Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P058A Battery Monitor Module Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The battery monitor module (intelligent battery sensor) sits on the negative terminal of the 12 V battery: a shunt measures current, electronics also measure voltage and temperature and calculate state of charge, health and cranking ability, reporting over LIN. Energy management uses the data for alternator control, idle boost and stop-start release, which is why the engine module diagnoses it. GM sets P058A–P058F in its engine modules from 2016 as type B, warning lamp after two trips. P058A means the module reports an internal fault of its own over LIN. GM checks it every 250 ms above 9 V, without LIN faults and at outside temperatures of −20 to 50 °C. Battery data are then unreliable – stop-start is blocked and the alternator usually runs a fixed substitute voltage. Loss of communication is a separate U code.

Likely causes

Battery sensor faulty internally
Poor supply or ground at the sensor (loose terminal, corroded connector)
Sensor not relearned after battery replacement or disconnection
Module or engine module software

Symptoms

  • Check engine light on
  • Stop-start not available
  • No driveability problems

Repair estimate

DifficultyEasyDIY possible
Parts and labour€60–250
Time0.3–1 h

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

Parts involved

battery monitor modulebattery terminallin busengine control module

Related codes

P058BP058CP058DP058EP058FP0562

References: gsi.ext.gm.com, gsi.ext.gm.com, techtips.ie, static.nhtsa.gov.