Car throwing P0641 code - interpretation ??
Thread Starter
Intermediate
Joined: Aug 2005
Posts: 42
Likes: 0
From: Ouray Colorado
Car throwing P0641 code - interpretation ??
My car went into reduced engine power mode recently so I pulled codes and it had one, P0641. My code reader interpretted it as
"Sensor A reference Voltage Circuit/Open". Another list of codes indicates it means "5-Volt Reference 1 Circuit ECM". Does anyone know which sensor A is? or have any further information on this code.
Thanks in advance
"Sensor A reference Voltage Circuit/Open". Another list of codes indicates it means "5-Volt Reference 1 Circuit ECM". Does anyone know which sensor A is? or have any further information on this code.
Thanks in advance
Burning Brakes
Joined: Jul 2006
Posts: 849
Likes: 2
From: Southern Florida
That code is "5-Volt Reference 1 Circuit". That 5v circuit feeds the MAP, fuel tank press, AC press, APP2, oil press and cam sensors. If you don't have a wiring issue, then you probably have one of those sensors going bad and causing incorrect signals on that circuit.
Instructor
Joined: Jan 2006
Posts: 246
Likes: 4
From: Denton County Texas
If a reduced power message, SES light on, and a erratic oil pressure gauge reading has been duplicated and DTC P0641 is set, inspect the wiring harness behind the left cylinder head.
It is possible that circuit number 2705 (grey wire) which is the five volt reference circuit for the engine oil pressure switch to be chafed to the back of the left cylinder head.
It is possible that circuit number 2705 (grey wire) which is the five volt reference circuit for the engine oil pressure switch to be chafed to the back of the left cylinder head.
Pro
Joined: Sep 2012
Posts: 736
Likes: 22
From: Essexville MI
If a reduced power message, SES light on, and a erratic oil pressure gauge reading has been duplicated and DTC P0641 is set, inspect the wiring harness behind the left cylinder head.
It is possible that circuit number 2705 (grey wire) which is the five volt reference circuit for the engine oil pressure switch to be chafed to the back of the left cylinder head.
It is possible that circuit number 2705 (grey wire) which is the five volt reference circuit for the engine oil pressure switch to be chafed to the back of the left cylinder head.
