Having your remote start fail while the check engine light illuminates is frustrating, but diagnosing the issue is achievable with systematic troubleshooting. This comprehensive guide will walk you through common causes and potential solutions, helping you pinpoint the problem and get your remote start functioning again.
Why is My Remote Starter Not Working and the Check Engine Light On?
This combination of symptoms often points to a deeper problem within your vehicle's electrical system or engine control unit (ECU). The check engine light indicates a fault detected by the car's onboard diagnostic system (OBD-II), and this fault may be directly or indirectly causing the remote start malfunction. It’s crucial to address both issues simultaneously for a complete fix.
Is it a Dead Battery?
This might seem obvious, but a weak battery can prevent your remote start from functioning. A low battery won't provide enough power to engage the starter motor, even with a remote signal. The check engine light could be related to the low voltage affecting other sensors. Check your battery voltage using a multimeter. If it's low, charge or replace the battery.
Problems with the Remote Starter System Itself
The remote start system might have a malfunction. This could involve issues with:
- Remote Control Battery: A simple fix is to replace the battery in your remote.
- Remote Control Programming: Your remote might need to be reprogrammed. Consult your vehicle's manual or a qualified mechanic for specific instructions.
- Damaged Wiring or Connectors: Worn, corroded, or damaged wiring within the remote start system can interrupt the signal. Inspection of the wiring harness is necessary.
- Faulty Remote Start Module: The module itself may have failed, requiring replacement.
What OBD-II Codes Are Present?
The check engine light indicates a diagnostic trouble code (DTC) stored in your car's ECU. You'll need an OBD-II scanner to retrieve this code. The code provides crucial information about the specific problem the car has detected. Common codes associated with remote start failure and the check engine light include those related to:
- Immobilizer System: Problems with the vehicle's anti-theft system can prevent the engine from starting, even with a remote signal.
- Transmission Control Module (TCM) Issues: A malfunctioning TCM can affect starting.
- Various Engine Sensors: Malfunctioning sensors like crankshaft position sensor, camshaft position sensor, or mass airflow sensor can prevent the car from starting properly and trigger the check engine light.
How Can I Troubleshoot a Remote Start System?
Troubleshooting requires a systematic approach:
- Check the Obvious: Battery voltage, remote battery, and simple checks as described above.
- Read the OBD-II Codes: Use an OBD-II scanner to obtain the specific codes. These codes are essential for diagnosis.
- Consult Your Vehicle's Manual: Your owner's manual may contain troubleshooting steps specific to your car model and remote start system.
- Seek Professional Help: If you're not comfortable working with your vehicle's electrical system, taking it to a qualified mechanic is recommended. They possess specialized diagnostic equipment and expertise.
What are the potential repair costs?
Repair costs vary greatly depending on the source of the problem. A simple battery replacement is inexpensive. However, replacing a faulty remote start module or repairing extensive wiring damage can be more costly.
Can I fix the remote start system myself?
For minor issues like replacing a remote battery or checking wiring, DIY repair is possible. However, more involved repairs should be left to trained professionals to avoid further damage.
Remember, safety is paramount. If you're unsure about any step of the troubleshooting process, consult a qualified mechanic. Improper repairs can lead to further damage to your vehicle.
