Powertrain, generic · Computer and auxiliary outputs

P06B2 Sensor Power Supply A Circuit High

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. P06B2 means supply A is too high: GM's 2008 Two-Mode hybrid flags above 18.0 V for 1042 ms, a 2016 GM hybrid control module above 18.6 V in 40 of 50 samples, each after two trips. Typical causes are a faulty internal regulator or overvoltage in the 12 V system. Mitsubishi's 2022 Outlander lists it as a sub-code.

Likely causes

Internal supply regulator of the motor control module faulty

Overvoltage in the 12 V system (DC/DC converter, charging)

Supply wire shorted to a higher voltage

Connector or wiring fault

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

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.