Sensor Power Supply Circuit High Voltage
The P06B2 code indicates that the Engine Control Module (ECM) has detected a voltage higher than the specified range on the 5-volt reference circuit that powers various sensors (e.g., throttle position, crankshaft position, camshaft position, etc.). This is typically caused by a short to voltage in the wiring or a faulty sensor drawing excessive current, which can disrupt sensor readings and affect engine performance.
01. Most Common Causes
- Short to battery voltage in the 5V reference circuit
- Faulty sensor (e.g., throttle position sensor, crankshaft position sensor) causing internal short
- Damaged wiring or connector causing a short to power
- ECM internal failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine stalling or rough idle
- Poor acceleration or hesitation
- Other sensor-related codes may be present
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the 5V reference circuit wiring and connectors for damage, corrosion, or shorts.
Step 3: Disconnect sensors one by one while monitoring the 5V reference voltage with a multimeter to isolate the short.
Step 4: If voltage returns to normal after disconnecting a sensor, replace that sensor.
Step 5: If no sensor is at fault, repair the short in the wiring harness or replace the ECM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause erratic sensor readings leading to stalling or poor performance, which may be unsafe.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the ECM needs replacement.