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C0564 — Abs Control Module System Voltage Low

Generic OBD-II · all makesChassis

C0564 is a chassis diagnostic trouble code indicating that the Anti-lock Brake System (ABS) control module has detected a supply voltage below the minimum threshold required for proper operation. This low-voltage condition can impair the ABS module's ability to function correctly, potentially disabling anti-lock braking and traction control features.

Symptoms

What causes it — most likely first

1. Weak or failing battery

A discharged or old battery is the most common cause. The ABS module requires a minimum voltage (typically 10-11V) to operate, and a weak battery may fall below this threshold, especially under load.

2. Alternator or charging system malfunction

If the alternator is not charging properly, the system voltage can drop below acceptable levels during operation, triggering the code when the engine is running.

3. Corroded or loose battery terminals/connections

Poor electrical connections at the battery posts or ground straps can cause voltage drops, leading to insufficient voltage reaching the ABS module.

4. Blown or degraded ABS fuse

A fuse powering the ABS module that has failed can interrupt proper voltage supply. Checking the fuse is a quick initial diagnostic step.

5. Wiring harness or connector issues

Damaged, corroded, or loose wiring and connectors between the battery, ignition switch, and ABS module can cause voltage loss or intermittent power supply.

6. Failed ABS control module

While possible, a faulty ABS control module causing this code is relatively rare and should be ruled out only after all other voltage-related causes have been verified.

How it's diagnosed

  1. Measure battery resting voltage with a multimeter (should read 12.4V or higher); recharge or replace battery if low
  2. Inspect battery terminals, cable ends, and ground straps for corrosion, looseness, or damage
  3. Test alternator output voltage with engine running (should read 13.5-14.5V)
  4. Locate and inspect the ABS system fuse for continuity or visual damage
  5. Check for voltage drop at the ABS module connector while operating the system under load
  6. Inspect the ABS module wiring harness and connectors for corrosion, damage, or proper seating

Code facts & related codes

SystemChassis
StandardizationSAE generic — identical on every make
Related codesC0560 — Brake Pressure Sensor Missing CalibratC0561 — Vacuum Sensor Ab CorrelationC0562 — Brake Pedal Position Sensor Supply VolC0563 — Abs Control Module PerformanceC0565 — Abs Control Module System Voltage HighC0566 — Brake Booster Solenoid Circuitopen

Frequently asked

Does this code mean I need to replace the ABS control module or PCM/ECM?

No. The ABS control module itself is rarely the cause of a low-voltage code. The PCM/ECM is almost never responsible for this code. In the vast majority of cases, the issue is in the vehicle's charging system, battery, or electrical connections—repair these first before considering module replacement.

Is it safe to drive with code C0564 present?

Base braking function typically remains operational, but the anti-lock braking and traction control systems will likely be disabled. This means emergency stopping assistance may not be available. Drive cautiously and have the vehicle diagnosed promptly.

Will this code clear itself after battery replacement?

Possibly. If the battery was the root cause, replacing it and allowing the ABS module to re-learn may clear the code. However, if the underlying charging system or connection issue persists, the code will likely return.