P0607 on 2021-2022 Chevrolet Suburban: BCM Performance Fault Causes and Fixes

What's Unique About the 2021-2022 Chevrolet SUBURBAN

Unlike many vehicles where P0607 points to a critical failure of the main engine computer, on these specific Suburbans and their platform mates (Tahoe, Yukon, Escalade), it's a known issue with the Body Control Module (BCM). GM has acknowledged this with TSB #22-NA-044, which states the cause is an "internal BCM software anomaly." This is a crucial distinction, as the fix is typically a software update or a simple reset procedure rather than an expensive module replacement. The issue is common across vehicles using GM's Global B electrical architecture, also known as the Vehicle Intelligence Platform (VIP).

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light illuminated on the Driver Information Center (DIC).
• Remote start may be disabled while the Check Engine Light is active.
• No other drivability symptoms are typically reported for this specific software issue.

Most Likely Causes

1. BCM Software Anomaly 🔴 High Probability GM issued Technical Service Bulletin #22-NA-044 specifically identifying an "internal BCM software anomaly" as the primary cause for this code on 2021-2022 Suburbans and other vehicles on the Global B platform.
   How to confirm: A GM dealer or a qualified shop with access to GM's service information system can check the vehicle's VIN against TSB #22-NA-044. The code will be stored in the BCM.
   Typical fix: The TSB outlines a specific correction: DO NOT replace the BCM. The first step is to perform a BCM reset by removing the vbatt 1 (F49DR BCM1) and vbatt 2 (F4DR BCM 2) fuses for five minutes. If that fails, the BCM software must be updated by a technician using Techline Connect. This repair is covered under the Federal Emissions Warranty (8 years/80,000 miles) under labor operation code 2888468.
   Est. part cost: $0
2. Low Battery Voltage or Power Supply Issue ⚪ Low Probability → Shop Vehicle Battery Modern vehicles with complex electrical systems, like the Suburban, are sensitive to voltage fluctuations. A weak battery or poor ground connection can cause transient errors in various modules during startup.
   How to confirm: Test the battery voltage with a multimeter; it should be above 12.4 volts with the engine off. Test the charging system to ensure the alternator is providing 13.5-14.5 volts when running. Check for corroded or loose battery cables and main ground connections. Check ground resistance; it must be below 0.1 Ω.
   Typical fix: Recharge or replace the battery. Clean or tighten battery cable connections and primary ground straps. Diagnose and repair any parasitic draw.
   Est. part cost: $150-$350
3. Faulty Body Control Module (BCM) ⚪ Low Probability → Shop Body Control Module
   How to confirm: This should only be considered after the software reset and update specified in TSB #22-NA-044 have been performed and the code returns. A technician would then perform deeper diagnostics on the BCM itself, including verifying power and ground circuits directly at the module.
   Typical fix: Replace the Body Control Module and program it to the vehicle's VIN using GM's Service Programming System (SPS2). Post-programming setup functions may also be required.
   Est. part cost: $300-$600

Diagnosis Steps

1. Verify the Check Engine Light is on and scan for codes using a tool capable of reading all modules, like GM's GDS2. Confirm that P0607 is stored in the Body Control Module (K9 BCM), not the ECM.
2. Check for applicable Technical Service Bulletins. For this vehicle, TSB #22-NA-044 is the most critical piece of information.
3. Follow the correction procedure in TSB #22-NA-044: Reset the BCM by removing the vbatt 1 (F49DR BCM1) and vbatt 2 (F4DR BCM 2) fuses for five minutes. These fuses are located in the instrument panel fuse block on the passenger side. Reinstall fuses and clear codes.
4. If the code returns, the next step is to have a GM dealer or qualified shop perform a BCM software update using the Service Programming System (SPS2) within Techline Connect. This is covered under the Federal Emissions Warranty.
5. As a general best practice, check the vehicle's battery and charging system to ensure stable voltage is being supplied to all modules. A voltage below 12.4V at rest or an unstable alternator output can cause module errors. Ensure battery voltage is stable during any programming event.
6. If software-related fixes fail, inspect BCM power and ground circuits for integrity. Check for poor connections at main ground locations, such as those on the frame, firewall, and inside the cabin.
7. If all software-related fixes and wiring checks fail, the BCM itself may be faulty and require replacement and programming. This is the last resort.

