What causes the p0641 trouble code on a GM car?

GM has identified the cause of the P0641 to be a chaffed wire in the ECM wiring harness. The chaffing occurs because the ECM wiring harness is rubbing on the ECM bracket. Using the image here, locate the wire harness bundle from connector X1 at the ECM.

How to diagnose and repair p0641 sensor reference voltage?

How to diagnose and repair P0641. 1 Perform a preliminary inspection. Sometimes P0641 can pop up intermittently. This is especially true if the code is a history code and not current. 2 Check the circuit. 3 Check the sensors. 4 Check the PCM.

How much does it cost to repair a p0641 Chevy?

Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. The cost of diagnosing the P0641 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

What does fault code p0641 mean in OBD II?

What Does Code P0641 Mean? OBD II fault code P0641 is a generic code that is defined as “Sensor reference voltage “A” -circuit open”, and is set when the PCM (Powertrain Control Module) detects an open circuit in the “A” reference voltage circuit.

What does PCM error code p0641 mean?

If this code is stored, this means the PCM programming error has occurred. This, of course, requires you to diagnose and repair other sensor codes before diagnosing and repairing Error Code P0641 – keep the open “A” circuit in mind.

What are the symptoms of sensor reference voltage p0641?

Common causes of code P0641 could include the following- Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors Unlike with most other codes, a defective PCM is a distinct possibility What are the symptoms of code P0641 ?

What does p0641 mean in reference voltage?

This usually takes the form of other codes that refer to a specific sensor or system, but note that this is not always the case. However, when code P0641 is present, whether other codes are shown or not, it always means that an open circuit exists in reference voltage circuit “A”.

What causes p0641 Chevrolet 5 volt to go off?

P0641 CHEVROLET Possible Causes 1 Faulty Engine Control Module (ECM) 2 ECM harness is open or shorted 3 ECM circuit poor electrical connection 4 Shorted sensor on 5 volt circuit More

Why are codes stored as a result of p0641?

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.

How can you tell if your throttle position sensor is bad?

The most common symptom is your check engine light. This indicator is a vague symptom, as it could also point to a variety of issues, but you can expect to see it if there’s any issue with your throttle position sensor. Next, any unusual changes in your acceleration could be linked to this sensor.

What are the symptoms of a bad throttle / accelerator pedal?

Symptoms of a Bad or Failing Throttle/Accelerator Pedal Position Sensor. $79.99 – $89.99. Average rating from 4,829 customers who received a Check Engine Light is on Inspection. The days of having to constantly adjust the throttle cable due to a loose nut on the carburetor are long gone.

What are the signs of a bad pedal position sensor?

Common signs of a faulty pedal position sensor include inconsistent engine response, reduced fuel efficiency, and the Check Engine Light coming on. 1. Engine response is inconsistent 2. Engine does not run efficiently 3. Check Engine Light comes on Average rating from 129,472 customers who received a Vehicle Engine Electrical Inspection.