05 - Gauge Assembly Can't Receive Signals From Multiplex & ECM
05 - the Gauge Assembly Can't Receive Signals From Multiplex Control Unit and the ECM/PCMDTC 5 only (no other DTCs present):
Substitute a known-good gauge assembly, and recheck for the DTC.
DTC 2 and 5 simultaneously:
Check for an open in the YEL wire between multiplex control unit terminal E10 and ECM/PCM terminal E24.
If the wire is OK, substitute a known-good multiplex control unit, gauge assembly, and ECM/PCM one at a time, in that order, and recheck for the DTCs after each substitution.
Reprogram the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.