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Check engine light is on and diagnatics show the error codes, P0722 and U2108


Definition of Diagnostic Trouble Code U2108 Buick: CAN Bus Error ABS Cadillac: CAN Bus Error ABS Chevrolet: CAN Bus Error ABS GMC: CAN Bus Error ABS Oldsmobile: CAN Bus Error ABS Pontiac: CAN Bus Error ABS Saturn: CAN Bus Error ABS


Definition of Diagnostic Trouble Code P0722 Category: Powertrain Definition: Output Speed Sensor Circuit No SignalNote: This definition of P0722 is applied to all manufacturers

Jun 27, 2015 | Cars & Trucks

1 Answer

How do i fix this p1687 code no mechanical instrument cluster bus message?


i guess you are working FSM free (no book) on this complex car?
the factory service manual tells you what the steps are.....
and what the codes mean, and what checks to do ....
fuses are first.
reseat modules 2nd. (related)
are those all DTC errors. or just 1. of many."?
using what scan tool. does your tool show all jeep codes.
like the Innova 3160 does.?? or is your tool 1/2 brain dead... as many are.
one code. answer.....s..
first lets try to understand this code. (DTC)
which engine? 4.0L or 4.7L?

this error , i think does not mean both key FOBS are dead
but did you try both... car came with both.????/
But....
it means the SKIM is not talking, (check all fuses with a voltmeter.
not just gandering at them......????) key on, test.
that be first. 12vdc on both sides of fuses, means they are really good.
it can also mean the Data buss is dead. PCI buss. its called.
The factory scan tool can see this data and we can see
if the data is Dead, or garbled or is never even sent.
you cant do that.... so...... its palm hits head moment.
if you had a real scan tool , and say lots of P1, P2, or other Jeep codes about PCI buss failure, i'd suspect that PCI has problems.
but if not, then just the SKIM is dead.
there are 7 computers on that buss. even the RADIO and BCM
if the bus has issues, the BCM will throw lots of errors.
Seems to me the SKIM is bad, or both keys bad.
i dont think this error is key related. but gee, you have 2, to try...
and takes 5min work....




No Cluster Bus Messages Print this code data Trouble Code Conditions:
Key on or engine running; and the PCM determined that it did not receive any Security Key Bus Messages over the Data Bus line for 20 seconds. This malfunction may be an intermittent problem.
Possible Causes:
  • Data Bus circuit from SKIM to PCM is damaged or it is open
  • PCM unable to communicate with the Body Control Module
  • PCM has failed, or the SKIM is damaged or has failed
that is all i know on this from DIY , perspective......

May 21, 2015 | 2001 Jeep Grand Cherokee

1 Answer

I have a 2002 toyota prius that will not start only code is p3030 what can I do to fix this I have cleard the code and as soon as I trun the key on it pops right back up


Error Code: P3030
Description: Disconnection between battery and ECU.

The battery ECU monitors a voltage of the battery blocks to detect an open malfunction in internal battery voltage sensor circuits of the battery ECU and the wire harness between each battery block and battery ECU. If a voltage at one of the battery blocks is below a standard level or of all the battery blocks is within a specified range, the battery ECU judges that there is an open in the internal sensor circuit(s) or wire harness. The battery ECU then illuminates the MIL and sets a DTC (Diagnostic Trouble Code).
Trouble Area:
- Junction Block Assembly (Bus Bar Module).
- Frame wire number 2, (Bus Bar and wire harness).
- Battery ECU.

Aug 09, 2014 | 2002 Toyota Prius

1 Answer

What does this codes u0073 means ?


communication failure on CAN-Bus.
take it to the shop.
as in all cases, electrical
check all fuses first.
reseat the connectors to the transmission.
FSM
Trouble Code: u0073 Control Module Communication Bus Off
Trouble Code Conditions:
TCM fails to transmit and receive the data via CAN for specified time continuously.
Possible Causes:
  • TCM
  • circuits
  • ECM

Apr 24, 2014 | 2008 Suzuki Forenza

1 Answer

What does the code 1686 mean for a jeep grand cherokee


you have dash lamps acting funny?
diesel engine? or gas, and what displacement? 4.0 , 4.7
P1686


did the immo lamp glow.
did you scan the PCM and see if 1685 (wrong key code)
1686, rigth out of fsm

Trouble Code: P1686 4.7L
No SKIM Bus Messages Received
Number of Trips to Set Code: 1
PCM details.
Trouble Code Conditions:
Engine started; and the PCM did not detect any MIC (I/P Cluster) messages over the Data Bus circuit for 20 seconds.
Possible Causes:
  • Data Bus circuit from MIC to the PCM is damaged or it is open
  • Instrument Cluster is damaged or has failed
  • PCM unable to communicate with the Instrument Cluster
  • PCM has failed
this means, the PCM can not talk to the I/P cluster puter.
comm fail.
even wilder guess is PCM talks to KEY via cluster so if cluster dead
so be key.
bad fuses ?

the FSm dont cover defeating any alrarms or IMMO less crooks read it. so...... google it.

