P0562 on 2024 Chevrolet Silverado 3500: Low Voltage Causes and Fixes

What's Unique About the 2024-2024 Chevrolet SILVERADO 3500

For the 2024 Silverado 3500, P0562 is not always a straightforward charging system problem. A specific Technical Service Bulletin (TSB #24-NA-050) highlights a known issue where a software anomaly in the Electronic Brake Control Module (EBCM) can trigger P0562 along with code P0606 ("Control Module Processor Performance"). This often happens after a low battery event like a jump-start or even just charging a depleted battery, causing a persistent Check Engine Light even after the battery issue is resolved. An updated version of the TSB clarifies the cause is a software diagnostic anomaly and the definitive fix is reprogramming the EBCM. 🎬 Watch: Understanding P0562 causes, symptoms, and common fixes. This makes it crucial to check for associated codes and TSBs before replacing expensive components like the alternator or EBCM.

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 is on
• Battery or charging system warning light is on
• Engine may crank slowly or not start
• Stalling, especially at idle or when electrical loads are high
• Engine RPMs fluctuate, nearly stalling
• Dimming or flickering headlights and interior lights
• Erratic operation of electrical components (radio, windows, etc.)
• Harsh or poor transmission shifting
• Warning messages related to the service brakes, especially if code P0606 is also present

Most Likely Causes

1. Weak or Failing Battery 🔴 High Probability Modern trucks have a high electrical demand from features like infotainment, heated seats, and advanced safety systems, which can expose a weak battery. Low voltage events from a weak battery can also trigger software-related faults as described in TSB 24-NA-050. These trucks typically use an Absorbent Glass Mat (AGM) battery to meet these demands.
   How to confirm: Test the battery voltage with the engine off (should be ~12.6V). Perform a load test to check its health. Many auto parts stores offer this service for free. A battery can show good voltage but fail under load, which is a classic sign of a failing battery. If voltage drops below 9V during a load test, the battery should be replaced.
   Typical fix: Replace the battery if it fails the load test. Common group sizes for this truck are H6 and H7 AGM.
   Est. part cost: $200-$400
2. Loose or Corroded Battery Terminals/Cables 🔴 High Probability Vibrations from normal operation and exposure to the elements can lead to loose connections or corrosion, creating high resistance and voltage drops.
   How to confirm: Visually inspect the battery terminals for white or greenish corrosion. Physically check if the cable clamps are tight and cannot be moved by hand. A voltage drop test across the terminals can reveal hidden resistance.
   Typical fix: Disconnect the battery (negative first), clean the terminals and clamps with a wire brush and a terminal cleaning tool, and re-tighten securely. Applying dielectric grease can help prevent future corrosion.
   Est. part cost: $5-$20
3. Failing Alternator 🟡 Medium Probability The alternator is responsible for charging the battery and powering the truck's electronics while running. If it fails, system voltage will drop quickly. The 2024 Silverado 3500 can be equipped with alternators of various amperages, such as 170-amp or 220-amp models, to support different option packages.
   How to confirm: With the engine running, measure the voltage at the battery terminals. It should be between 13.5V and 14.8V. If it's below this range, the alternator is likely not charging properly. If the vehicle starts with a jump but dies when put into gear, it's a classic sign the alternator is not supporting the electrical load.
   Typical fix: Replace the alternator. An OEM ACDelco part is recommended.
   Est. part cost: $350-$650
4. EBCM Software Anomaly (TSB 24-NA-050) 🟡 Medium Probability A specific software issue identified by GM for 2024 Silverado HD models can cause the Electronic Brake Control Module (EBCM) to set P0562 along with P0606 after a low or high voltage event (like a jump start or battery charging).
   How to confirm: Scan for other codes. If P0606 is present in the EBCM along with P0562 (or P0563), this TSB is the likely cause. A GM dealer can confirm the software version and perform the update using the GDS2 scan tool.
   Typical fix: The dealer needs to reprogram the EBCM with an updated software calibration. The TSB explicitly states NOT to replace the module for this condition. The warranty labor operation for this fix is #2486148 and takes approximately 0.4 hours.
   Est. part cost: $0 (if under warranty) - $200 (labor)
5. Poor Engine or Body Ground Straps ⚪ Low Probability GM has issued bulletins (like PIT5689K) for current generation Silverados regarding loose or broken ground straps causing a wide range of electrical issues, including P0562. Key ground locations that connect the engine to the body are known potential failure points.
   How to confirm: Visually inspect the main ground straps from the engine to the chassis and from the battery to the body. On these trucks, pay special attention to the grounds on the back of the cylinder heads, from the engine block to the frame, and from the firewall to the engine. Check for looseness, corrosion, or breakage.
   Typical fix: Clean and tighten the ground connection or replace the damaged strap. Ensure the mating surfaces are bare metal for a good connection.
   Est. part cost: $20-$50

