The OBD2 code 151E in a Chevrolet Impala indicates an issue with the starter enable circuit. This code can manifest in several ways, from a complete failure to start to intermittent starting problems. This guide will walk you through understanding the 151E code, its potential causes, and how to troubleshoot and fix the problem. We’ll also outline a common modification for adding a remote starter switch, which often interacts with the starter enable circuit.
Understanding OBD2 Code 151E in an Impala
The 151E code specifically points to a problem with the signal that allows the starter to engage. This signal typically originates from the ignition switch, passes through various modules (including the Body Control Module or BCM), and finally activates the starter relay. A break or malfunction anywhere along this circuit can trigger the 151E code.
Potential Causes of OBD2 Code 151E
Several issues can cause the 151E code:
- Faulty Ignition Switch: A worn or damaged ignition switch can fail to send the necessary signal to engage the starter.
- Wiring Issues: Damaged, corroded, or loose wiring within the starter enable circuit can disrupt the signal.
- Bad Starter Relay: A malfunctioning starter relay may not activate even when receiving the correct signal.
- BCM Problems: Issues within the BCM, although less common, can interfere with the starter enable signal.
- Aftermarket Installations: Improperly installed remote starters or other aftermarket accessories can sometimes interfere with the factory starter circuit.
Troubleshooting the 151E Code
Before attempting any repairs, it’s crucial to diagnose the problem correctly:
- Read the Code: Use an OBD2 scanner to confirm the 151E code.
- Visual Inspection: Inspect the wiring and connectors in the starter enable circuit for any visible damage, corrosion, or loose connections. Pay particular attention to areas around the starter, ignition switch, and BCM.
- Test the Starter Relay: You can test the starter relay using a multimeter or by swapping it with a known good relay.
- Check the Ignition Switch: Test the ignition switch for proper functionality using a multimeter.
- Inspect BCM Connections: Carefully check the connections to the BCM, particularly connector “A” as it often houses wires related to the starting system. Refer to your Impala’s service manual for precise connector locations and wire diagrams.
Adding a Remote Starter Switch (Common Modification)
Many Impala owners add a remote starter switch. This modification involves tapping into the starter enable wire. Here’s a simplified overview of the process, referencing a popular method:
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Access the BCM: Remove necessary trim panels to access the BCM, typically located behind the driver-side dash. You’ll likely need to remove the dash cubby, hood release handle, and trim.
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Locate Connector “A”: Identify the correct BCM connector (“A” in most Impalas). This connector is often closest to the firewall.
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Identify the Starter Enable Wire: Consult your vehicle’s wiring diagram to identify the correct wire within connector “A”.
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Tap into the Wire: Carefully splice into the starter enable wire using a suitable method, such as soldering or using a tap connector. Avoid damaging the factory wiring.
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Connect the Switch: Connect the new switch to the tapped wire. Ensure all connections are secure and properly insulated.
Conclusion
The OBD2 code 151E in a Chevrolet Impala signifies a problem within the starter enable circuit. By systematically troubleshooting the potential causes, from wiring issues to faulty components, you can pinpoint the problem and perform the necessary repairs. While adding a remote starter switch is a popular modification, careful installation is crucial to avoid inadvertently triggering the 151E code. Always refer to your vehicle’s service manual for detailed wiring diagrams and specific instructions. If you’re unsure about any step, consult a qualified automotive technician.
