OBDII Codes

[quarky42]

Yeah looks like you found descriptions for the same codes I found.

Edit1: I found this via google:
"DTC’s C121A / C2205 - Steering Angle Sensor - Not Initialized / Internal"
HERE and HERE (it's a jeep, so the code may be similar, but ignore the TSB...okay?)

Edit2: Then I found what I think is the other one:
"C2100 Left Front TPM Sensor Malfunction"
(Uhm, ignore this, unless you really think your TPM could be malfunctioning.)

Edit3: then I found this:
"C2100 BATTERY VOLTAGE LOW" which I think is more likely than a TPM malfunction... (assuming you don't have Tire Pressure Monitoring?)
HERE
If you have the EVIC you can check the battery voltage while the car is off in the hidden menu. (press compass button first, then press music note and hold them both down)

If you have a volt meter (and IF you know how to use it to measure DC voltage) you can measure the voltage right at the battery. Don't let the dealer sell you a $100 battery that you can get at Checker Auto, Autozone, or Walmart for $50 or $60.

Looks like your car is falling apart. jk...sorry to hear about the problems.

[magnumman72]

I have a P0406 code How much will this cost to fix????

[Davesatdoasisbar]

I just got this pulling out of a parking lot. Hit the gas let up fast then hit it again. When I hit it the second time there was nothing as in nuetral. Slowed way down then it seemed to work fine. Car seems to run fine but the engine light is still on.
I am reading this as the light won't go eventually go away without the dealer??
I am getting heads and cam done Friday and don't want them to turn around and say its the result of the install.

Thanks

P0700 is a generic transmission code meaning that the TCM has detected a transmission malfunction. you'll need to get it scanned to retrieve the specific transmission DTC.

[quarky42]

Ouch. Ick. Sounds like you might need to let the installer (if it isn't yourself) know that the heads and cam might need to be pushed back a week depending on how quickly the dealer can resolve this transmission problem.

[fnkychkn]

2005 Magnum RT 71K miles.

Got a CEL light recently so I hooked up my Flashpaq to read the codes and I got these:

P0546 - EVAP Emission Control - Very small leak detected.
C121A - NO DESCRIPTION AVAILABLE
C2100 - NO DESCRIPTION AVAILABLE
B1668 - NO DESCRIPTION AVAILABLE
B1648 - NO DESCRIPTION AVAILABLE
B1644 - NO DESCRIPTION AVAILABLE
U0184 - Lost Communication with Radio

So the two with descriptions are pretty obvious. The ones with a B in front are BODY codes and I found info on these online.

B1668 Mirror Driver Right/Left Motor Stalled
B1648 Seat Driver Recline Forward Circuit Open
B1644 Mirror Passenger Right Circuit Open

But the C codes are nowhere to be found. I can only imagine that they are CHASSIS codes?


I'd like to be prepared before I take her in to the dealer to have them checked/fixed out of warranty.

Thanks.

sorry for the late reply. lost track of this thread.

1) P0456-EVAP PURGE SYSTEM SMALL LEAK
Theory of Operation

The theory behind the Natural Vacuum Leak Detection (NVLD) is adherence to the Ideal Gas Law. Pressure in a sealed vessel will change linearly as a function of the temperature of the gas in the vessel. Even small leaks will allow the pressure in the vessel to come to equilibrium with the atmospheric pressure. After key-off and a calibrated amount of time, cool down from operating temperatures or diurnal ambient temperature the system pressure will force the system to go negative or draw a vacuum if there is no leak. When the vacuum level reaches 1” H2O (0.25 KPA) the NVLD vacuum switch closes. This sends a signal to the NGC freezing a timer and registering a pass. If a switch closure is not detected an assessment of leak size will be made.

• When Monitored:

• Ignition off. Fuel Level less than 88%. Ambient Temperature between 4°C and 43°C (39°F and 109°F) Close Loop fuel system.
• Set Condition: Due to temperature changes, a vacuum is created in the fuel tank and EVAP system. With the EVAP system sealed, the PCM monitors the NVLD switch. If the NVLD switch does not close within a calibrated time allowance, an error is detected by the PCM. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes
EVAP PURGE SYSTEM LEAK
EVAP PURGE SOLENOID
NVLD SWITCH


2) C121A-STEERING ANGLE SENSOR NOT INITIALIZED

• When Monitored: With the ignition on.
• Set Condition: When the Anti-Lock Brake Module detects a low voltage at the Steering Angle Sensor or Steering Angle Sensor failure.

