Low Signal Voltage On Generator Turn ON Signal Circuit
Table of contents
P2500 CADILLAC Possible Causes
- Faulty Generator (Alternator)
- Generator harness is open or shorted
- Generator circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How do I fix code P2500 CADILLAC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P2500 CADILLAC code
The cost of diagnosing the P2500 CADILLAC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2500 CADILLAC 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.