Hyundai Ioniq: LCD Display Messages / Refill inverter coolant, Stop vehicle and check brakes/ Stop vehicle and check regen. brakes

Stop vehicle to charge battery/ Park with engine On to charge battery, Refuel to prevent Hybrid battery damage

Stop vehicle to charge battery/ Park with engine On to charge battery Either message is displayed when the hybrid battery power (SOC) level is low. In this case, park the vehicle in a safe location and wait until the hybrid battery is charged...

Check brakes/Check regenerative brakes, Check Virtual Engine Sound System

Check brakes/Check regenerative brakes Either message is displayed when the brake performance is low or the regenerative brake does not work properly due to a failure in the brake system...

Other information:

Hyundai Ioniq (AE) 2017-2025 Service Manual: HCU (Hybrid Control Unit). Schematic diagrams

HCU Terminal and Input / Output SignalTerminal FunctionConnector [C133-S] Pin No Description Connected to 1HCU GroundChassis ground2HCU GroundChassis ground3HCU GroundChassis ground4Battery power (B+)Battery5Battery power (B+)Battery6Battery power (B+)Battery7-　8-　9-　10-　11-　12-　13-　14-　15Brake Switch 2 signal inputBrake Switch (NC, IG1)16Brake Switch 1 signal inputBrake Switch (NO, B+)17-　18-　19-　20-　21-　22-　23-　24-　25-　26-　27-　28-　29-　30-　31-32-33-34-　35-　36-　37-　38Start signal inputSmart Key Unit39-　40-　41-　42-　43-　44-　45-　46-　47-　48-　49-　50-　51-　52-　53-　54-　55-　56-　57-　58-　59-　60-　61-　62-　63-　64-　65-　66-　67-　68-　69-　70-　71-　72-　73IGN signal inputSmart Key Unit74-　75-　76-　77-　78Powertrain CAN [High] signal inputOther control modules79Powertrain CAN [Low] signal inputOther control modules80-　81Hybrid CAN [High] signal inputOther control modules82Hybrid CAN [Low] signal inputOther control modules83-　84-　85-　86-　87-　88-　89-　90-　91-　92-　93-　94-　Input/Output signalConnector [C133-S] Pin no Description Condition Type Level 1HCU GroundAlwaysDC VoltageMax...

Hyundai Ioniq (AE) 2017-2025 Service Manual: Troubleshooting

Fail-Safe Mode Item Fail-Safe ETC MotorThrottle valve stuck at 7°TPSTPS 1 faultReplace it with TPS 2TPS 2 faultReplace it with TPS 1TPS 1, 2 faultThrottle Angle (°) Throttle valve stuck at 7°Duty (%)• TPS1 : 13...