Possible Causes
TERMINAL/CONNECTOR/WIRING HARNESS DAMAGE
(A913) FUSED B(+) CIRCUIT OPEN
(Z910) GROUND CIRCUIT OPEN
STEERING CONTROL MODULE

this DTC can also be caused by a battery disconnect


3) C2100-BATTERY VOLTAGE LOW

• When Monitored: With the ignition on.
• Set Condition: When the Anti-Lock Brake Module indicates that voltage is below 7.5 volts.

Possible Causes
TERMINAL/CONNECTOR/WIRING HARNESS DAMAGE
STARTING AND CHARGING CONDITION
(A111) FUSED B(+) CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
(Z903) GROUND CIRCUIT OPEN
INTEGRATED POWER MODULE
ANTI-LOCK BRAKE MODULE

this DTC most likely caused by low battery voltage


4) B1668-REVERSE LAMP CONTROL CIRCUIT HIGH

• When Monitored:
• Continuously
• Set Condition:
• When the Front Control Module detects a short to battery on the Control circuit.

Possible Causes
(L1) BACKUP LAMPS CONTROL CIRCUIT
REVERSE LAMP
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE

this DTC most likely caused by a burnt bulb/disconnected circuit.


5) B1648-REAR RIGHT TURN CONTROL CIRCUIT HIGH

• When Monitored: Continuously
• Set Condition: When the Front Control Module detects a short to battery on the Control circuit.

Possible Causes
(L62) TURN SIGNAL CONTROL CIRCUIT
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE

this DTC most likely caused by a burnt bulb/disconnected circuit.



6) B1644-REAR LEFT TURN CONTROL CIRCUIT HIGH

• When Monitored: Continuously
• Set Condition: When the Front Control Module detects a short to battery on the Control circuit.

Possible Causes
(L63) TURN SIGNAL CONTROL CIRCUIT
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE

this DTC most likely caused by a burnt bulb/disconnected circuit.


7) U0184-LOST COMMUNICATION WITH RADIO

• When Monitored:
• With the ignition on
• Battery voltage between 10 and 16 volts
• IOD fuse installed
• FCM is configured correctly
• Set Condition: Bus messages not received from the Radio for approximately 2 to 5 seconds.

Possible Causes
CAN B BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
FCM NOT CONFIGURED CORRECTLY
RADIO
RADIO POWER AND GROUND
MODULE THAT SET THIS DTC

most common cause for this DTC is aftermarket radio.

[fnkychkn]

I have a P0406 code How much will this cost to fix????

P0406-EGR POSITION SENSOR CIRCUIT HIGH

• When Monitored: With the ignition on. Battery voltage greater than 10 volts.
• Set Condition: EGR position sensor signal is greater than 4.89. One trip Fault.

Possible Causes
(K34) EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO (F856) 5-VOLT SUPPLY CIRCUIT
(K34) EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K34) EGR POSITION SENSOR SIGNAL CIRCUIT OPEN
(K900) SENSOR GROUND CIRCUIT OPEN
EGR SOLENOID ASSEMBLY <<< most likely cause
PCM

cost to repair will depend on dealer and/or engine

[fnkychkn]

I just got this pulling out of a parking lot. Hit the gas let up fast then hit it again. When I hit it the second time there was nothing as in nuetral. Slowed way down then it seemed to work fine. Car seems to run fine but the engine light is still on.
I am reading this as the light won't go eventually go away without the dealer??
I am getting heads and cam done Friday and don't want them to turn around and say its the result of the install.

Thanks

you might be able to retrieve codes from TCM using SC flashpaq or diablo predator.

[Mr. Squiggles]

Anyone know what the U0101 code is? The Predator lists it as an "unknown". I did a search on this thread and it didn't find it either. Searched Google, no help.

Recent History:
Just got new tires, so I updated the tire size via the Predator. I also wanted to show Pops what the increased shift firmness difference is, so put regular shift firmness back in. And then I reset TCM adaptives.

Did all that via the Quick Adjustments, cyled the key as told, when I started the car the CEL stayed on. Checked the code via Predator and it gave the U0101.

Any help is greatly appreciated!

[stitchmonkey]

Mr.iNCREDIBLE can probably tell you? I couldn't find it either but looks like codes starting with U all seem to do with loss of communication with one part of the car or another? sorry. Good luck.

[fnkychkn]

Anyone know what the U0101 code is? The Predator lists it as an "unknown". I did a search on this thread and it didn't find it either. Searched Google, no help.

