Symptoms
- Pressing remote start does nothing
- Remote start works sometimes but not consistently
- Car starts then immediately shuts off
- Indicator lights on remote don't respond
Likely causes
- CommonDead or weak remote/fob batteryRemote start fobs and key fobs both rely on small batteries that wear out.
- CommonSafety condition not metMost systems won't remote start if the hood is open, a door isn't fully closed, or the brake pedal area isn't clear.
- PossibleLow car battery voltageWeak 12V battery voltage can prevent remote start from engaging or cause it to shut off.
- PossibleAftermarket remote start module malfunctionIf installed aftermarket, the module itself can fail or need reprogramming.
- PossibleOut of range or signal interferenceBeing too far from the vehicle or near interference sources can block the signal.
What to do
- Replace the remote start fob's battery and test again.
- Make sure the hood is fully closed and latched, since many systems block remote start otherwise.
- Check that all doors are fully closed, not just appearing shut.
- Try getting closer to the vehicle to rule out range or interference issues.
- Have the 12V battery tested if remote start engages but then immediately dies.
- For aftermarket systems, check if the module has a reset procedure in its manual.
- Note any error blinks or patterns from the remote, which can indicate a specific fault code.
- Have the system checked by whoever installed it or a dealer if built-in, especially if it worked before and suddenly stopped.
Tools and parts
- Small screwdriver
- Replacement fob battery
Remote start fob batterySearch: “remote start fob battery replacement”
When to call a pro
Aftermarket remote start systems can be complex to diagnose; the original installer or a mobile auto electronics shop is often the fastest path to a fix.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.