keys programmed) PID will determines if the minimum number of keys have been programmed into the IC. If the N_KEYCODE PID reads 0 or 1, additional key(s) will need to be programmed into the IC in order to meet the minimum of 2 keys. If the N_KEYCODE PID reads 0 or 1, and the MASTERKEY PID reads NOTPREST, that particular key must be programmed into the IC. If the N_KEYCODE PID reads 1, and the MASTERKEY PID reads PRESNT, that particular key is already programmed into the IC.
If the IC was replaced, the parameters in the IC, then the parameters in the PCM will need to be reset. When the parameters in the IC are reset, that clears (erases) the PCM ID from the IC. A parameter reset of the PCM will send a PCM ID to the IC that is necessary for the system to operate. Make sure to make 3-5 attempts to start the vehicle for 3-5 seconds each before attempting more procedures. The extra key cycles are necessary for the PCM ID to be sent (by the PCM) and then stored by the IC. If only a PCM parameter reset occurs, the IC may encounter 2 PCM IDs (the original one and the new one) and may cause a PATS-related no-start. If a PCM parameter reset occurs first, then the IC parameter reset occurs, there will be no PCM ID stored in the IC, and a PATS-related no-start may occur. Carry out the IC parameter reset first, then the PCM parameter reset next. If the PCMID PID reads STORED, the IC has a PCM ID stored. If it reads NOTSTRD, a parameter reset of the PCM may resolve this issue. If the PCMID PID reads STORED, the PCMVER (the PCM ID has been verified) PID will read YES.
If the PATSENABL PID reads DISABLE, and the N_KEYCODE PID reads 2 or more and the MASTERKEY PID reads PRESNT, the IC and the PCM will need to have their parameters reset.
If the PATSENABL PID reads DISABLE, and the N_KEYCODE PID reads 1 and the MASTERKEY PID reads PRESNT, or if the N_KEYCODE PID reads 0 and the MASTERKEY PID reads NOTPRESNT, a minimum of 2 keys will need to be programmed into the IC. Refer to Key Programming Using Diagnostic Equipment in this section.
If the MASTERKEY continues to read NOTPRESNT after programming, this may indicate a defective key. The SPAREKEY (spare key) PID is defaulted to ENABLE. With the SPAREKEY PID displaying ENABLE, the IC will accept more than 2 keys (up to a maximum of 8) being programmed into the IC. Refer to Key Programming Using Two Programmed Keys in this section. It can be toggled to DISABL if the customer does not want any more than 2 keys programmed into the IC. Refer to Key Programming Switch State Control in this section. This switch state control does not affect the Key Programming Using Diagnostic Equipment procedure.
In summary for the IC PATS PIDs and their correct state in order for the vehicle to start:
  • N_KEYCODE must read 2 or more
  • MASTERKEY must read PRESNT
  • PCMID must read STORED
  • PATSENABL must read ENABLE
  • PCMVER must read YES

Aug 24, 2011 | 2008 Ford F 450 Super Duty

2 Answers

2003 Chevy Impala 78,000 miles KEY WILL NOT TURN. - Car was running fine! - Turned off key. - Tried to restart and Key will Not Turn. It was jammed in the OFF position. - I removed ignition...


ur still in a security lock out with ignition[ key ] system u might have to have it towed to dealer for them to hook up vehicle[contact dealer and advise what is happening and also recheck new key] for reprograming or reset system..some vehicles if u try to start vehicle while in a security mode can get completely locked out of vehicle and if u replaced the whole ignition housing and not just the cylinder the housing is the reader the wiring that is around the housing cylinder tube is what reads the key and syncs with the vehicle if u put in a different one or the wiring is damaged vehicle wont start and will stay in security mode

Jul 02, 2011 | 2003 Chevrolet Impala

1 Answer

2006 MERCEDES BENZ SL500 wont start. The panel reads : "key no detected'


Do you have a spare key to try?
This could be a bad key transponder - or a faulty reader in the vehicle.
If a second key yields the same results - the vehicle must be serviced.

Thanks!!!!

Aug 26, 2010 | 1993 Mercedes-Benz Mercedes Benz Sl Class

2 Answers

When it starts .. it won't stay started.


ENGINE NOT STAY RUNNING.COULD BE STOPPED UP FUEL FILTER BAD FUEL AND .FAULTY OR INCORRECT GAP PLUGS.ALSO BAD SPARK PLUG WIRES.FAULTY IGNITION SYSTEM.USE A DIAGNOSTIC SCANNER TO CHECK IDLE SPEED CODES AND MASS AIR FLOW SENSOR PROBLEMS.

Oct 16, 2009 | 2005 Chevrolet Malibu

1 Answer

98 GMC Safari has power but won't start


Have you checked battery voltage? (12v or better)
Check voltage at main starter cable (should be almost same reading, but not substantially lower (11.8 ok) Then check power to small terminal on starter...with key turned to "start" it should have 12v. If you have these readings and block ground is clean and secure, it's likely that starter has failed. If no power to small wire, either ignition switch or a relay is bad.(on stick vehicles add clutch switch) You can jump starter across large & small terminals and this will generally get it started. Do this with key "on" and vehicle in park (neutral on stick shift with brake on)

Mar 11, 2009 | 1998 GMC Safari

1 Answer

Security light is on, wont start


check the actual power battery cable make sure it clean from acid and that there is no frags on it
make sure all lines have tight connection
bad starter is the reason you have a light comen on it probably lodged its self in the starter plate teeth
make sure that its not a coded key
if coded key make that wiring has not come loose so that vehicle can read key
these are basics but would like a little more info on what happened before the vehicle didnt start
like does it turn over things like this

May 31, 2008 | 1999 Chevrolet 3500

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