Parts You'll Likely Need

• Body Control Module (BCM) / Serial Data Gateway Module (OEM #13542886 (replaces 13539766)) — This part is only needed in the rare case that the software update fails to resolve the issue. On these Suburbans, P0607 is almost always a software problem, not a hardware failure. The BCM on this platform is also referred to as the Serial Data Gateway Module.
  Trusted brands: ACDelco (Genuine GM)
  OEM price range: $300-$600
  Aftermarket price range: $150-$350

Technical Service Bulletins (TSBs) & Recalls

• 22-NA-044: States that a BCM software anomaly can set DTC P0607 and advises a reset procedure (removing fuses F49DR and F4DR for five minutes) or reprogramming, not replacement. It confirms the repair is covered under the emissions warranty.
• PIE0672B: An earlier bulletin where GM engineering requested field data to investigate the root cause for DTC P0607 set in the BCM, showing this was a known issue under investigation.

Platform-Specific Known Issues

• GM has issued Technical Service Bulletin #22-NA-044 specifically for the P0607 code on 2021-2022 Suburbans (and other similar models). It identifies a BCM software anomaly as the cause and advises against replacing the module as a first step.
• The official repair procedure is a targeted fuse pull to reset the BCM, or a software update if the reset doesn't work.
• This repair is covered under the Federal Emissions Control Systems Warranty for 8 years or 80,000 miles.

Mechanic-Grade Diagnostic Values

• BCM Power Pin Voltage — expected: 12.2 V ± 0.5 V with key on. Failure: Voltage below this range can cause unpredictable module behavior and set performance codes.
• BCM Ground Circuit Resistance — expected: Below 0.1 Ω. Failure: Higher resistance indicates a poor ground connection, which can mimic an internal module fault.
• System Voltage During Programming — expected: Stable battery voltage (maintained by a support tool). Failure: Fluctuations, spikes, or loss of voltage can interrupt programming and potentially damage the module.

Scan Tool Commands That Help

• GM GDS2 (Global Diagnostic System 2): Module Diagnostics > Body Control Module > Control Functions — Used to perform bidirectional tests (e.g., activate lights, locks) to verify if the BCM can command outputs, helping to differentiate a module failure from a wiring or component issue.
• GM SPS2 (Service Programming System 2): BCM Programming / Reprogramming — Used within Techline Connect to flash the BCM with the latest software update from GM's servers. This is the primary fix if the fuse-pull reset fails.
• GM GDS2: Setup SDM Primary Key in BCM — This function is required after replacing the BCM to synchronize it with the airbag system's Sensing and Diagnostic Module (SDM). Failure to perform this step can result in an airbag warning light and additional DTCs.
• GM GDS2: Brake Pedal Position Sensor Learn — This calibration may be required after BCM replacement or a major software update to ensure the brake system communicates correctly with the newly programmed module.

Wiring & Ground Locations

• BCM Ground (Interior) — Inside the cabin, beside the front left speaker. Access may require removing the A-pillar cover and lifting the front dash trim.. A poor ground connection at this point can cause the BCM to malfunction, potentially triggering a P0607 code. This should be inspected if software fixes do not resolve the issue.
• G218 — A primary ground point referenced in wiring diagrams for the BCM on the GMT1YC platform.. As a designated ground for the BCM, corrosion or looseness at this specific point can directly impact module operation and cause performance faults.
• Main Chassis Grounds — Locations include the firewall and on the frame behind both front wheels.. While not exclusive to the BCM, these main grounds are critical for the entire vehicle's electrical stability. A poor connection, especially at the battery-to-chassis ground, can cause voltage fluctuations that affect sensitive modules like the BCM.
• BCM Power/Ground Circuits — At the connectors of the K9 Body Control Module itself, located in the instrument panel.. A GM service bulletin warns that removing a BCM ground while the module is powered can cause internal damage. Technicians must disconnect the negative battery cable before servicing BCM ground connections.

Real Owner Repair Stories

• Reddit user, r/ChevyTahoe (GM Truck (similar platform)) — Multiple, persistent, and strange electrical problems.
  ❌ Tried (didn't work) Initial diagnostics pointed towards module failure.
  ✅ What actually fixed it The issue was ultimately traced to the negative battery cable. A smaller, secondary ground wire integrated into the cable assembly, which connected to a front body mount, was corroded. Replacing the entire negative battery cable assembly resolved all electrical problems.

When the Usual Fixes Don't Work

• While the vast majority of P0607 codes on this platform are resolved by the TSB #22-NA-044 software update, there are cases where the code returns. This almost always indicates that the root cause was not the software itself, but an underlying condition that the sensitive software cannot tolerate, such as unstable voltage or a poor ground. In one documented case on a similar GM truck, persistent electrical faults were only resolved after replacing a negative battery cable that had a corroded secondary ground wire. This highlights the importance of verifying the integrity of the BCM's power and ground supply circuits before resorting to replacing the BCM itself, even if a software update provides a temporary fix.

OEM Part Supersession History

• 13539766 → 13542886 — Part revision or update by the manufacturer.
  Heads up: On the Global B platform, this module is also referred to as the Serial Data Gateway Module. Ensure the correct part is ordered, as programming is required upon installation.