Powertrain, generic · Computer and auxiliary outputs

P06D3 Sensor Reference Voltage E Circuit Low

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. P06D3 means reference E is too low – typically a short to ground. Ram's 2023 6.7 L Cummins set P06D3 together with P0642/P0652 because of a leaking capacitor in the engine module; the fix was replacing the module. GM reports circuit E under the collective code P06D2.

Likely causes

Short in the wire or sensor of a connected sensor
Chafing or water in harness or connector
A connected sensor faulty internally
Engine module internal fault (e.g. leaking capacitor, Ram 2023)

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

P06D2P06D4P06D5P0642P0652P06D7

References: law.cornell.edu, static.nhtsa.gov.