Powertrain, generic · Computer and auxiliary outputs
P06D9 Sensor Reference Voltage F 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 and all its sensors report at once – unplug them one by one to find the culprit. P06D9 is the range/performance check of reference circuit F. No manufacturer document available to us uses this code; the description follows the other reference circuits. Ford checks circuits A–C this way (below 4.7 V or above 5.2 V, 0.5 s).
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 or components
Symptoms
- Check engine light
- Several sensor codes at once
- Reduced power or limp mode
- Possibly starting problems
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
References: law.cornell.edu, newtonnet.co.uk, gsi.ext.gm.com.