In this video we will be going thru a crank no start situation with a U1000 DTC and the Security lamp lit on the instrument cluster. This is a very specific failure ultimately tied to the EVO/Passlock Module. We go thru how to isolate the problem to this particular EVO Passlock module, then how to diagnose whether the problem is in the wiring harness or the EVO Passlock module itself. Finally we show how to replace and reprogram the EVO/Passlock module to complete the DTC U1000 repair and allow the engine to start. The U1000 is a class II communications error DTC.

The truck illustrated is a 1999 Chevrolet K1500 Suburban LT, but the procedure will be the same for any 98 thru 00 OBS truck or SUV. Chevrolet, Cadillac, GMC, and Holden for Cheyenne, Escalade, Silverado, Tahoe, Yukon, Suburban, Sierra, and W/T trucks across C1500, K1500, C2500, K2500, C3500, and K3500 ratings.

The eBay and Amazon search links below are paid links, for which I may be compensated and earn a commission, if you choose to buy the parts and tools shown in this video thru them:

EVO Passlock module GM 19352769 (supersedes 16264965) for 6.5L diesels and all 2500/3500 trucks and SUVs: https://ebay.us/tj6gmr or https://amzn.to/3G8K2iV

EVO Passlock module GM 19352768 (supersedes 16264955) for gasoline 1500 trucks and SUVs: https://ebay.us/6y6pVF or https://amzn.to/3Tw6p4L

Hardcopy GM factory service manual for these years: https://ebay.us/JoWX03

And if I've saved you some $$ here, consider some coins for the coffee tip-jar! https://ko-fi.com/drshock

1998 1999 2000

Chapters:
0:00 - Problem overview
1:08 - Determining a likely root cause
1:47 - Removing the EVO/Passlock module
5:05 - Service manual diagnostic information
8:51 - Locating the EVO/Passlock module harness
10:29 - Running EVO/Passlock module diagnostics
17:31 - Testing replacement EVO/Passlock module
17:58 - EVO/Passlock module relearn procedure
23:55 - EVO/Passlock module tear down
26:55 - Trim reassembly

#drshock #obstruck #obstrucks

Disclaimer: DrShock, the alias for the human content creator for this YouTube channel, is not responsible for any damages, injuries, losses, or liabilities associated with any repairs, upgrades, or maintenance performed on yours, or any other, vehicle whatsoever. No warranty, express or implied, is made as to the accuracy or completeness of any information provided within this channel. Viewing and using the “as-is" information of this channel is totally at your own risk. Always wear personal protection equipment and follow appropriate vehicle manufacturer service manual guidelines with original manufacturer parts only when performing any repairs, upgrades, or maintenance upon any vehicle.