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

P058B Battery Monitor Module Current Monitoring 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. P058B concerns current measurement. In the sensor variant the module itself reports implausible current; GM's eAssist and stop-start engines compare it with their own reference and set it at 22 A difference in 160 of 200 samples. GM bulletins for the 2014–16 Malibu and Impala name a ground ring lying on the sensor's shunt or a loose terminal – current then bypasses the shunt.

Likely causes

Ground ring touching the shunt or loose
Fretting corrosion in the sensor connector, loose ground splice
Battery sensor faulty
Retrofitted loads grounded directly at the negative post

Symptoms

  • Check engine light, often sporadic
  • Stop-start inactive
  • Wrong state of charge display or battery warning

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–300
Time0.2–1.5 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

P058AP058DP058CP0562P0563

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov, gm-techlink.com.