Park Relay Shorted To Battery
Table of contents
B2503 CADILLAC Possible Causes
- Faulty Park Relay
- Park Relay harness is open or shorted
- Park Relay circuit poor electrical connection
- Faulty Platform Zone Module (PZM)
How do I fix code B2503 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 B2503 CADILLAC code
The cost of diagnosing the B2503 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)
B2503 CADILLAC Description
When transaxle is in Park, Platform Zone Module (PZM) controls park relay output low to enable Brake Transaxle Shift Interlock (BTSI). PZM will continuously monitor this voltage at PZM. The Diagnostic Trouble Code (DTC) B2503 will set when park relay output is active and PZM determines output is high for 2 consecutive monitoring cycles. DTC B2503 will clear when park relay output is active and PZM determines output is low for 2 monitoring cycles.