Powertrain, generic (extended)

P2BE1 Hybrid/EV Battery Coolant Level Sensor Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2BE1 reports a battery coolant level signal that lies inside the electrical limits yet makes no sense, such as a value between the defined full and low states or one that flickers while the vehicle stands still. No manufacturer documents this code publicly. GM shows how such a check works on the Chevrolet Volt: its code P1FFB fails when the sensor voltage sits in a forbidden band of 2.85 to 3.11 V, 40 of 50 samples at 100 ms, Type A, while a genuine low level (1.38 to 2.84 V, judged only at standstill) has its own code. GM bulletin PI0961 adds cracked solder joints inside the sensor as a source of intermittent readings. CARB requires rationality checks for hybrid inputs. The pure circuit faults are P2BE0, P2BE2 and P2BE3.

Likely causes

Level sensor with internal fault, e.g. cracked solder joints
Intermittent contact in connector or jumper harness
Coolant level near the switching point or air in the loop
Evaluation software in the battery or hybrid controller

Symptoms

  • Hybrid system warning, often intermittent
  • MIL on
  • Coolant level looks correct at the reservoir

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–350
Time0.5–2 h

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

Parts involved

hv battery coolant level sensorwiring harnessbms

Related codes

P2BE0P2BE2P2BE3P2B28

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