1999 Dodge Truck pcm

With key on
should have check engine light on and oil light too
if not
have to check fuses wiring harness
ignition switch
no bus message also is an indication of wiring issue

sample on no bus issue from 1999 dakota

NO BUS BIAS
NOTE:For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST VER-1 after each repair.

CAUTION:Always turn ignition off prior to disconnecting any module connector.

Remove and inspect fuse No. 11 from junction block. Junction block is on left side of instrument panel. If fuse is open, go to next step. If fuse is okay, go to step 4.
Turn ignition off. Using external ohmmeter, measure resistance between ground and fused ignition switch output run/start terminal (Dark Blue/White wire) on fuse No. 11 socket. If resistance is less than 5 ohms, repair Dark Blue/White wire for short to ground. Replace fuse No. 11. If resistance is 5 ohms or more, replace fuse No. 11.
Turn ignition on. Using an external voltmeter, measure voltage between ground and fuse No. 11 Dark Blue wire terminal. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open Dark Blue wire.
Disconnect scan tool. Turn ignition on. Using an external voltmeter, measure voltage between ground and DLC terminal No. 3 (Violet/Brown wire). If voltage is not 1.8-2.3 volts, go to step 6. If voltage is 1.8-2.3 volts, go to next step.
Measure voltage between ground and DLC terminal No. 11 (White/Black wire). If voltage is not 1.8-2.3 volts, go to next step. If voltage is 1.8-2.3 volts, replace scan tool cable or scan tool.
Connect jumper wire between ground and DLC connector terminal No. 11 (White/Black wire). Turn ignition off. Remove instrument cluster. Using external ohmmeter, measure resistance between ground and oil pressure gauge side instrument cluster connector terminal No. 9 (White/Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open White/Black wire.
Disconnect jumper wire. Measure resistance between ground and oil pressure gauge side instrument cluster connector terminal No. 9 (White/Black wire). If resistance is less than 1000 ohms, repair White/Black wire for short to ground. If resistance is 1000 ohms or more, go to next step.
Connect jumper wire between ground and DLC connector terminal No. 3 (White/Black wire). Measure resistance between ground and oil pressure gauge side instrument cluster connector terminal No. 10 (Violet/Brown wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open Violet/Brown wire.
Disconnect jumper wire. Measure resistance between ground and oil pressure gauge side instrument cluster connector terminal No. 10 (Violet/Brown wire). If resistance is less than 1000 ohms, repair Violet/Brown wire for short to ground. If resistance is 1000 ohms or more, go to next step.
Turn ignition on. Using external voltmeter, measure voltage between ground and oil pressure gauge side instrument cluster connector terminal No. 2 (Dark Blue/White wire). If voltage is 9.5 volts or less, repair open Dark Blue/White wire. If voltage is more than 9.5 volts, go to next step.
Turn ignition off. Using external ohmmeter, measure resistance between ground and oil pressure gauge side instrument cluster connector terminal No. 4 (Black/Tan wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open Black/Tan wire.
Measure resistance between ground and oil pressure gauge side instrument cluster connector terminal No. 5 (Black wire). If resistance is 5 ohms or less, replace instrument cluster. If resistance is more than 5 ohms, repair open Black wire.