P0562 on 2024 Chevrolet Silverado 2500: Low Voltage Causes & Fixes

What's Unique About the 2024-2024 Chevrolet SILVERADO 2500

On the 2024 Silverado 2500, P0562 has a specific, documented link to the brake system. GM issued Technical Service Bulletin #24-NA-050 because a software anomaly in the Electronic Brake Control Module (EBCM) can falsely trigger P0562 along with code P0606 (Control Module Processor Fault). This can be caused by a temporary voltage drop during an engine crank, a jump start, or even while charging a low battery. In this specific scenario, the root cause isn't a failing battery or alternator, but a software issue that requires a dealer to reprogram the EBCM. Owners of similar GM trucks have reported the code appearing specifically in the brake module, causing engine RPMs to fluctuate wildly as the system reacts to the perceived voltage instability.

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
• "Service Brakes" or "Service ESC" message on the driver information center (when accompanied by P0606)
• Engine stalling or running rough, especially at idle
• Engine RPMs fluctuate wildly up and down
• Difficulty starting the engine or a no-start condition
• Dimming or flickering headlights and interior lights
• Erratic behavior from other electrical components like the radio or power windows
• Loss of power brake assist after an engine start.
🎬 Watch: Understanding the GM brake assist failure and software fix.

Most Likely Causes

1. Failing or Weak Battery 🔴 High Probability → Shop Vehicle Battery Modern trucks have a high electrical demand with numerous modules. The AGM batteries used can fail internally without obvious signs. TSB #24-NA-050 notes that a low battery state of charge during cranking is a primary trigger for the EBCM software fault.
   How to confirm: Perform a load test on the battery using a digital battery tester. A simple voltage check is insufficient. A healthy AGM battery should read ~12.6V when off and hold voltage above 9.6V during a load test; a drop below 9V indicates a failed battery.
   Typical fix: Replace the battery. These trucks often use a Group Size 94R AGM battery.
   Est. part cost: $200-$400
2. Failing Alternator 🔴 High Probability → Shop Alternator The alternator is responsible for powering the vehicle's electronics and recharging the battery. If its internal voltage regulator fails, voltage can become unstable, triggering the code.
   How to confirm: With the engine running, measure the voltage at the battery terminals. It should be stable, between 13.5V and 14.8V. If the voltage is low, fluctuates wildly, or doesn't increase as RPMs rise, the alternator is likely faulty.
   Typical fix: Replace the alternator. Depending on the truck's options, it may have a 170A, 220A, or even dual alternators.
   Est. part cost: $350-$750
3. Electronic Brake Control Module (EBCM) Software Anomaly 🟡 Medium Probability As identified in TSB #24-NA-050, a software glitch can cause the EBCM to set P0562 and P0606, even if the charging system is healthy. This is often triggered by a jump start or low voltage during cranking.
   How to confirm: This must be confirmed by a GM dealer. If P0562 is stored along with P0606 in the EBCM, and the battery/alternator test good, this is the likely cause. The TSB specifies a labor operation time of 0.4 hours for the fix.
   Typical fix: The dealer will reprogram the Electronic Brake Control Module (EBCM) with updated software. The TSB explicitly states not to replace the module for this condition.
   Est. part cost: $0 (if under warranty), $150-$250 (dealer labor for reprogram)
4. Loose or Corroded Battery Terminals/Cables 🟡 Medium Probability → Shop Vehicle Battery Vibrations and exposure to the elements can lead to loose connections or corrosion, creating high resistance in the charging circuit.
   How to confirm: Visually inspect the battery terminals and main cable ends for white or greenish corrosion. Physically try to twist the terminals; they should not move. Check both the main positive post and the ground connections.
   Typical fix: Disconnect, clean the terminals and cable ends with a wire brush, re-tighten securely, and apply dielectric grease to prevent future corrosion.
   Est. part cost: $5-$20 (for cleaning tools)
5. Poor Ground Connection ⚪ Low Probability Multiple ground points are critical for modern vehicle electronics. A loose or corroded main engine-to-chassis or battery-to-chassis ground can cause widespread, intermittent voltage issues.
   How to confirm: Perform a voltage drop test on the ground side of the circuit. 🎬 Watch: How to perform a voltage drop test like a pro. Connect a multimeter between the negative battery terminal and the engine block; the reading should be less than 0.2V with the engine running. Visually inspect main ground straps on the frame rail, firewall, and from the battery to the chassis.
   Typical fix: Locate, remove, clean all contact surfaces to bare metal, and securely re-tighten the main ground straps.
   Est. part cost: $0-$30 (if a strap needs replacement)

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): This is very rare. Before condemning the PCM, all other possibilities, including battery, alternator, wiring, grounds, and the EBCM software issue, must be exhaustively ruled out. A Reddit user with a similar issue on a 2022 Silverado suspected the PCM after replacing the battery and alternator with no success.
• Aftermarket Device in DLC Port: GM Corporate Bulletin #13-08-116-001I warns that aftermarket devices (such as insurance trackers or tuners) plugged into the OBD-II port can keep data buses active, leading to a discharged battery, communication codes, and other electrical issues that could precipitate a P0562 code.

