P1108
HyundaiP1108 for Hyundai indicates a malfunction in the circuit responsible for the dual alternator battery warning lamp. This typically means the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an unexpected voltage or signal within the warning light circuit for the dual alternator system.
Medium SeverityThis code signifies an issue with the warning light circuit connected to your Hyundai's dual alternator system, meaning the battery light on your dashboard might not accurately reflect the charging system's status. The primary impact is that you won't be reliably alerted if your alternators or battery are failing to charge properly, potentially leading to a dead battery and stranded vehicle.
⚠️ Before You Begin (Safety First)
Always disconnect the battery's negative terminal before performing any electrical work to prevent short circuits and electrical shock. Ensure the vehicle is on a level surface with the parking brake engaged when working under the hood.
Common Symptoms
- Check Engine Light (CEL) illuminated
- Battery warning light on the dashboard may be on, off, or flickering erratically
- No obvious drivability issues initially
- Potential for a dead battery if a charging issue develops unnoticed
Common Causes
- Faulty wiring or corroded connectors in the battery lamp circuit
- Malfunctioning battery warning lamp in the instrument cluster
- Defective dual alternator regulator
- Issues with the Engine Control Module (ECM) or Powertrain Control Module (PCM)
- Blown fuse related to the charging system warning circuit
- Open or short circuit in the wiring between the alternators, battery, and ECM
Frequently reported on: Hyundai Santa Fe (2007-2012, select trims), Hyundai Veracruz (2007-2012, select trims), Hyundai Palisade (2020-2023, high trim levels)
Diagnostic Steps
- Visually inspect all wiring and connectors associated with the dual alternators and the battery warning lamp circuit for signs of damage, corrosion, or loose connections.
- Check the fuses related to the charging system and instrument cluster in both the engine bay and cabin fuse boxes.
- With the engine off, use a multimeter to check battery voltage; it should be around 12.6 volts.
- With the engine running, check the voltage at the battery terminals; it should be between 13.5 and 14.5 volts to confirm the alternators are charging.
- If the battery light is not illuminating at all when the ignition is turned to 'ON' (engine off), inspect the instrument cluster bulb or LED for the battery light.
👨🔧 When to Call a Professional
If after basic checks of wiring and connections you cannot identify the fault, or if the vehicle experiences intermittent charging issues despite the warning light circuit being addressed, it's best to consult a professional mechanic for advanced diagnostics and repair.
Commonly Asked Questions
What does the P1108 code mean for my Hyundai?
This code indicates a malfunction in the warning lamp circuit for your vehicle's dual alternator system, meaning the dashboard battery light may not function correctly.
Is it safe to drive with a P1108 code?
While the code itself points to a warning light issue, it's critical because you won't be alerted if your alternators are failing. It's advisable to diagnose and repair it promptly to prevent unexpected battery drain.
What are the common causes of P1108?
Common causes include faulty wiring, corroded connectors, a blown fuse in the charging system circuit, a malfunctioning battery light in the instrument cluster, or issues with the alternator regulator or ECM.
Can I fix the P1108 code myself?
Yes, many common issues like checking fuses, inspecting wiring, and cleaning connections can be performed by a DIY mechanic. However, advanced diagnostics or ECM issues may require professional help.
How do I know if my dual alternators are charging properly?
You can check the battery voltage with a multimeter. With the engine off, it should be around 12.6V. With the engine running, it should be between 13.5V and 14.5V, indicating proper charging.