Power Supply Voltage Too Low
2012-2018 Audi A6 3.0L Supercharged V6
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
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P1602 on Other Vehicles
Common Questions
What does code P1602 mean on a 2012-2018 Audi A6?
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 A6?
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 2012-2018 Audi A6?
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.