Recent History:
Just got new tires, so I updated the tire size via the Predator. I also wanted to show Pops what the increased shift firmness difference is, so put regular shift firmness back in. And then I reset TCM adaptives.

Did all that via the Quick Adjustments, cyled the key as told, when I started the car the CEL stayed on. Checked the code via Predator and it gave the U0101.

Any help is greatly appreciated!

U0101-LOST COMMUNICATION WITH TCM

• When Monitored: With the ignition on, battery voltage between 9 and 16 volts, and engine run time greater than 3 seconds.
• Set Condition: The PCM doesn't receive a bus message from the Transmission Control Module (TCM) for a specific amount of time.

Possible Causes
CAN C BUS OPEN OR SHORTED CONDITION
POWERTRAIN CONTROL MODULE (PCM)



assuming your predator didn't cause this, check for harness chafing at park brake actuator.

[rpg]

This is an amazing thread!

My 2005 Magnum Hemi AWD (only a few thousand miles on it) just failed the Massachusetts emission test when the service station connected the inspection computer to my OBD port. The computer said that the overall emissions and the oxygen sensors were 'not ready'. This is probably because the original owner of the car installed a very low restriction exhaust. When I drive around town the CEL will sometimes come on, and I have to remove fuse #14 with the engine running to extinguish the CEL. This doesn't happen if I drive on the highway, just when I'm poking around in traffic. The onboard computer must be storing this info in its memory. Is there any way to clear this fault code so i can get my inspection sticker?

Thanks for any help you can provide.

Richard

[Mr. Squiggles]

U0101-LOST COMMUNICATION WITH TCM

• When Monitored: With the ignition on, battery voltage between 9 and 16 volts, and engine run time greater than 3 seconds.
• Set Condition: The PCM doesn't receive a bus message from the Transmission Control Module (TCM) for a specific amount of time.

Possible Causes
CAN C BUS OPEN OR SHORTED CONDITION
POWERTRAIN CONTROL MODULE (PCM)



assuming your predator didn't cause this, check for harness chafing at park brake actuator.

Thanks fnky! I'll check by the parking brake for harness chafing. I did reset the TCM adaptives via the Predator. I wonder if HAL got grumpy and threw a hissy. It hasn't come back since I cleared it so I'll keep an eye on it.

Once again LXF comes through!!!! Ya'll rock, and ya rock hard!

[fnkychkn]

This is an amazing thread!

My 2005 Magnum Hemi AWD (only a few thousand miles on it) just failed the Massachusetts emission test when the service station connected the inspection computer to my OBD port. The computer said that the overall emissions and the oxygen sensors were 'not ready'. This is probably because the original owner of the car installed a very low restriction exhaust. When I drive around town the CEL will sometimes come on, and I have to remove fuse #14 with the engine running to extinguish the CEL. This doesn't happen if I drive on the highway, just when I'm poking around in traffic. The onboard computer must be storing this info in its memory. Is there any way to clear this fault code so i can get my inspection sticker?

Thanks for any help you can provide.

Richard

the reason it showed it was "not ready" for testing is because all monitors had not run and passed yet. every time you power down the PCM to erase the faults, you also erase all OBD2 monitor results and they need to run and pass again before it will be ready for testing.

btw, powering down the PCM while the engine is running is never a good idea. just pull fuse 11 for 15 seconds while key is in the OFF position.

high flow cats usually cause P0420/P0430 catalyst efficiency faults.

not sure how much success some have had by using spark plug anti-foulers to move the O2 sensors out of the exhaust stream.

to check if your vehicle is "ready for testing", turn key to run position. if MIL starts flashing after a few seconds, not all required monitors have run and it's not ready for emissions testing. if MIL stays on solid, you're good to go.

[jeffp]

I got a mil last week with a P0406. Did a scan and came up also with "Pending Codes" P0004 and P06E5 (I didn't even know it gave hex codes??). Have 60K miles on the 5.7L so I figure it's about right for the EGR to get a bit sticky. Reset the codes and didn't have a mil until about 400 miles later. Same P0406 on the EVIC and this and the others on the scan. Anyone know what the others may mean (I'm guessing they're related)? Also, any tricks on getting the EGR unit out (it's kinda well tucked behind stuff and not easy to get wrench at - I'd like to avoid having to pull the alternator and stuff if I can)? Thanks.

[fnkychkn]

couldn't find any reference to P0004 or P06E5. what are you using to scan it?