P1A28
Hybrid Battery 1 Voltage High
P1A28 is an OBD-II diagnostic trouble code meaning: Hybrid Battery 1 Voltage High. Common causes: hybrid charging system malfunction, voltage imbalance between battery cells. Estimated repair cost: $167–889.
Symptoms
- Check Engine light comes on
- Hybrid system power reduction
- The car goes into emergency mode
- Unusual sounds from the battery compartment
- Reduced performance of the hybrid system
Causes
- Hybrid charging system malfunction
- Voltage imbalance between battery cells
- Damage or wear to the hybrid battery
- Problems with the hybrid system control module
- Short circuit in high voltage circuit
How to Fix
- Diagnostics of the state of the hybrid battery
- Checking the charging and cell balancing system
- Replacing faulty battery cells
- Control Module Software Update
- Replacing the hybrid battery if necessary
Related codes
FAQ
What does the P1A28 code mean?
P1A28 is an OBD-II diagnostic trouble code that indicates: Hybrid Battery 1 Voltage High
What causes a P1A28 error code?
The most common causes of P1A28 include: Hybrid charging system malfunction; Voltage imbalance between battery cells; Damage or wear to the hybrid battery; Problems with the hybrid system control module.
How do I fix a P1A28 diagnostic trouble code?
To fix P1A28: Diagnostics of the state of the hybrid battery. Checking the charging and cell balancing system. Replacing faulty battery cells. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1A28?
Do not drive — repair immediately
How much does it cost to fix P1A28?
The estimated repair cost for P1A28 is $167–889. Actual cost depends on your vehicle, location, and labor rates.
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