Dec 29, 2013 | 1999 Jeep Grand Cherokee

1 Answer

Code u2100- u2105


U2100 - GM Type Network - Manufacturer Controlled DTC - Manufacturer Controlled Description CAN Bus Off (4L30-E Transmission) Conditions
Cause Key on and the TCM detected a loss of communication on either Communication Area Network (CAN) Bus line for one second

--------
U2103 - GM Type Network - Manufacturer Controlled DTC - Manufacturer Controlled Description CAN Bus Reset Counter Overrun (4L30-E Transmission)
Cause Key on and then the TCM detected a loss of communication on either CAN Bus line that exceeded 40 time out requirements


---------------
U2104 - GM Type Network - Manufacturer Controlled DTC - Manufacturer Controlled Description CAN Bus Reset Counter Overrun (4L30-E Transmission)
Cause Key on and then the TCM detected a loss of communication on either CAN Bus line that exceeded 40 time out requirements
------------------
U2105 - GM Type Network - Manufacturer Controlled DTC - Manufacturer Controlled Description CAN Bus Error ECM (4L30-E Transmission) Conditions
Cause Key on and the TCM did not receive ECM messages for 1 second

BUT, THERE IS NO FAULT CODES RESULT FOR U2101 AND U2102
or you can ask the 24 hrs live technical support was multi-diag, they will like to help you, good luck

Aug 14, 2013 | 2005 Isuzu Ascender

1 Answer

I have 2 pcs of RAM, 512MB and 1GB. then my pc has 4 slot. Can I install both 1GB and 512MB?


yes you can install it but issue is that . Is your computer supports the both bus peed first check the bus speed for checking bus speed you can see a steker on ram on that print will start form like

512. 400. its it speed is 512mb and buss speed is 400
if your 1gb ram is also 400 bus speed its mean it will run your computer smoothly.
if buss speed is change so you will face trouble. so please confirm the bus speed first thanks

Jul 16, 2011 | Computers & Internet

1 Answer

Having trouble with a 2005 cobalt. Sometimes car just goes crazy tranmission shifting weird codes are U2100,po700 and po742 think it is in the can bus but dont know were to start?


U codes are network codes - issues with communication between modules. Start there, as these can cause funky things to happen and can set P codes, as well. Once the U code is resolved, clear them all and see if they come back.

U2100:
"Key on and the TCM (transmission control module) detected a loss of communication on either Communication Area Network (CAN) Bus line for one second"

May 09, 2011 | Chevrolet Cobalt Cars & Trucks

2 Answers

Wont start my odometer blinks and says no bus


From the official Durango shop manual......(abbreviated)

Self Diagnosis Test

Vehicle key position is OFF ,or able to pull key out.
Hold in the trip odometer button (dont release yet)
Turn key to the ON position (one notch), but DON'T try to start the engine
Continue holding the trip button for about 10-12 seconds until CHEC appears in the odometer display
Release the trip button.
Series of three digit numeric failure codes may appear.
If no failure message appears, the self diagnostic test will proceed as described in step 6


Code Chart

110- cluster CPU,RAM,EEPROm failure, replace cluster

900-CCD data bus not operational, check CCD data bus connections at cluster, check the cluster fuses,check the CCD data bus bias, cehck the CCD data bus voltage, check the CCD data bus terminations.

920-cluster is not recieving a vehicle speed message from the PCM, check PCM software level and reflash if required, use the ($2500+) DRBIII scan tool to verify the vehicle speed message is being sent by the PCM

921-the cluster is not recieveing a distance pulse message from PCM,check PCM software level and reflash if required, use the ($2500+) DRBIII scan tool to verify the distance pulse message is being sent by the PCM

940-the cluster is not recieving an airbag lamp-on message from the ACM, check the CCD data bus connections at the ACM, check the ACM fuse.

950-cluster not recieving an ABS lamp-on message from the CAB, check CCD data bus connections at the ACM, check the ACM fuse.

960- clsuter not recieving a PRND21 message from the TCM, check the CCD data bus connections at the TCM, check the TCM fuse.

999-An error has been discovered, record the failure message, depress the trip odometer reset button to continue the Self-Diagnostic Test

Step 6
Instrument cluster will test each segment of the odometer (all first, then each one seperately)

Step 7
Bulb test

Step 8
Gauge test

Step 9
test completed

The instrument cluster will return to normal operation at the completion of test, if ignition switch turned off, or a vehicle speed message indicating movement recieved from the PCM on the CCD data bus.

Hope that help you or anyone else in future.

Aug 10, 2008 | 2000 Dodge Durango

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