Rare But Worth Checking

• Damaged Wiring: Check the main power cable from the alternator to the battery for any signs of corrosion, damage, or looseness, as this can cause a voltage drop. Also inspect the EBCM harness for any chafing, particularly near the transmission, which has been noted as a potential issue on related platforms.
• Parasitic Battery Drain: An electrical component may not be shutting off correctly, slowly draining the battery overnight. This would lead to a low voltage condition on startup. A proper parasitic draw test involves letting the vehicle's modules go to sleep (about 10-20 minutes, but up to 2 hours for all systems) and measuring the amperage draw, which should be very low (under 50 mA). Aftermarket accessories are a common source 🎬 Watch: The easiest way to test for a parasitic battery draw. of parasitic draws.

Diagnosis Steps

1. Scan for all diagnostic trouble codes. Pay close attention to codes stored in other modules, especially the EBCM (Electronic Brake Control Module).
2. If P0606 is present with P0562, refer to TSB #24-NA-050. The fix is likely a dealer-installed software update for the EBCM.
3. Visually inspect the battery, its terminals, and the main power and ground cables for corrosion or looseness.
4. With the engine off, use a multimeter to measure the battery's static voltage. A healthy battery should read approximately 12.6 volts. Anything below 12.4V suggests a discharged or failing battery.
5. Have the battery professionally load-tested to confirm its health. A battery can show good voltage but fail under load.
6. Start the engine. Measure the voltage at the battery terminals. A healthy charging system should produce between 13.5 and 14.8 volts.
7. If charging voltage is low, inspect the alternator, its connections, and the serpentine belt tension.
8. If the battery and alternator test good, inspect the main engine-to-chassis ground straps for integrity and tightness. Key locations include engine-to-body straps and grounds near the PCM and fuel pump.
9. If the battery repeatedly dies, perform a parasitic draw test. After letting the truck sit with doors closed and key fob away for at least 20 minutes (up to 2 hours for all modules to sleep), measure the current draw from the negative battery terminal. A normal reading is under 50mA. If higher, pull fuses one by one to isolate the draining circuit.

Parts You'll Likely Need

• Battery — The most frequent cause of low system voltage is a battery that can no longer hold an adequate charge. These trucks use AGM batteries in sizes like H6 or H7.
  Trusted brands: ACDelco, DieHard, Optima, Duralast

Related Codes That Often Appear With This One

• P0606 — Control Module Processor Performance. Per TSB 24-NA-050, this code is often set in the EBCM along with P0562 due to a software anomaly triggered by a low or high voltage event.
• P0563 — System Voltage High. This can also appear with P0606 under TSB 24-NA-050, indicating the EBCM's voltage diagnostics are acting erratically due to the same software anomaly.
• U-series codes — Various communication codes (U-codes) may appear if low voltage disrupts communication between modules. A bulletin for similar trucks (PIT5689K) lists numerous U-codes that can accompany P0562 when a ground strap is loose. A severe low voltage event can cause upwards of 100 DTCs to set across all modules.

Technical Service Bulletins (TSBs) & Recalls

• 24-NA-050: Addresses Silverado and Sierra trucks setting DTC P0606 in the EBCM along with P0562 or P0563. It instructs technicians to check the battery and, if it's good, reprogram the EBCM with an updated calibration. It explicitly warns against replacing the EBCM for this condition.
• PIT5689K: Details how a loose or broken engine-to-body ground strap can cause P0562, along with many other electrical fault codes and symptoms like no-crank or a dead battery on 2020-2024 Silverado HD trucks.

Platform-Specific Known Issues

• TSB 24-NA-050: EBCM Software Update: A known software issue in the Electronic Brake Control Module (EBCM) can cause P0562 and P0606 to set after a low voltage event, such as a jump start. The official fix is to reprogram the EBCM with a new calibration, not replace it.
• TSB PIT5689K: Loose Ground Straps: A preliminary information bulletin for 2020-2024 HD trucks points to a loose or broken engine-to-body ground strap (G132, G134) as a cause for P0562 and a host of other electrical DTCs and no-start conditions.

