P1246
Alternator Load Input Failed
P1246 is an OBD-II diagnostic trouble code meaning: Alternator Load Input Failed. Common causes: generator malfunction, open or short circuit in load signal circuit. Estimated repair cost: $33–167.
Symptoms
- Unstable engine operation at idle
- Flashing or dimming of headlights when load changes
- Battery charge lamp lights up
- RPM dips when turning on headlights, air conditioning or other consumers
- Increased fuel consumption
Causes
- Generator malfunction
- Open or short circuit in load signal circuit
- Poor contact in the generator or ECU connectors
- Voltage regulator relay malfunction
- ECU problems (rare)
How to Fix
- Check the voltage and charging current of the generator
- Inspect the load signal circuit for damage
- Check and clean the contacts in the generator and ECU connectors
- Test the voltage regulator relay
- If necessary, replace the generator or its components
Related codes
Error P1246 by Vehicle Brand
FAQ
What does the P1246 code mean?
P1246 is an OBD-II diagnostic trouble code that indicates: Alternator Load Input Failed
What causes a P1246 error code?
The most common causes of P1246 include: Generator malfunction; Open or short circuit in load signal circuit; Poor contact in the generator or ECU connectors; Voltage regulator relay malfunction.
How do I fix a P1246 diagnostic trouble code?
To fix P1246: Check the voltage and charging current of the generator. Inspect the load signal circuit for damage. Check and clean the contacts in the generator and ECU connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1246?
Limited driving only, diagnose soon
How much does it cost to fix P1246?
The estimated repair cost for P1246 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat