P1564moderate severityPowertrain
Idle Speed Control Throttle Position Lower Limit Not Reached
on 2000 Audi A6 2.8L V6 · AWD
What this code means
The ECU detected that the throttle plate cannot reach its lower limit (closed position) during idle speed control. The minimum throttle opening is higher than expected.
Symptoms
- Idle speed too high
- Check Engine Light
- Cannot achieve low idle
- Increased fuel consumption at idle
Common causes
- Carbon buildup preventing throttle closure
- Throttle body motor binding
- Throttle cable binding (older models)
- Cruise control cable interference
- Damaged throttle body bore
Diagnostic steps
- Clean throttle body thoroughly
- Check throttle cable (if equipped) for binding
- Perform throttle body adaptation
- Inspect throttle body bore for damage
- Test throttle motor operation
Repair notes
Clean the throttle body to remove carbon and perform throttle body adaptation.
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Bluetooth code reader (~$25)
Veepeak OBDCheck BLE →
Pairs with your phone — reads and clears codes, live data.
Serious DIY (~$100)
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
Shop-grade tablet (~$300+)
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Other Powertrain codes on this vehicle
00532
Supply Voltage B+ Signal too Low
16394
Camshaft/Crankshaft Position Correlation Bank 1
16395
Camshaft Position Actuator Circuit/Open Bank 1
16486
Mass or Volume Air Flow Circuit Low Input
16487
Mass or Volume Air Flow Circuit High Input
16500
Engine Coolant Temperature Circuit Malfunction
16501
Engine Coolant Temperature Circuit Low Input
16502
Engine Coolant Temperature Circuit High Input
16514
O2 Sensor Circuit Bank 1 Sensor 1
16515
O2 Sensor Circuit Low Voltage Bank 1 Sensor 1