Chevrolet Tahoe 1995-2013 Relay Replacement and Troubleshooting Guide
A faulty relay can cause anything from a non-working A/C to a truck that won't start; here's how to diagnose and fix the problem.
- A bad relay can cause a no-start condition, either by preventing the starter from cranking or the fuel pump from running.
- Diagnosing a bad relay is simple: swap the suspect relay with a known good one of the same type (like the horn relay) and see if the problem moves.
- Replacement is a DIY-friendly task that requires no tools and takes only a few minutes.
- For critical relays (starter, fuel pump), an OEM-quality brand like ACDelco is a reliable choice, while standard aftermarket is suitable for less essential systems.
Signs of a Failing Relay in Your Tahoe
Because relays control many different parts of your truck, symptoms can vary widely depending on which relay has failed. Here are the most common failures and what to look for:
Fuel Pump Relay Failure
This is a critical relay. If it fails, your engine won't get the fuel it needs. The most common sign is an engine that cranks over but refuses to start. You may need to try starting it multiple times before it works, or it may not start at all. In rarer cases, the relay can get stuck in the 'on' position, causing the fuel pump to run continuously even when the ignition is off, which will drain your battery.
Starter Relay Failure
A bad starter relay is another reason your Tahoe might not start. In this case, you'll likely hear a single click or nothing at all when you turn the key. All your lights and radio will work, but the engine won't crank. This problem can also be intermittent, working one day and failing the next.
A/C Compressor Relay Failure
The most obvious symptom of a failed A/C relay is the air conditioning blowing warm or room-temperature air. The compressor, which cools the air, isn't receiving power to turn on. You might also hear a clicking sound from the fuse box area as the relay tries and fails to engage the compressor clutch.
Pro Tip: The Relay Swap Test
Your Tahoe's fuse box contains several identical relays. You can perform a quick diagnosis by swapping the suspected bad relay with a known good one from a non-essential system, like the horn. If you swap the horn relay with the A/C relay and the A/C starts working (and the horn stops), you've confirmed the relay is the problem. Just be sure to use a relay with the same part number printed on it.
Choosing the Right Aftermarket Relay
For a part like a relay, you have a few choices. Understanding the difference helps you make the right decision for your truck and budget.
- Premium Aftermarket (ACDelco): ACDelco is the original equipment (OE) supplier for General Motors. Choosing an ACDelco relay is essentially the same as buying the part from a Chevrolet dealer. It guarantees perfect fit and function, meeting the original factory standards. For critical systems like the fuel pump or starter, this is often the recommended choice for peace of mind.
- Standard Aftermarket (Replacement Brand): Standard aftermarket brands offer a cost-effective alternative. For a simple electronic component like a relay, these parts are often built to similar specifications and function reliably. For less critical systems like the A/C or fog lights, a standard aftermarket relay provides excellent value.
Cost of Replacing a Chevrolet Tahoe Relay
| Part Type | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $7 - $25 |
| New Aftermarket | $18.34 - $18.62 |
| Shop Labor (Diagnosis & Replacement) | $50 - $100 |
Cost estimates are for the part itself and do not include taxes or shipping. Shop labor can vary based on local rates and the time required for diagnosis.
Frequently Asked Questions
Where are the relays located on my Chevrolet Tahoe?
Most of the important relays are in the main fuse box in the engine compartment. Depending on the year, there may be a second fuse/relay panel inside the vehicle, usually on the driver's side of the dashboard. The inside of the fuse box cover has a diagram that shows what each relay does.
Can I replace a relay myself?
Yes, this is one of the easiest repairs you can do. No tools are required. Simply locate the correct relay in the fuse box, pull the old one straight out, and push the new one firmly into its place. It should only take a few minutes.
Are all the relays in the fuse box the same?
No, but many of them are. You will find several relays with the same size, shape, and part number that are interchangeable. However, there are also specialized relays for certain functions. Always match the part number printed on the top or side of the relay you are replacing.
My truck won't start. Is it the relay or the starter?
It can be hard to tell. If you hear a single, sharp click when you turn the key, the starter relay is likely working, and the problem may be the starter motor itself. If you hear no sound at all from the engine bay, the starter relay is a more likely culprit. Performing the 'relay swap test' mentioned above is a good way to rule out a bad relay before suspecting a more expensive part like the starter.
Technical Specifications
OEM Part Numbers: 13500114 15-81106 D1780C 13503103 13503102
Most relays in the 1995-2013 Tahoe are 4-pin or 5-pin, 12V, single-pole single-throw (SPST) or single-pole double-throw (SPDT) micro relays. Always match the part number and pin configuration of the original relay.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Chevrolet Tahoe: