P06A7
Sensor Reference Voltage B Circuit Range/Performance
Sensor reference voltage
Generic OBD-II
High
What it means
P06A7 means the ECM's regulated reference-voltage B circuit (commonly the 5-volt supply shared by several sensors) is reading outside its expected range. Because many sensors depend on that reference, a fault here often sets multiple sensor codes and can make the engine run poorly or enter limp mode until the shorted circuit or sensor is found.
High
Can I keep driving? Often driveable, but expect a check-engine light and possibly rough running or limp mode, since several sensors may lose a stable reference voltage.
Common symptoms
What you'll notice
- Check-engine light on
- Multiple sensor codes set at the same time
- Rough running, hesitation, or reduced power
- Reduced-power or limp mode in some cases
Common causes
Most likely first
- Short to voltage or ground on the 5-volt reference B circuitLikely
- A shorted or failing sensor pulling the shared reference off valueCommon
- High-resistance, corroded, or loose connections on the reference circuitCommon
- Faulty ECM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Scan for companion sensor codes that share the reference B circuit.
- Inspect the reference wiring and connectors for shorts, opens, and corrosion.
- Disconnect sensors one at a time to find one that is dragging the reference voltage off value.
- Back-probe the reference at the ECM and compare against the sensors.
- If wiring and sensors are good, evaluate the ECM/PCM.
FAQ
Quick answers
Is it safe to drive with P06A7?+
Often short trips are okay, but because several sensors share this reference the engine may run poorly or drop into limp mode. Get it diagnosed soon.
Can I just clear P06A7?+
You can, but if a sensor or wire is shorting the reference it returns quickly, usually with other sensor codes; find the short instead.
Related codes
Often seen with P06A7
Read & clear P06A7 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX