Question about 2002 Chevrolet Impala

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What is p0641 code on 05 impala

Causes to idle high and to over heat

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DTC P0641 The powertrain control module (PCM) provides a 5-volt reference to the following sensors:

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.

Posted on Aug 28, 2014

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SOURCE: 05 impala has a loud buzzing sound after changing

gotta be a big vacuum leak ,is the seal in there? tighten the bolts slowly,it's plastic .easy on the torque.

Posted on Apr 26, 2012

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I own a 2008 GMC Envoy Denali, 2WD. Yesterday the engine would barely idle and numerous lights on the dash came on including the check engine light. I had a friend check the diagnostic codes and it came up...


Five days prior to this, the battery had to be replaced. The engine was started without the pause for two minutes ?????? Where do you people come up with some of this stuff ? Pausing for two min. before starting has nothing to do with it . DTC P0651: 5-Volt Reference 2 Circuit
Some of the engine sensors on your vehicle work off of a steady 5 volt supply by the PCM - engine computer . One of these sensors is short internally bring down the PCM .
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Accelerator Pedal Position (APP) Sensor 1 5-Volt Reference 2 Circuit
P0651
P2122
P0651
--
Accelerator Pedal Position (APP) Sensor 2 5-Volt Reference 1 Circuit
P0641
P2127
P0641
--
Air Conditioning (A/C) Refrigerant Pressure Sensor 5-Volt Reference 1 Circuit
P0641
P0532
P0641
--
Camshaft Position (CMP) Sensor 5-Volt Reference 1 Circuit
P0641
P0340
P0641
--
Engine Oil Pressure (EOP) Sensor 5-Volt Reference 1 Circuit
P0641
P0522
P0641
--
Fuel Tank Pressure (FTP) Sensor 5-Volt Reference 1 Circuit
P0641
P0452
P0641
--
Manifold Absolute Pressure (MAP) Sensor 5-Volt Reference 1 Circuit
P0641
P0107
P0641
--
The Crankshaft Position (CKP) Sensor 5-Volt Reference 2 Circuit
P0651
P0335
P0651
--
Throttle Position (TP) Sensor 1 and 2 5-Volt Reference 2 Circuit
P0651
P0122, P0222
P0651

That's why it wasn't running good ,an lights lit on the dash. Your best bet , take it to GMC dealer .
No where in GM service info does it say after replacing the battery that you need to wait two min. before starting .
Position the positive battery cable (1) to the battery.
Tighten the positive battery cable bolt.
Tighten
Tighten the bolt to 15 N·m (11 lb ft).
Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

Aug 02, 2017 | GMC Cars & Trucks

1 Answer

2007 cobaltpo651 circuit b how do i trll which is circuit b


DTC P0651: 5-Volt Reference 2 Circuit First off do you know what computer reference voltage is ? Your vehicle has 2 reference voltage circuits . This reference voltage is used to power engine sensors .
Diagnostic Fault Information
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Accelerator Pedal Position (APP) Sensor 1 5-Volt Reference 2 Circuit
P0651
P2122
P0651
--
Accelerator Pedal Position (APP) Sensor 2 5-Volt Reference 1 Circuit
P0641
P2127
P0641
--
Air Conditioning (A/C) Refrigerant Pressure Sensor 5-Volt Reference 1 Circuit
P0641
P0532
P0641
--
Crankshaft Position Sensor 5-Volt Reference 2 Circuit
P0651
P0335
P0651
--
Fuel Tank Pressure (FTP) Sensor 5-Volt Reference 1 Circuit
P0641
P0452
P0641
--
Intake Camshaft Position Sensor 5-Volt Reference 1 Circuit
P0641
P0340
P0641
--
Manifold Absolute Pressure (MAP) Sensor 5-Volt Reference 1 Circuit
P0641
P0107
P0641
--
Secondary Air Injection (AIR) Solenoid 5-Volt Reference 2 Circuit
P0651, P2432
P2431
P0651, P2431
--
Throttle Position (TP) Sensor 1 5-Volt Reference 2 Circuit
P0651
P0122
P0651
--
Throttle Position (TP) Sensor 2 5-Volt Reference 2 Circuit
P0651
P0222
P0651
--

How to check the 5v reference circuit for short to ground Cadillac

Jun 10, 2017 | Cars & Trucks

2 Answers

My car keeps shutting off after i drive it but restarts fine


Try cleaning the throttle plate both front an back with a high quality carburetor cleaner ( berkbile 2+2 ) and the idle air control in the throttle body. If you are not mechanically savy you may want to take it to your mechanic.

Jun 20, 2014 | 2003 Chevrolet Impala

1 Answer

Idle too high


Sounds like your idle curb sensor is shot. Did you replace the shift sensor by any chance, this also could make the vehicle shift hard. Did you change the fluid and screen when the trans was replaced?

Mar 24, 2014 | 2005 Buick Rendezvous

1 Answer

Buick problems


code p0641 refers to sensor reference voltage A--circuit malfunction===causes---wiring short to positive.

Dec 28, 2013 | Cars & Trucks

1 Answer

2005 chevy impala holding high idle


A temp sensor out of range giving a false cold reading can cause high idle . A MAP sensor can also cause high idle by advancing the timing resulting in higher idle .

Oct 07, 2017 | 2000 Chevrolet Impala

1 Answer

2003 impala intermittent high idle with high iac count iac tested good


Before buying a ECM for the car I would do a smoke test on the vacuum line to be sure there is no leaks and causing the idle to very. Hope this helps.

Apr 17, 2017 | 2003 Chevrolet Impala

1 Answer

05 impala has a loud buzzing sound after changing the throttle body. High idle real rough.... Help me


gotta be a big vacuum leak ,is the seal in there? tighten the bolts slowly,it's plastic .easy on the torque.

Apr 26, 2012 | 2005 Chevrolet Impala

3 Answers

Code P0507


P0507-- idle speed high

Jun 02, 2008 | 2001 Chevrolet Impala

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