Question about Cars & Trucks
Scanner says P0641 is a sensor "A" reference voltage open. Which sensor??? Or what am I missing here?
Posted by Anonymous on
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Posted on Jan 02, 2017
DTC P0641 The powertrain control module (PCM) provides a 5-volt reference to the
The throttle position (TP) sensor 1
The accelerator pedal position (APP) sensor 2
The engine cooling fan speed sensor
The AC pressure sensor
The fuel tank pressure (FTP) sensor
The oil pressure sensor (OPS)
The PCM monitors voltage on the 5-volt reference circuit. If the voltage is higher or lower than required, DTC P0641 will set.
Conditions for Setting the DTC
The PCM detects a voltage that is higher or lower than required on the 5-volt reference circuit. The above condition is present for 1 second. Action Taken When the DTC Sets The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
Conditions for Clearing the MIL/DTC The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. A current DTC, Last Test Failed, clears when the diagnostic runs and passes. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. Clear the MIL and the DTC with a scan tool.
Yes i can be dangerous, depending which issues mentioned above has triggered the code such as a faulty gas peddle position sensor. the code can also cause a reduced engine power to activate.
Thank you for using Fixya and best advice is to have the dealer address these issues. A tech 2 scanner would be needed to address the P0641 DTC code.
Posted on Mar 19, 2010
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SOURCE: i have a problem on
P0010 A Camshaft Position Actuator Circuit (Bank 1) P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem. P0164 02 Sensor Circuit High Voltage (Bank 2 Sensor 3) Replacing the O2 Sensor 3 usually takes care of the problem
Posted on Jun 30, 2011
po641 on a 09 g5 2.2 means that there is a problem with the 5 volt coming from the ecm the same 5 volts is sent to about 6 sensors you need to look at the 5 volt referance pid on a scan tool and disconect the sensors one by one till the referance volts comes to about 5 volts if that don't work then check the wires for a short to ground , usually ther are other codes in the memory to give you a hint
Posted on Feb 15, 2012
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