Sensor Power Supply Circuit Open
The P06B3 code indicates an open circuit in the sensor power supply, meaning the 5V reference voltage from the PCM to one or more sensors is interrupted. This can affect multiple sensors (e.g., throttle position, MAP, fuel pressure) sharing the same reference circuit, leading to drivability issues.
01. Most Common Causes
- Open circuit in the 5V reference wire due to damage or corrosion
- Faulty PCM (rare)
- Short to ground or voltage in the reference circuit
- Loose or corroded connector at a sensor or PCM
02. Symptoms You Will Notice
- Check Engine Light on
- Engine stalling or rough idle
- Poor acceleration or hesitation
- Multiple sensor-related codes stored
03. Step-by-Step Diagnosis
Step 1: Scan for all codes and note which sensors share the 5V reference circuit.
Step 2: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Use a multimeter to check for 5V at each sensor connector with key on engine off.
Step 4: If no voltage, isolate the circuit by disconnecting sensors one by one to find the short or open.
Step 5: Repair or replace damaged wiring, connectors, or the PCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as it can cause stalling, poor performance, and potential damage to the catalytic converter or engine.
How much does it cost to fix?▼
Typically $50-$150 for wiring repair or connector replacement; PCM replacement can cost $500-$1000.