Audi DTC P1518 – Main Relay Circuit Short to B+
DTC P1518 meaning on Audi
DTC P1518 on an Audi indicates a fault with the Main Relay Circuit Short to B+. This means that there is a short circuit between the main relay and the positive battery terminal.
Audi DTC P1518 symptoms
Symptoms of DTC P1518 on an Audi may include:
- Engine stalling or not starting
- Loss of power
- Check Engine Light illuminated
Audi DTC P1518 causes
Common causes of DTC P1518 on an Audi include:
- Faulty main relay
- Short circuit in the wiring
- Corrosion or poor connections in the circuit
Audi DTC P1518 seriousness
DTC P1518 is a serious issue that can lead to engine performance problems and potential stalling. It is important to address this fault promptly to avoid further damage to the vehicle.
How to diagnose DTC P1518 on Audi
To diagnose DTC P1518 on an Audi, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the main relay and associated wiring for any visible damage or corrosion
- Check the connections and continuity in the circuit
How to fix DTC P1518 on Audi
To fix DTC P1518 on an Audi, you can follow these steps:
- Replace the faulty main relay if necessary
- Repair any damaged wiring or connections in the circuit
- Clean any corrosion and ensure proper contact in the circuit
How to erase DTC P1518 on Audi
To erase DTC P1518 on an Audi, you can clear the fault code using a diagnostic scanner. After fixing the underlying issue, you can reset the code to turn off the Check Engine Light and ensure the fault is resolved.
Recommended tools for Audi diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.