Powertrain, generic · Computer and auxiliary outputs

P06B1 Sensor Power Supply A Circuit Low

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. P06B1 means supply A is too low: GM's 2008 Two-Mode hybrid flags below 12.0 V for 365 ms, a 2016 GM hybrid control module below 8.8 V in 40 of 50 samples or 0.3 s continuously, each after two trips. An NHTSA review of the 2013 GM eAssist found P06B1 after blown 175 A and 7.5 A fuses – the cause is often on the supply side. Mitsubishi's 2022 Outlander lists it as a sub-code.

Likely causes

Blown supply fuse (e.g. 175 A or 7.5 A at GM eAssist)

Supplied component or wire shorted to ground

Internal supply circuit of the motor control module faulty

Low 12 V system voltage

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€50–1,500

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.