- Aug 2, 2014
- 90
Hey Guys. Having a problem here this evening. 2002 Envoy SLT with about 140,000 m. My other vehicle (Wife's 2012 Acadia SLT) is broke (power steering pump leak) so I was heading out to pick her up from work. Cruising on the highway at about 65-70 mph when suddenly I heard 4 chimes and got a CEL and REP. Shut the Envoy down and restarted about 2 minutes later and the CEL was still on but REP was not lit and truck ran good, for about 2 minutes then same REP.
Limped home and checked codes. P1221, P1271 and P1635. Can these three codes be related? This truck has been running fine for the last few months after I changed out 2 coil packs and a new set of plugs. Any easy ideas I can check?
P1221- fuel pump secondary circuit low
P1271- Accelerator pedal position (APP) sensor 1-2 correlation
P1635- 5 volt reference circuit
Thank you.
Glenn
Limped home and checked codes. P1221, P1271 and P1635. Can these three codes be related? This truck has been running fine for the last few months after I changed out 2 coil packs and a new set of plugs. Any easy ideas I can check?
P1221- fuel pump secondary circuit low
P1271- Accelerator pedal position (APP) sensor 1-2 correlation
P1635- 5 volt reference circuit
Thank you.
Glenn