Code Definition

P023B — Intercooler coolant pump Circuit low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P023B

P023B is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P023B is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P023B is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P023B fault code is set when the engine control module (ECM) detects a lower than expected voltage in the circuit of the intercooler coolant pump. This condition usually suggests an electrical issue such as a partial short to ground, reduced voltage supply, or problems within the pump itself leading to a decreased voltage. Low voltage in this circuit can impair the coolant pump's ability to circulate coolant effectively through the intercooler system, which is vital for maintaining appropriate engine temperatures, particularly in turbocharged engines.

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