DC/DC Converter Crank Control Circuit High Voltage
Table of contents
P305D GMC Possible Causes
- Faulty Power Supply Transformer
- Power Supply Transformer harness is open or shorted
- Power Supply Transformer circuit poor electrical connection
How do I fix code P305D GMC?
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 P305D GMC code
The cost of diagnosing the P305D GMC 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)
P305D GMC Description
The Power Supply Transformer is used to boost battery voltage to sensitive loads during engine restart. It provides two voltage outputs that provide the boosted voltage. The Power Supply Transformer communicates to the Engine Control Module (ECM), and sends to the ECM the state of the crank control input.