What Does C1326 Mean?
The ABS/traction control module has detected that battery voltage is outside the acceptable operating range, either too high or too low. This can cause erratic behavior in the electronic brake and stability control systems. The driver may notice the ABS and traction control warning lights illuminated, and in severe cases, loss of ABS and stability assist functions.
Common Causes
35%
Failing alternator producing over- or under-voltage
30%
Weak or degraded battery unable to maintain proper voltage
20%
Corroded or loose battery terminals/cables causing voltage drops
10%
Poor ground connection at ABS module or chassis
5%
Faulty ABS control module internal voltage sensing circuit
Diagnostic Steps
1
Measure battery voltage at the terminals with engine off — should read 12.4-12.7V for a fully charged battery. Below 12.2V indicates a weak or discharged battery.
2
Start the engine and measure charging voltage at the battery terminals — should read 13.5-14.8V. Above 15V indicates overcharging; below 13.2V indicates undercharging.
3
Inspect battery terminals and cable ends for corrosion, looseness, or damage. Measure voltage drop across each cable under load (should be less than 0.2V).
4
Check the ground connection at the ABS/traction control module — clean and tighten. Measure resistance from module ground pin to battery negative (should be less than 0.5 ohms).
5
If battery and charging system test normal, monitor live data voltage PID at the ABS module while operating accessories to check for transient voltage dips or spikes.
Estimated Repair Cost
$50 - $450
Parts + labor, varies by vehicle and location
The ABS/traction control module has detected that battery voltage is outside the acceptable operating range, either too high or too low. This can cause erratic behavior in the electronic brake and stability control systems. The driver may notice the ABS and traction control warning lights illuminate...
The most common cause of C1326 (Battery Out of Range) is: Failing alternator producing over- or under-voltage
Typical repair costs for C1326 range from $50 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS and traction control may be disabled, reducing braking effectiveness on slippery surfaces. The vehicle can still be driven cautiously at moderate speeds, but emergency braking and stability assist will not function. Diagnose promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1326 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Traction Control
Difficulty
Type
Manufacturer
Recommended Tools
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