Question 1

What does P0641 mean?

Accepted Answer

P0641 - Sensor Reference Voltage A Circuit Open. The 5V reference voltage that powers multiple sensors has a fault.

Question 2

What are the symptoms of P0641?

Accepted Answer

Check engine light, Multiple sensor codes, Poor running, Possible no-start

Question 3

What causes P0641?

Accepted Answer

Short to ground in a sensor circuit, Failed sensor pulling down reference, PCM 5V reference failure

Question 4

How much does it cost to fix P0641?

Accepted Answer

Typical repair cost: $50-$1,000. The 5V reference powers TPS, MAP, and many other sensors. One shorted sensor can take down all sensors on that circuit. Unplug sensors one at a time to find which one is pulling down the reference.

P0641 — Sensor Reference Voltage A Circuit Open

Don't guess — diagnose P0641 the right way

Common symptoms of P0641

Common causes of P0641

Repair cost & difficulty

Vehicles commonly affected

Related trouble codes