Mechanic-Grade Diagnostic Values

• Static Battery Voltage (Engine Off) — expected: ~12.6V. Failure: Below 12.4V indicates a discharged or weak battery.
• Charging System Voltage (Engine Running) — expected: 13.5V - 14.8V. Failure: Below 13.5V indicates a charging system fault (likely alternator).
• DTC P0562 Voltage Threshold — expected: System voltage must stay above ~10V.. Failure: Voltage dropping below 10V for a sustained period (e.g., 60 seconds) will set the code.
• Parasitic Current Draw (after sleep mode) — expected: < 50 mA. Failure: A sustained draw over 100 mA indicates a significant parasitic drain that will deplete the battery.
• Battery Load Test — expected: Voltage stays above 9.6V during a 15-second load test.. Failure: Voltage dropping below 9.0V under load indicates a failed battery, even if static voltage is normal.

Hidden / Shadow Codes Worth Checking

• P0606 (in EBCM): When found in the Electronic Brake Control Module (EBCM) alongside P0562 or P0563, it does not indicate a failed module but rather a software anomaly triggered by a voltage fluctuation, as per TSB 24-NA-050. (see via A professional scan tool (like the dealer GDS2) that can read codes from all vehicle modules, not just the PCM/ECM.)

Scan Tool Commands That Help

• GDS2 (GM Global Diagnostic System 2): Module Diagnostics > EBCM > Re-program — This is the specific fix required by TSB 24-NA-050 to resolve the P0562/P0606 combination. It updates the EBCM software to correct the diagnostic anomaly.
• GDS2 (GM Global Diagnostic System 2): Clear DTCs — TSB 24-NA-050 explicitly states that after a voltage event, the P0606 code may not clear by disconnecting the battery and must be erased from the EBCM using a scan tool.
• GDS2 (GM Global Diagnostic System 2): Data Display > BCM or ECM — To monitor live charging system data, including commands to the alternator and feedback from the Battery Current Sensor, to diagnose complex charging issues.

Wiring & Ground Locations

• Battery Current Sensor — On the main negative battery cable, near the battery terminal.. This sensor reports the battery's state of charge to the BCM. A faulty sensor can cause the system to undercharge the battery, leading to a low voltage condition. It must be installed in the original orientation.
• Engine Block to Chassis/Firewall Ground — A braided strap typically running from the rear of a cylinder head or the engine block to the vehicle's firewall.. This is a primary ground path for the entire electrical system. High resistance here due to corrosion or looseness can cause widespread, intermittent electrical problems, including low voltage codes.
• Battery to Frame Ground — A cable running from the negative battery terminal to a bolt on the vehicle's frame or chassis, often near the radiator support.. Establishes the primary ground reference for the vehicle's body and electrical components. A poor connection here can cause charging system faults.
• Instrument Panel Fuse Blocks — Located in the engine compartment, and behind panels on the left (driver) and right (passenger) sides of the dashboard.. These locations are needed to perform parasitic draw testing by pulling individual fuses to isolate a draining circuit.

Real Owner Repair Stories

• Reddit user @mgstoybox (2024 Silverado 2500HD) — Truck had a low battery message ('features disabled to save battery') and wouldn't start. After being jumped, it ran fine but had a Check Engine Light on and the Chevy app reported an ABS system issue.
  ❌ Tried (didn't work) Jumping the truck resolved the no-start but not the check engine light.
  ✅ What actually fixed it The owner checked their Chevy app and found an open recall for their truck related to an Over-The-Air (OTA) update causing battery drain, which aligns with the symptoms of TSB 24-NA-050. The fix is a dealer-installed software update.
• Reddit user @Either_Leadership_20 (2024 GM Truck) — After a dead battery and a jump start, the truck had 'all kinds of warning lights,' headlights flashed erratically, and blinkers turned on randomly.
  ❌ Tried (didn't work) Waiting for the issue to resolve itself. The user was told by the dealer that the codes do not clear on their own.
  ✅ What actually fixed it The truck had to be taken to the dealership to have the numerous codes cleared. This highlights that a low voltage event can cause persistent electronic faults that require a scan tool to reset, as noted in TSB 24-NA-050.

Model Year Variations Within This Range

• 2024: The 2024 Silverado HD models are specifically named in TSB 24-NA-050, which addresses the P0562/P0606 code combination in the EBCM. While older models may have voltage sensitivity, this specific software-related fault and its corresponding EBCM reprogram fix are documented for the 2024 model year.