System Voltage Out Of Self Test Range
Table of contents
P1397 MERCURY Possible Causes
- Alternator belt loose or missing
- Low battery voltage
- Faulty Charging System
How do I fix code P1397 MERCURY?
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 P1397 MERCURY code
The cost of diagnosing the P1397 MERCURY 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.
When is the code detected
The Engine Control Module (ECM) has detected a voltage range that is higher or lower than expected.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1397 MERCURY Description
The P1397 code indicates that the 12-volt system voltage is too high or too low during the Key On Engine Off (KOEO) or key on engine running (KOER) self-test. It sets if the system voltage falls below or exceeds the calibrated threshold at any time during the KOEO or KOER self-test.