Question about 1996 GMC Sonoma
Hi! Its definitely a PCM (powertrain control module) failure. The PCM has connectivity on all electrical current that runs inside the car including the engine and transmission. If the PCM is faulty everything else fails. Once the PCM is replaced you'll be good. Hope this helps and thank you for using FixYa!
Posted on Sep 10, 2010
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Posted on Jan 02, 2017
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Flasher units are always in one of 2 places, under glove box on pass side or in loom under steering wheel close to fuse panel.
On Sonoma it is under the lower dash panel, just to the left of the cigarette lighter. To get to it you must remove the ashtray. Then remove screws holding the plastic panel that is below the dashboard. You will see two round "can " shaped flasher units. The one on the right is for the signal lights. The one on the left is for the emergency flashers.
1 hex nut under ashtray and 2 torx to left of that. No need to completely remove the lower dash panel you took the screws out of. Just bend it down a little to get your hand in. You will see the 2 flasher pods.
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