Powertrain, generic · Hybrid propulsion

P0A48 Drive Motor B Position Sensor Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0A48 reports a motor B resolver line reading above its allowed range, for example a sine, cosine or excitation wire shorted to a supply voltage, or an open coil whose line is pulled up by the input bias circuit until the converter clips. No manufacturer documents this code publicly. Mitsubishi handles high resolver voltages on the 2023 Outlander PHEV with its own codes (P0C53/P0C5D at 4.9 V or more on the front motor, P0C58/P0C62 on the rear), and Kia uses the motor A twin P0A42 on the Optima Hybrid. CARB 1968.2 requires circuit checks of electric drive components; Bosch patents describe detecting an open sine or cosine line and a short to supply. P0A47 is the low side. Expect a warning lamp and loss of motor B.

Likely causes

Resolver line shorted to a supply voltage

Open sine or cosine line pulled high by the input circuit

Corroded or loose terminals at the motor B resolver connector

Faulty resolver input stage in the motor control module

Symptoms

MIL and hybrid system warning
Second motor disabled, reduced traction or power
Vehicle may not enter ready mode

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€150–4,000

Time1–8 h

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

Parts involved

drive motor b position sensorwiring harnesshybrid control module

References: law.cornell.edu, mitsubishitechinfo.com, mitsubishitechinfo.com, patents.google.com.