Powertrain, generic · Computer and auxiliary outputs

P06A7 Sensor Reference Voltage B Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

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

Symptoms

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

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

sensor reference voltage circuitsensor wiringengine control module

Related codes

P0651P0652P0653P06A6P0341

References: law.cornell.edu, newtonnet.co.uk, fordservicecontent.com, fordservicecontent.com.