Power Supply Voltage Too Low
2019-2024 Audi e-tron Electric
Description
The ECU detected that its supply voltage has dropped below the minimum operating threshold. Low voltage can cause erratic ECU behavior, false fault codes, and poor engine performance.
Symptoms
- Check Engine Light
- Multiple fault codes stored
- Engine running rough
- Starting difficulties
- Electrical accessories dimming
Common Causes
- Weak or failing battery
- Faulty alternator or voltage regulator
- Corroded battery terminals
- High-resistance connection in power supply
- Parasitic drain depleting battery
Diagnostic Steps
- Test battery voltage and load test
- Test alternator output voltage and current
- Inspect battery terminals and connections
- Check main power supply wiring to ECU
- Test for parasitic electrical drain
Repair Notes
Replace the battery or alternator; clean and tighten all power supply connections.
Related Codes
Other Powertrain Codes
- P0070Ambient Air Temperature Sensor Circuit
- P0071Ambient Air Temperature Sensor Range/Performance
- P0072Ambient Air Temperature Sensor Circuit Low
- P0073Ambient Air Temperature Sensor Circuit High
- P0115Engine Coolant Temperature (ECT) Sensor 1 Circuit
- P0116ECT Sensor 1 Circuit Range/Performance
- P0117ECT Sensor 1 Circuit Low Input
- P0118ECT Sensor 1 Circuit High Input
- P0119ECT Sensor 1 Circuit Intermittent
- P0125Insufficient Coolant Temperature for Closed Loop Fuel Control
P1602 on Other Vehicles
Common Questions
What does code P1602 mean on a 2019-2024 Audi e-tron?
P1602 stands for "Power Supply Voltage Too Low". The ECU detected that its supply voltage has dropped below the minimum operating threshold. Low voltage can cause erratic ECU behavior, false fault codes, and poor engine performance.
What are the symptoms of P1602 on a Audi e-tron?
Common symptoms of P1602 include: Check Engine Light, Multiple fault codes stored, Engine running rough, Starting difficulties, Electrical accessories dimming.
What causes P1602 on a 2019-2024 Audi e-tron?
Common causes of P1602 include: Weak or failing battery, Faulty alternator or voltage regulator, Corroded battery terminals, High-resistance connection in power supply, Parasitic drain depleting battery.