Sensor Reference Voltage Circuit High
The P06A5 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, manifold absolute pressure, fuel tank pressure). This can be caused by a short to battery voltage, a faulty sensor, or an internal ECM issue. The high voltage can disrupt sensor readings, leading to drivability problems.
01. Most Common Causes
- Short to battery voltage in the 5-volt reference circuit
- Faulty sensor (e.g., throttle position sensor, MAP sensor) causing internal short
- Damaged wiring or connector corrosion
- Faulty ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine stalling or rough idle
- Poor acceleration or hesitation
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and note freeze frame data.
Step 2: Visually inspect the 5-volt reference circuit wiring and connectors for damage or corrosion.
Step 3: Disconnect each sensor on the circuit one at a time while monitoring 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 faulty, check for a short to battery voltage in the wiring harness.
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. Have it diagnosed promptly.
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.