P1503
Load Signal From Alternator DF Terminal Implausible Signal
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)
Symptoms
- Check Engine Light Is On
- Unstable engine operation at idle
- Battery charging problems
- Reduced power of electrical equipment
- Periodic malfunctions in the operation of car electronics
Causes
- Generator malfunction
- Open or short circuit in terminal DF circuit
- Poor contact in connectors or corrosion
- Engine control unit (ECU) malfunction
- Relay or fuse problems
How to Fix
- Check the condition of the generator and its terminals
- Inspect the DF terminal circuit for damage.
- Check contacts and connectors for corrosion
- Test the generator on the stand
- If necessary, replace the generator or repair the wiring