U0077 Gmc, DTC U0077, is a diagnostic trouble code indicating a generic fault with the vehicle network communication (Network Communication). oemdtc. For May 10, 2017 · PIT5457A: Service ABS / TCS / Power Steering and/or Suspension Message DTC U0077 U0121 U0126 U0131 U0139 U0151 U0401 U0415 U0428 (Circuit 5986 High Resistance) ? 2014-2016 Cadillac Chevrolet GMC | gm. 3 with the following codes. Diagnostic Fault Information Circuit/System Description The devices connected to the chassis high speed GMLAN serial data circuits monitor for serial data communications during normal vehicle operation. 3 K5L - 2012 GMC Sierra SLT 6. U0077 00 GMC Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis Jul 23, 2019 · C7 Z06 Discussion - U0077 code tearing my hair out - Hello everyone, I have a 2017 z06/z07 that has a U0077 code, purchased pre owned, had 1800mi on odo, no check engine light on. U0077 = “Control Module Communication Bus E Off” – loss of communication on the Bus E network. Severity is High DTC Descriptor DTC U0077 Control Module Communication Chassis Expansion CAN Bus Off For symptom byte information, refer to Symptom Byte List. Learn what Control Module Communication Chassis Expansion CAN Bus means, location and how to repair. Grab an OBD-II sensor and scan the car Communication DTC's: U0077 U0121, U0126, U0131, U0139, U0401, U0415, and/or U0428 These concerns could be caused by high resistance/open in the Communication Enable circuit 5986. Unhook battery, clear codes they come back Sep 17, 2022 · 2009 GMC Yukon XL SLT 5. Based on current complaints, bulletins, and investigations on dot. If you notice strange symptoms, like engine trouble, and the locking system not working, the problem can be in the communication. 1 day ago · Code U0077 on a 2015-2019 Sierra Denali almost always indicates a wiring problem on the chassis CAN bus, often due to a pinched or corroded harness under the driver's side dash or sill plates. Try clearing the codes, they come back. The fix is typically a wire repair, not expensive module replacement. report, this code appears most often with Cadillac, Chevrolet, Buick, Gmc, Volvo. Common causes include Faulty control module on the chassis expansion CAN bus, Damaged wiring or connectors in the CAN bus network, Corrosion or poor connections in the communication lines. 2 GAT “Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter!”. Make: GMC Code: U0077 00 Definition: Checksum Data From LF Transmitter is Malfunctioning Description: Checksum data from LF transmitter is malfunctioning. I have changed battery cables, cleaned grounds, new distribution box, and got battery/alternator tested at Autozone. 2 NHT - 2013 GMC Sierra SLT 6. I've tried clearing this code Jan 13, 2026 · Solve your U0073 code communication issue fast with expert tips—discover the crucial steps to pinpoint and fix the error now! Apr 11, 2017 · PIT5457B Service ABS / TCS / Power Steering and/or Suspension Message DTC U0077 U0121 U0126 U0131 U0139 U0151 U0401 U0415 U0428 (Circuit 5986 High Resistance) Product Investigation Review Required Mar 29, 2025 · Running a modern car demands that a large number of modules and sensors communicate in real time. com Not sure it helps much. There are a lot of hits on that trouble code for other GM vehicles that point to various electrical connectors. Abs C0110-06 U0077-00 U0140-00 U0136-00 C0710-4B U0151-00 ECM P0700-00 U0101-00 U0121-00 U0140-00 BCM U0073-00 Mar 28, 2022 · Hello, I will try and keep this short and to the point. This DTC will be accompanied by Aug 25, 2021 · I have a 2014 Silverado 1500 5. Quick Answer The U0077 GMC code indicates a communication error between control modules in the vehicle's chassis expansion CAN (Controller Area Network) bus. Apr 11, 2017 · DTC's: B127B, U0077, U0117, U0121, U0126, U0131, U0139, U0151, U0401, U0415, U0428, U18A3, and/or U2179 These concerns could be caused by high resistance/open in the Communication Enable circuit 5986. The sensors and modules send information through the controller area network (CAN) bus to the powertrain control module (PCM). Need help. Throws a P0700, P2544, U0073, U0101. – These concerns could be caused by high resistance/open/short in the Communication Enable circuit 5986. Aug 5, 2019 · – DTCs: B127B, U0077, U0117, U0121, U0126, U0131, U0139, U0151, U0401, U0415, U0428, U18A3 and/or U2179. Common causes include Faulty control module in the chassis expansion CAN bus, Wiring harness issues, such as loose connections or damaged wires, Software glitches or programming errors. Repair Information for U0077 GMC code. U0077 Code - Control Module Communication Chassis Expansion CAN Bus Quick Answer The U0077 code indicates a communication problem between control modules on the chassis expansion CAN bus. I have read many owners of having similar problems with these codes, and I'm hoping that my resolved issues will help others as well. Apparently this is a BCM code. Typical signs: interior lights, power‑window or door‑lock functions stop; a “communication” warning lamp may flash. 2008 2500HD Sierra 4x4 6l90 WT (Very few modules, manual windows) Driving along, the trans goes in to limp mode. Nov 28, 2022 · Okay, 1st I'm not a GM tech, but my retired profession was troubleshooting and programming Allen Bradley Programmable Control unit for industrial machinery. 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