Hybrid Battery Pack Coolant Pump Control Circuit Low
The P0C48 code indicates that the hybrid battery pack coolant pump control circuit has a low voltage condition. This pump is responsible for circulating coolant through the hybrid battery pack to maintain optimal operating temperature. A low voltage signal suggests a problem in the electrical circuit, such as a faulty pump, damaged wiring, or a defective control module. If left unresolved, the battery pack may overheat, leading to reduced performance or potential damage.
01. Most Common Causes
- Faulty hybrid battery coolant pump
- Damaged or corroded wiring/connectors in the pump control circuit
- Blown fuse or relay for the coolant pump
- Defective hybrid battery control module
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy or hybrid system performance
- Overheating of hybrid battery pack
- Coolant pump not running or running intermittently
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the coolant pump wiring and connectors for damage or corrosion.
Step 3: Test the pump's electrical supply voltage and ground circuits with a multimeter.
Step 4: Check the fuse and relay for the coolant pump circuit.
Step 5: If circuits are intact, test the pump itself by applying direct power and ground to see if it operates.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the hybrid battery may overheat, causing reduced performance or permanent damage. Short trips to a repair shop are acceptable if the vehicle is not overheating.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the pump needs replacement or just wiring repairs. Labor and parts vary by vehicle make and model.