Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This means that the car's computer is having trouble talking to the battery because a wire isn't working right.
The P15C4 code indicates that the voltage in the wakeup cable circuit of the battery sensor is lower than expected.
The battery sensor wakeup cable is responsible for signaling the vehicle's control module to activate or 'wake up' the battery monitoring system. A 'circuit low' condition means that the voltage level is below the threshold needed for proper communication and operation. This can affect the vehicle's ability to monitor the battery's state accurately.
• Check Engine Light is on
• Battery warning light may be illuminated
• Possible issues with battery charging or monitoring
• Faulty battery sensor
• Damaged or corroded wakeup cable
• Poor electrical connections
Battery Sensor: A device that monitors the battery's state of charge and health.
Wakeup Cable: A cable that signals the control module to activate the battery monitoring system.
• Inspect the battery sensor and wakeup cable for damage.
• Check for corrosion or loose connections at the battery terminals.
• Use a multimeter to measure the voltage in the wakeup cable circuit.
• Replace the faulty battery sensor.
• Repair or replace damaged wakeup cable.
• Clean and secure all electrical connections.
• Multimeter
• Wrench set
• Wire stripper/cutter
$100 - $300
Moderate
• Chevrolet Malibu
• Buick LaCrosse
• Cadillac ATS
• Regularly inspect battery terminals and cables.
• Ensure proper installation of battery sensors.
• Avoid exposure of electrical components to moisture.
Sensor Issue
• Have the battery and electrical system checked regularly.
• Avoid leaving electrical components on when the engine is off.
Repairs may be covered under the vehicle's electrical system warranty if applicable.
This code has been associated with issues in vehicles with advanced battery monitoring systems.
Moderate – It should be addressed to prevent battery monitoring issues, but it is not an immediate threat to vehicle operation.
Driving with a faulty battery sensor can lead to inaccurate battery monitoring, which may affect vehicle performance.
• Vehicle at operating temperature
• Battery fully charged
The battery sensor is typically located near the battery, often integrated into the battery terminal or in close proximity.
Q: Can I drive with a P15C4 code?
A: Yes, but it's best to get it checked soon to avoid battery monitoring issues.
Q: How do I clear the P15C4 code?
A: After repairs, use an OBD-II scanner to clear the code, or disconnect the battery for a few minutes.
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