P06A7: Sensor Reference Voltage B Circuit Range/Performance

The engine module feeds sensors from several regulated 5 V reference circuits; a short at one sensor pulls the whole circuit down, so all its sensors report at once – unplug them one by one to find the culprit. P06A7 is the range/performance check of reference circuit B, without separate low and high. Ford reports reference B faults this way instead of P0652/P0653: petrol engines below 4.7 V or above 5.2 V for 0.5 s, the 2023 diesel below 4.7 V or above 5.3 V for 5 s, where supply 2 feeds the camshaft sensor. Camshaft sensor codes, starting problems or reduced power can follow. GM uses the collective code P0651 for circuit B.

Symptoms

• Check engine light
• Camshaft sensor codes as well
• Starting problems or reduced power

Most likely causes

• Short in the wire or sensor of a connected sensor
• Chafing or water in harness or connector
• A connected sensor faulty internally
• Module internal voltage regulator

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the battery and grounds
2. Compare the reading with other engine data while varying the engine speed.
3. Clear the code and see if it returns
4. If it is a reference voltage code, disconnect sensors one at a time and see if the voltage recovers
5. Check whether a software update is available
6. Do not replace the control module without a full diagnosis

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P06A7 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 6: Control modules and outputs
• A7: Specific fault in that system

Frequently asked questions

Can I keep driving with code P06A7?

It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.

What causes code P06A7?

The most common causes are: short in the wire or sensor of a connected sensor; chafing or water in harness or connector; a connected sensor faulty internally.

Related codes

• P0651Sensor Reference Voltage B Circuit/Open
• P0652Sensor Reference Voltage B Circuit Low
• P0653Sensor Reference Voltage B Circuit High
• P06A6Sensor Reference Voltage A Circuit Range/Performance
• P0341Camshaft Position Sensor A Circuit Range/Performance Bank 1 or Single Sensor

Sources

• law.cornell.edu: 13 CCR 1968.2
• newtonnet.co.uk: fordobd2012
• fordservicecontent.com: OBD Operations Summary Gasoline 2020 2023
• fordservicecontent.com: obd summary diesel 2023

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.