Powertrain, generic · Computer and auxiliary outputs

P06B3 Sensor Power Supply B Circuit/Open

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

Despite the similar name, 'sensor power supply' is not the 5 V sensor reference (P0641 ff). It is documented in GM hybrid drive motor control modules: a 15 V supply that excites the motor position sensor (resolver) and powers the gate drivers of the inverter transistors, kept separate from the 5 V reference and the 12 V supply. In GM's 2008 Two-Mode hybrid, A and B are the two motor control modules. P06B3 is the general or open-circuit code of supply B, the second module. Only Mitsubishi's 2022 Outlander bulletin lists this code (as a main code with low/high sub-codes), without thresholds or sensor assignment. Low and high are P06B4/P06B5; check fuses and feeds of the second motor control module first.

Likely causes

Blown fuse or open feed to the module

Internal supply circuit of the motor control module faulty

Connector or wiring fault

Short in a supplied component

Symptoms

Check engine or hybrid warning light
Electric drive or hybrid mode limited or disabled
Further motor position or inverter codes

Repair estimate

DifficultyHardWorkshop job

Parts and labour€100–1,500

Time1–4 h

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

Parts involved

sensor power supply circuitdrive motor control moduleresolver

Related codes

P06B4 P06B5 P0651 P0652 P0653

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