Various Car Electronics Car Remote Start Not Working: How to Fix It Yourself
Remote start systems will refuse to activate under several normal conditions that are not actually faults. Before assuming something is broken, rule out the common safety lockouts. A dead key fob battery is the most frequent real cause of remote start failure.
⚠️ Safety First
- Never use remote start in a closed garage — exhaust fumes are deadly.
- Make sure no one is under or near the vehicle before using remote start.
Parts You May Need
Step-by-Step Repair
- 1
Replace the key fob battery
A weak battery may still lock and unlock your doors but lack enough power for the remote start signal, which requires more range. Replace the battery with a fresh CR2032 or CR2025 (check your manual). This is the most common fix and costs just a few dollars.
- 2
Check for safety lockout conditions
Remote start will not work if the check engine light is on, the hood is open (or the hood sensor thinks it is), the car is not in Park (automatic) or Neutral (manual), or certain doors are not fully closed. Check all of these conditions. A stuck hood latch sensor is a surprisingly common culprit.
- 3
Try the correct button sequence
Make sure you are pressing the right buttons. Most factory systems require pressing the lock button first, then pressing and holding the remote start button within a few seconds. Aftermarket systems vary — check your remote start manual for the exact sequence. Some require pressing the start button twice.
- 4
Move closer to the vehicle
Remote start range is often shorter than the lock/unlock range. Try standing within 30 feet of the car with a clear line of sight. Radio interference from buildings, other vehicles, or nearby electronics can also reduce range.
- 5
Reset the system
For factory systems, try disconnecting the negative battery terminal for 5 minutes, then reconnecting it. For aftermarket systems, check the manual for a reset procedure — some have a small reset button on the control module, usually installed under the dashboard. After a reset, test the remote start again.
If That Didn't Work
- Low fuel level (some systems disable remote start below a quarter tank)
- Too many consecutive remote start attempts (system locks out temporarily)
- Aftermarket remote start antenna came loose
- Vehicle alarm triggered and locked out the system
When to Call a Professional
If none of the above steps fix the issue, the remote start control module or its wiring may have a fault. Aftermarket systems are especially prone to wiring issues over time. The shop that installed the system (if aftermarket) is the best place to start, as they know the wiring layout.
Related Repairs
Disclaimer: This guide is for informational and educational purposes only and does not constitute professional repair advice. All repairs are performed at your own risk. RepairItFree.com is not liable for any personal injury, property damage, device damage, voided warranties, or other losses resulting from the use of this information.
If you are unsure about any step — especially anything involving electricity, gas, water, or refrigerant — stop and consult a qualified professional. Your safety is more important than saving money.
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