Diagnosis Steps

1. Scan for all diagnostic trouble codes in all modules. Pay close attention if P0606 is present in the Electronic Brake Control Module (EBCM).
2. If P0606 is present with P0562, consult TSB #24-NA-050. The vehicle likely needs an EBCM reprogram at a dealership. The TSB advises testing the battery first.
3. If P0562 is present alone, start with a visual inspection of the battery, its terminals, and the main power/ground cables for looseness or corrosion.
4. With the engine off, measure the battery voltage using a multimeter. A healthy AGM battery should be at approximately 12.6 volts.
5. Perform a battery load test with a proper electronic tester to check its health under stress. Many auto parts stores offer this service for free.
6. Start the engine. Measure the charging voltage at the battery terminals. It should be stable, between 13.5 and 14.8 volts.
7. If charging voltage is low or unstable, the alternator is the primary suspect. If it's too high (over 15.0V), the voltage regulator (internal to the alternator) is likely faulty.
8. If the battery and alternator test good, perform voltage drop tests on the main positive and negative cables to check for hidden resistance in the wiring. Check the ground connection from the battery to the chassis and the engine block to the firewall.
9. Check for any aftermarket devices plugged into the OBD-II port and remove them, as they can cause battery drain and electrical faults.

Parts You'll Likely Need

• Battery (AGM) (OEM #ACDelco Gold 94RAGM (GM #88865934)) — The battery is the most common failure point for low voltage conditions. Modern AGM batteries are sensitive and can fail under the high electrical load of new trucks.
  Trusted brands: ACDelco, DieHard, Interstate, X2Power
  OEM price range: $250-$400
  Aftermarket price range: $200-$350
• Alternator (OEM #ACDelco GM Genuine Parts 13552630 (220 Amp option)) — The alternator recharges the battery and powers the truck's electronics when running. A failed alternator will cause the battery to discharge, leading to a P0562 code.
  Trusted brands: ACDelco, Bosch, Denso
  OEM price range: $450-$750
  Aftermarket price range: $350-$600

Related Codes That Often Appear With This One

• P0606 — As per TSB #24-NA-050, a software issue in the Electronic Brake Control Module (EBCM) can cause P0606 (Control Module Processor Fault) to set alongside P0562. This combination is the key indicator for the software-related issue.
• P0563 — This code for 'System Voltage High' can appear if the voltage regulator on the alternator is failing erratically. TSB #24-NA-050 also mentions that P0563 can be set along with P0606 due to the same EBCM software anomaly, often triggered by battery charging.

Technical Service Bulletins (TSBs) & Recalls

• 24-NA-050: Addresses a condition where the truck may set DTC P0606 in the EBCM along with P0562 (low voltage) or P0563 (high voltage) due to a software anomaly. The fix is reprogramming the EBCM after verifying battery health.
• PIT6474A: A Preliminary Information bulletin for 2022-2024 Silverado/Sierra 1500s describing a loss of brake assist with codes P0562 and P0606 after an engine start event, caused by a voltage drop to the brake module. The fix involves cleaning battery connections, testing the charging system, and reprogramming the brake module.

Platform-Specific Known Issues

• TSB #24-NA-050: A known software issue in the Electronic Brake Control Module (EBCM) can cause it to set DTC P0606 along with P0562 or P0563. The official fix is to have a dealer reprogram the EBCM, not replace it. This can be triggered by a low battery during cranking, a jump start, or battery charging.
• Sensitive Brake Module: Forum discussions confirm that the brake control module is often the first to report low voltage, leading to symptoms like a fluctuating idle even before other modules set codes.

