U05AA

Code

Generic U — Network/User

Invalid Data Received From Charge Air Cooler Coolant Pump

Brand: Generic

Type: U — Network/User

Views: UK: 29 EN: 78 RU: 31

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open, shorted or intermittent wiring/connectors between pump and control module or CAN bus
Failed or limited-function charge air cooler coolant pump
Blown fuse or faulty relay powering the pump
Corroded or damaged pump connector or ground
Controller (ECM/BCM) communication error or software fault
Low battery or supply voltage causing data corruption

Symptoms

Malfunction Indicator Lamp (MIL) or warning message related to charge air cooler
Reduced turbo/boost control performance or limp mode in some vehicles
Intermittent or no operation of the intercooler coolant pump
Elevated charge-air or intake-air temperatures under load
Stored U-codes or related P/U codes for pump or communication faults

What to check

Read and record all active/pending/confirmed codes and freeze-frame data
Check battery voltage and charging system condition
Visual inspection of pump, harness, connector, fuses, and relay
Scan tool: view live data for pump status, commanded duty cycle, pump current, and related temperatures
Verify CAN bus network health (bus voltage, termination, error counters) if available
Backprobe pump connector for supply voltage, ground continuity, control signal (PWM) while commanding pump

Signal parameters

Supply voltage to pump (typically battery voltage; 12 V nominal)
Control signal type: PWM duty cycle (%) or ON/OFF command
Pump current draw (amps) during operation
Reported pump status/feedback value from control module (if applicable)
CAN bus message presence and integrity (message ID and data bytes)
Charge-air cooler coolant temperature and intake-air temperature values

Diagnostic algorithm

Retrieve all codes and freeze-frame; save logs of live data for pump commands and temperatures.
Verify battery voltage (engine off and running). Low or unstable supply can corrupt data or disable pump.
Inspect pump connector and wiring for corrosion, damage, or water entry; repair or replace damaged connectors.
Check fuses and relays for the pump circuit; replace if blown or intermittent. Verify relay operation when pump is commanded.
With a scan tool, command the pump on/off and observe feedback. If the module reports invalid data while the pump responds correctly, suspect network/module/software.
Backprobe the pump connector while commanding pump: confirm battery supply present, control signal (PWM or switched ground), and good ground. Measure pump current while operating.
If no supply or signal, trace wiring for open/short to the controlling module. Perform continuity and resistance checks to module and ground points.
If wiring and supply are good but pump does not operate or draws excessive/zero current, remove and bench-test the pump by applying correct voltage and observing operation and current draw.
If pump and wiring test good, check CAN bus health and other controllers for bus errors. Consider swapping or reprogramming the module if intermittent or corrupted messages persist.
Repair or replace faulty components (connector, harness section, fuse/relay, pump, or module) as determined by tests. Clear codes and perform road/test cycle to confirm repair and that no invalid-data faults return.
If suspecting software bug, check for Technical Service Bulletins (TSBs) and perform module reflash/update per manufacturer procedures before replacing major components.

Likely causes

Water intrusion/corrosion at the pump connector causing intermittent signals
Pump motor seized or high internal resistance producing abnormal current draw
Open or high-resistance ground to pump or controller
Failed pump driver in the module (internal transistor/PWM driver)
Incorrect or stale module software/firmware causing message formatting errors
Blown in-line fuse or sticking relay supplying the pump

Fault status

⚠️ Status

Invalid data received from charge air cooler coolant pump — communication or sensor/actuator fault detected. Check wiring, supply, pump operation, and module/CAN communication.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 3.0 hours