P2CAE

Code

Generic P — Powertrain

Charge Air Cooler Coolant Pump B Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 27 RU: 19

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Read and record freeze-frame and live data with a scan tool; note conditions when code set
Perform a visual inspection of pump B wiring harness and connectors for damage, corrosion, or loose pins
Inspect relevant fuses and relays for the pump circuit; replace if blown or faulty
Back-probe the pump connector and measure supply voltage and control signal while commanding pump ON with a scan tool
Measure voltage at the pump supply terminal with key ON and engine running; expect near battery voltage
Measure resistance/current draw of the pump motor; compare to vehicle specification or bench-test with direct fused 12 V supply

Battery/supply voltage at pump: approximately battery voltage (nominal 11–14 V) with key ON/engine running
Control/driver circuit behavior: toggles when pump is commanded on/off via scan tool (exact polarity varies by vehicle)
Expected pump current draw: varies by design (often around 1–6 A for small coolant pumps); compare to manufacturer spec
A low-voltage fault is triggered when the control circuit voltage is lower than the expected range or when current is abnormal during commanded operation
Record live-data values: commanded status, supply voltage, driver output voltage, and pump current while reproducing the fault

Retrieve DTCs, freeze-frame and live data. Note whether P2CAE is current or historical and any additional related codes.
Visually inspect pump B harness and connector for corrosion, bent pins, melted insulation, or water intrusion. Repair or replace damaged connectors.
Check fuses and relays for the intercooler coolant pump circuit; replace if defective.
With connector connected, command the pump ON using a scan tool and back-probe the supply and control pins. Verify supply is at battery voltage and control/driver changes state when commanded.
If supply voltage is present but pump does not run, measure pump current. If current is zero or out of range, disconnect pump and bench-test with a fused 12 V source to confirm pump operation.
If pump runs on bench test, measure resistance and continuity from pump connector to ECM; look for opens or shorts to ground/voltage. Repair harness as required.
If pump does not run on bench test, replace the pump assembly and retest.
If wiring and pump are good but control signal remains incorrect (short to ground, stuck low/high), back-probe the ECM/PCM driver pin and inspect for shorts. If confirmed, consider ECM repair/replacement only after all other possibilities are eliminated.
Clear codes and road-test to verify repair. Monitor live data for recurrence.