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P2500 Buick Code - Low Signal Voltage On Generator Turn ON Signal Circuit

- Code Popularity: 1,340 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P2500 Buick?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Generator (Alternator)
  • Generator harness is open or shorted
  • Generator circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P2500 Buick?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2500 Buick code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P2500 Buick Description

The Engine Control Module (ECM) uses the generator turn ON signal circuit to control the load of the generator on the engine. A high-side driver in the ECM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. When ECM turns ON the high-side driver, the voltage regulator turns ON the field circuit. When ECM turns OFF the high-side driver, the voltage regulator turns OFF the field circuit.
The ECM monitors the state of the generator turn ON signal circuit. With the engine running, ECM should detect a high generator turn ON signal circuit. The Diagnostic Trouble Code (DTC) will set when the ECM detects a low signal voltage on the generator turn ON signal circuit for at least 15 seconds.
OBDII Code P2500 Buick - Low Signal Voltage On Generator Turn ON Signal Circuit - AutoCodes.com
P2500 Buick Code - Low Signal Voltage On Generator Turn ON Signal Circuit

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