GM Bulletin PIT5689M: No Restart After Auto Stop, No Crank, Dead Battery — Check This Passenger-Side Firewall Ground

General Motors has released an updated version of PIT5689M (Dec 30, 2025) addressing a wide range of electrical and drivability complaints that often appear unrelated at first glance. In reality, many of these issues trace back to one overlooked engine-to-body ground connection on the passenger-side firewall.

If you’re chasing intermittent no-crank, dead batteries, glow plug codes, transfer case faults, or a Christmas-tree dash of warning lights, this bulletin is one you need to understand.

Vehicles Affected

This bulletin applies to the following Chevrolet and GMC trucks:

• Silverado 1500 / Sierra 1500

  • 2019 (New Model)

  • 2020–2025

• Silverado 2500HD / 3500HD

  • 2020–2025

• Sierra 2500HD / 3500HD

  • 2020–2025

Regions:North America, Europe, Australia, and New Zealand

Common Customer Complaints

GM lists a wide range of symptoms, many of which appear intermittent or unrelated:

• Engine does not restart after an Auto Stop event

• No crank (intermittent or constant)

• Dead battery

• Transfer case range actuator learn failure

• SES / MIL illuminated

  
  

DTCs Commonly Observed

This issue can trigger dozens of codes across multiple modules, including (but not limited to):

• Voltage / power codes: P0562, U3003, U3006, U3007

• Starter / control codes: P0615, P0617

• Glow plug & diesel-specific codes: P0671–P0678, P067B, P067D, P068D, P068F

• Communication faults: U0102, U0106, U0284, U0285, U111A, U111E, U1348

• Transfer case & chassis codes: P0700, C15AC, C118D

When you see this many modules complaining at once, you should already be thinking power or ground integrity.

Root Cause: Passenger-Side Firewall Engine Ground

GM has identified the root cause as a loose, broken, or improperly oriented engine-to-body ground strap.

Specifically:

• G132 – Body ground

• G134 – Engine ground

These grounds connect the engine to the body on the passenger-side firewall. If this connection loosens, corrodes, or becomes stressed by powertrain movement, module voltage drops occur—leading to no-start conditions, network faults, and erratic behavior.

GM’s Correction Procedure

Per PIT5689M, the fix is straightforward but must be done correctly:

1. Inspect grounds G132 and G134

   • Look for looseness, corrosion, broken strands, or deformation

2. Tighten loose fasteners

3. Replace the ground strap if damaged

4. Verify proper orientation

   • The strap must be routed to allow normal powertrain movement without tension

Improper routing is a repeat-failure risk, especially on vehicles that see heavy engine torque or off-road use.

Warranty Coverage

For vehicles covered under Bumper-to-Bumper (or Canada Base Warranty):

• Labor Operation: 4042010

• Description: Battery Negative Cable Extension / Cable Strap Replacement

• Labor Time: Use published time

Always verify coverage through Investigate Vehicle History (IVH) before proceeding.

Why This Matters (Real-World Take)

From a diagnostic standpoint, this bulletin explains why some trucks:

• Kill batteries repeatedly with no clear draw

• Refuse to restart after Auto Stop

• Throw glow plug or transfer case codes that “don’t make sense”

• Seem fine one day and dead the next

Before condemning batteries, starters, ECMs, glow plugs, or transfer case modules, physically inspect this ground. It’s a fast check that can save hours of diagnostic time and thousands in unnecessary parts.

PIT5689M is a reminder that modern GM trucks are extremely sensitive to voltage integrity. A single loose ground at the passenger-side firewall can mimic multiple system failures across the vehicle.

If you’re troubleshooting unexplained electrical issues on a Silverado or Sierra—especially a Duramax—this ground should be near the top of your checklist.

Know the fix before the failure. #3MAX