This code is a little harder to diagnose, need to do some testing first, no specific fault on this code, here is some info:DTC P0651: 5-Volt Reference 2 Circuit. The control module has 2 internal 5-volt reference busses called 5-volt reference 1 and 5-volt reference 2. Each reference bus provides 5-volt reference circuits for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to that reference bus. The control module monitors the voltage on the 5-volt reference busses.
The 5-volt reference 1 bus provides 5 volts to the following sensors:
" The exhaust gas recirculation (EGR) valve
" The manifold absolute pressure (MAP) sensor
" The fuel tank pressure (FTP) sensor
" The accelerator pedal position (APP) sensor 2
" The engine oil pressure (EOP) switch
" The air conditioning (A/C) refrigerant pressure sensor
" The camshaft position (CMP) sensor
The 5-volt reference 2 bus provides 5 volts to the following sensors:
" The APP sensor 1
" The throttle position (TP) sensor 1 and 2
" The crankshaft position (CKP) sensor
you have to check for a 5 volt reference circuits and ground. Do some testing first and post back or have it diagnosed, post back with what you find.
Thursday, July 2nd, 2009 AT 10:33 AM