2004 Dodge ram 1500 code AA code Ab and code AC.....replaced vss sensor fixed ground straps....tech at dealer said sounds like PCM.. looking for anything I missed to check

 

Make sure these fuses are good in the fuse box under the hood....

 

Checked the fuse box I have no PCM reading no and reading but runs and shifts perfect....too much electric driving me nuts

 

Your codes are c codes , I found the info below might help and use a DRBIIIt
scan tool

They are chassis codes. They are also referred to as a soft code.

The text “C Code” is displayed in the odometer
VFD for about three seconds. If there is no stored
fault information, the display will show two pairs of
zeroes in the format “00” “00”, which indicate that
the display of fault information is done. If there is
stored fault information, two sets of two-digit alpha
and alpha-numeric fault codes will appear in the
odometer display for a three second interval. The
first pair of digits represents a Diagnostic Trouble
Code (DTC), or fault code for the instrument cluster.
The second pair of digits is a counter for the number
of ignition key cycles that have occurred since the
displayed DTC was set. The instrument cluster will
continue to display additional sets of two pairs of digits
at three second intervals until all of the stored
codes have been displayed, which is again signaled
by a code of “00” “00”. Refer to the Instrument Cluster
Failure Message table for a description of each
fault code that the instrument cluster displays. If an
instrument cluster fault is displayed, use a DRBIIIt
scan tool to diagnose the problem. Refer to the appropriate
diagnostic information.

And... the codes...

INSTRUMENT CLUSTER FAILURE MESSAGE
Fault Code Description Correction
01 Airbag warning indicator output circuit shorted.
02 Airbag warning indicator output circuit open.
03 ABS indicator output circuit shorted.
04 ABS indicator output circuit open.
05 MIL indicator output circuit shorted.
06 MIL indicator output circuit open.
Fault Code Description Correction
07 Wait to start indicator circuit shorted.
08 Wait to start indicator circuit open.
0B BTSI output circuit shorted or open.
22 Headlamp switch input circuit shorted.
23 Headlamp switch input circuit open.
24 Turn hazard switch input circuit shorted.
25 Turn hazard swiitch inpot circuit open.
27 Courtesy/dome output circuit shorted or open.
28 Glovebox/map lamp output circuit shorted or open.
29 Cargo lamp output circuit shorted or open.
40 Wiper switch input circuit shorted.
41 Wiper switch input circuit open.
42 Wash/beam input circuit shorted.
60 Passenger door lock switch input circuit shorted.
61 Passenger door lock switch input circuit open.
62 Passenger door lock switch input circuit stuck.
63 Driver door lock switch input circuit shorted.
64 Driver door lock switch input circuit open.
65 Driver door lock switch input circuit stuck.
66 All door lock output circuit shorted to ground or voltage.
67 All door unlock output circuit shorted to ground or voltage.
68 Driver door unlock output circuit shorted to ground or voltage.
6C Driver cylinder lock switch input circuit shorted.
6E Driver cylinder lock switch input circuit stuck.
80 Incorrect odometer value found.
81 Remote radio switch input circuit high.
82 Remote radio switch stuck.
A0 Internal module FLASH memory checksum failure.

A1 Internal module bootloader failure.
A3 Battery voltage open.
A5 TCCM messages not received.
A7 VIN checksum error.
A8 VIN previously stored.
A9 PCI bus internal failure.
AA PCM messages not received.
AB TCM messages not received.
AC ABS messages not received.
AD FCM messages not received.
AE ACM messages not received.
AF SKIM messages not received.
B0 RKE fob batteries low.
B1 RKE module communication link.
00 Done All Diagnostic Trouble Codes (DTC) have been displayed.

 

I found the code list in another thread I was wondering if anyone had any ideas other than to start replacement of parts or if I should be looking for a ground wire or bad wire that would cause them. The truck starts and drives/shifts perfectly but eventually will kick engine light for vss and that has been replaced so I am looking for something I missed

 

Which code when engine light comes on ? There is a front wheel sensor ABS an one on rear end an a tranny speed sensor

 

Code is P0501 after driving.. sensor is new and good

 

Guess what is listed as one of the potential symptoms of that code.....

your vehicle's RPM limiter may be decreased

Imagine that. Can you read the PCM thinks it's getting from VSS??

 

Check for a broken/frayed wire leading to the vehicle speed sensor also question have you changed tires or anything lately ? As another possibility is because vehicle's PCM is not correctly configured for the actual tire size on the vehicle