Mechanic-Grade Diagnostic Values

• Battery Voltage (Key-Off, Rest) — expected: ~12.6 Volts. Failure: Below 12.4V indicates a weak or discharged battery.
• Charging System Voltage (Engine Running) — expected: 13.5V - 14.8V. Failure: Below 13.2V or above 15.0V indicates a faulty alternator or voltage regulator.
• Battery Load Test — expected: Voltage stays above 9.6V during a 15-second, 200-amp load.. Failure: Voltage drops below 9.0V, indicating the battery needs replacement.
• Main Ground Cable Voltage Drop — expected: < 0.2 Volts. Failure: A reading higher than 0.2V between the negative battery post and the chassis/engine block indicates high resistance in the ground circuit.

Hidden / Shadow Codes Worth Checking

• P0606 stored in EBCM: While not a 'shadow code' in the traditional sense, TSB #24-NA-050 identifies that when P0606 (Control Module Processor Fault) is found in the Electronic Brake Control Module (EBCM) along with P0562, it is the specific signature of the software anomaly. This combination points directly to the TSB fix and away from hardware replacement. (see via A professional scan tool capable of reading codes from all modules, such as the dealer GDS2 tool.)

Scan Tool Commands That Help

• GDS2 (Global Diagnostic System 2): Service Programming System (SPS) — This function is required to update the software calibration in the Electronic Brake Control Module (EBCM) to correct the false P0562/P0606 codes, as instructed by TSB #24-NA-050.
• GDS2 (Global Diagnostic System 2): Clear DTCs / Erase EBCM P0606 — TSB #24-NA-050 specifically notes that simply disconnecting the battery may not clear the codes. A scan tool must be used to erase the P0606 from the EBCM to extinguish the MIL after verifying the battery is healthy.
• GDS2 (Global Diagnostic System 2): Data Bus Diagnostic Tool - Message Monitor — If a parasitic draw is suspected of causing the low battery condition that leads to P0562, this function can be used to passively monitor the data bus with the key off to see which control modules are remaining 'awake' and causing the drain.

Wiring & Ground Locations

• EBCM Connector — At the Electronic Brake Control Module, typically mounted on the ABS hydraulic unit in the engine bay.. This is a 38-pin sealed connector where the EBCM receives its power and ground. Verifying clean, tight connections here is critical. A pinout diagram is needed to test for correct voltage and ground at the module itself.
• Main Battery Ground — The primary ground cable runs from the negative battery terminal to the engine block and/or the vehicle frame.. This is the most critical ground for the entire vehicle. Corrosion or a loose connection here will cause system-wide low voltage and codes like P0562.
• Underhood Fuse Block Connector (Gray) — Located in the main fuse box on the passenger side of the engine bay. The gray connector must be removed from the bottom of the fuse block to access its wiring.. This connector contains main power distribution wires. For example, the heavy-gauge yellow wire for the starter circuit is located here. Damage or corrosion in these primary power pathways can cause voltage drops.
• G110 / G114 — On prior model year Silverados, these are major grounds located on the frame rails in the front of the vehicle. Their exact location on the 2024 model should be verified with service information.. GM has issued information (PIE0548) for previous models regarding loose connections at these specific ground points causing various electrical issues. Checking major frame grounds is a crucial step.

Real Owner Repair Stories

• Reddit user post on r/MechanicAdvice (2022 Chevrolet Silverado 5.3L) — P0562 code set in the Brake System Control Module (EBCM), engine RPMs fluctuating up and down, nearly stalling. Voltage at battery fluctuated from 14V down to 11V at idle.
  ❌ Tried (didn't work) Replaced the battery, Replaced the alternator, Checked for corrosion at EBCM and PCM, Performed voltage drop test on alternator cable
  ✅ What actually fixed it The user had not found the fix after replacing common hardware. The symptoms and codes (P0562 in EBCM) are a direct match for TSB #24-NA-050, indicating the actual fix is a dealer-performed EBCM software update, not hardware replacement.

"I Checked Everything" — The Actual Cause

• A common scenario for this code on this specific truck is that the battery and alternator will both pass diagnostic tests (load test, voltage output check). However, the P0562 and P0606 codes will remain stored in the EBCM. This is because the root cause is not a hardware failure, but a software sensitivity to minor, transient voltage fluctuations during events like engine cranking, as described in TSB #24-NA-050.

When the Usual Fixes Don't Work

• While P0562 is most commonly caused by a failing battery or alternator, on the 2024 Silverado 2500 there is strong evidence that these parts may be replaced without fixing the problem. A documented repair story for a similar late-model Silverado showed that replacing both the battery and alternator did not clear the P0562 code or its symptoms when the fault was stored in the brake module. This points to the critical importance of checking for the P0606 code in the EBCM and consulting TSB #24-NA-050 before replacing any hardware. The true fix is often a software update, not a new part.