Powertrain, generic (extended)

P2B24 Hybrid/EV Electronics Coolant Temperature Sensor C Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Some electrified drivetrains measure the power electronics coolant at three points, for example ahead of the inverter, behind it and at the charger or DC/DC converter. P2B24 covers the third of these sensors, C, and reports a circuit fault the controller does not classify further. Which component sensor C watches is not standardised and varies by make. No manufacturer documents P2B24 publicly. NTN-SNR lists the code as an electrical fault in the sensor C circuit. CARB treats every input that serves the inverter's thermal management as a monitored component, so an open or shorted line has to be caught. More specific results for the same sensor are P2B26 (low) and P2B27 (high). With one of several readings missing, controllers usually carry on with the remaining sensors but may lower power limits.

Likely causes

Connector or wiring fault in the sensor C circuit
Failed sensor C element
Input stage of the evaluating module faulty

Symptoms

  • Stored fault code, possibly with a hybrid system message
  • Lower charging or drive power in hot conditions

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–400
Time0.5–2 h

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

Parts involved

hybrid electronics coolant temp sensor cwiring harnesshybrid control module

Related codes

P2B25P2B26P2B27P2B20P0CEE

References: law.cornell.edu, ntn-snr.com.