P2509Powertrain Control Module (PCM) failure, Powertrain Control Module (PCM) power relay failure, Wiring issue
⚙️ Powertrain (Motor y Transmisión)🏭 Specific to Audi
The ECU detects sporadic interruptions of its supply voltage. The fault is set when supply drops below a threshold for short periods, often during cranking or due to a poor connection.
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Can I keep driving? With caution
You can drive to the shop, but do not postpone the repair. The problem may worsen and damage other components.
Sistema Afectado
Motor · Powertrain
La falla pertenece al grupo motopropulsor (motor y gestión electrónica).
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Possible Causes
The components or conditions that trigger this code
- 1Poor battery cable connection
- 2Intermittent main relay
- 3Connector with intermittent contact under vibration
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Estimated Cost
Approximate range in USD (varies by region and shop)
$100—$800
Varies by diagnosis
* Diagnosis only: $50–$150
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Quick Info
CodeP2509
CategoryMotor (P)
ManufacturerAudi
SeverityModerada
Symptoms0
Causes3
Solution steps0
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