Powertrain, generic · Computer and auxiliary outputs
P06D6 Sensor Reference Voltage F Circuit/Open
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. P06D6 is the general code for circuit F. No manufacturer document available to us uses this code; the description follows the other reference circuits. GM uses general collective codes for circuits 1–5 (4.875–5.125 V, first trip); a sixth circuit is not listed in the GM tables available to us.
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, gsi.ext.gm.com, newtonnet.co.uk.