Brief explanation of the P0641 code and definition of P0641 is the bottom side. Also, there must be a ground signal. I have a complete wiring diagram for the car and got some help from a friend with alldata. P0641 Chevrolet Description The control module has 2 internal 5-volt reference buses called 5-volt reference 1 and 5-volt reference 2. Here is what is crazy about that fuse. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus.
Repair or replace any damaged and burnt connectors and components. Refer to the vehicle information source to locate and understand the function of the sensor in question. He has a bulletin that lists my codes that says to start with this sensor and then reevaluate. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. Also mentioned the oil consumption so will be starting the oil consumption test as well. Make repairs or replace wiring as required.
Codes that follow P0641 will be stored as a result of P0641; codes that precede P0641 may have caused or contributed to P0641, and as such, these codes must be investigated and resolved before an attempt is made to diagnose P0641. Having a diagnostic route to go is your best bet. Be aware though that while on some applications this code will be stored on the first failure cycle, other applications may require several failure cycles before the code will set and a warning light is illuminated. When I unplug the coil packs it goes up to 5. These control modules may include but are not limited to the alternative fuel control module, the body control module, the antilock brake control module, the instrument panel control module, the fuel injection control module, the turbo control module, the anti-theft module, the cruise control module, the traction control module, proximity alert module, and the climate control module. Trouble Code Fault Location Probable Cause P0641 Sensor reference voltage A -circuit open Wiring short to positive We recommend What Does Code P0641 Mean? Check the sensor system related to the connectors and wiring harness.
Therefore, it is important to clear all codes after each repair step, and to operate the vehicle normally before rescanning to see if the code returns. Don't know if this will help. Truck is repaired and ready to go. Everything was going nuts from sensors to the gauge clustor. I haven't tapped any 5v wires so that's not it for me.
Unplug the connector and check 5V Ref pin 1 to ground not low ref. The solution is here : Chevrolet Malibu P0641 Possible Solution : The crankshaft sensor signals the fuel injection computer or the ignition control when the cylinders are firing. Also, this fault is usually associated with the drive train. The P0641 means the circuit is open. According to the wiring diagram there is a camshaft position sensor on the intake and the exhaust side. We are happy to hear that your vehicle issue is resolved and you are able to get back behind the wheel. I went to fire the car up and it went into safety mode.
I have a yellow top and the first one I had went out after only 6 months. It is the first one of two in that block. P0641 Meaning : p Powertrain Code Problem is related engine, transmission and emissions systems. A portable oscilloscope can be of help under certain circumstances. Even though it would start fine and register the correct voltage on the gauges. We did install an electric water pump so I will have to track the wiring for that.
Replace blown fuses with their exact equivalents, but bear in mind that while blown fuses most commonly result from short circuits, fuses do not always need a reason to blow. The 5v reading is intermittent. P0641 engine code provides below are generic codes that may not apply to all vehicles. I got my mm out and checked voltage at that fuse. Clear all codes after repairs are complete, before operating the vehicle and rescanning the system to see if the code returns. Maybe they will help you out. It ended up being a shorted battery.
Unfortunately he wants to throw parts at it too. If your spark plugs look good, problems with your ignition system can also preventing a spark. Long use can weaken a fuse to the point where it blows the next time current flows through it. Like the all engines, the car engine system employs specially developed hydraulic lifters known as switching roller followers for the P0641 code intake and exhaust valves. I ran into a similiar problem, but on my 06 1500hd. This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time. Fuses that may seem normal when there is a minimal load on the circuit often fail when the circuit is fully loaded.