I have a 2017 Chev Express van 3500. Cannot locate the left turn signal relay.
Bulbs are new on left side--front and rear. Number 7 fuse is good. Left turn signal on dash just keeps flashing. Right is o.k. Brake lights are fine. Took the piece off under the steering wheel, but Cannot locate the left turn signal relay--if it's there. Does it have a separate case under the hood somewhere? Find nothing in under hood fuse box or the under drivers seat fuse box. Thanks, Steve
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Open Sep 05, 2025 - 02:18 PM
Chevrolet
1answer
Answer
Sep 07, 2025 - 08:18 PM
HieySteve! On your 2017 Chevy Express 3500 there actually isn’t a separate turn signal relay like older vehicles had. Instead, the turn signal function is controlled by the Body Control Module (BCM), which handles the flashing electronically. Since your right side works fine but the left keeps flashing without the bulbs lighting, the issue is most likely with the multifunction switch (turn signal lever), the wiring to the left-side bulbs, or a poor ground connection on that side. You’ve already ruled out bulbs and fuse #7, so the next step would be to check for power at the bulb sockets when the signal is on. If there’s no power, the multifunction switch or BCM may be at fault; if there is power but the lights don’t illuminate, then it’s likely a ground issue on the left circuit.
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