Hybrid Battery Diagnosis
Also called hybrid battery checking
This is a diagnosis, not a repair. The hybrid battery is made of many cell blocks, and the car only reports a problem when one falls out of line with the rest. Testing reads each block's voltage under load, checks the cooling fan and its filter, and reviews hybrid fault codes. It tells you whether you have one weak block, a cooling problem, or a pack genuinely near the end of its life.
Signs you need this
- Hybrid system warning light on the dashboard
- Battery charge gauge dropping and rising very quickly
- Petrol engine running far more than it used to
- Noticeable loss of acceleration
- Fuel average falling steadily over recent months
Not all of these have to be present, and one of them on its own can mean something else entirely. That is what the diagnosis is for.
What the job includes
- Reading hybrid system fault codes and stored history
- Recording individual block voltages at rest and under load
- Checking the battery cooling fan, duct and filter for dust blockage
- Testing the twelve volt battery, which causes many false hybrid warnings
- A written finding stating which blocks are out of line and by how much
How we do it
Isolate the high voltage
High voltage is present in this system, so the pack is handled under isolation procedure before any measurement.
Read the codes
Hybrid fault codes and stored data often name the block or the circuit that triggered the warning.
Measure each block
Block voltages are recorded at rest and under load, because a weak block only shows clearly when it is working.
Check the cooling
The cooling fan, duct and filter are inspected, since dust blockage is a common cause of premature cell failure here.
Report the options
You get the measurements and an honest view on cell-level work, cooling repair, or accepting the pack is finished.
How we work
The same on every job, which is why we can write it down.
Diagnosis before quote
We find the fault first. A price given over the phone for a noise nobody has heard is a guess.
The price is agreed first
You approve the work and the cost before a spanner is picked up. Extra work means another call.
Parts you can check
We tell you whether a part is genuine, OEM, aftermarket or used, and what each one costs.
Old parts returned
Ask and we will hand back whatever we replaced. It is the simplest proof that the job was done.
Book hybrid battery diagnosis
Fill this in and a person will call you back to confirm the time and the price. Only your name and one way to reach you are required.
You send this
Takes a minute. No payment, no obligation.
We call you
To confirm the car, the time and the location.
Tell us the car and the symptom
We will arrange a mechanic at your location, or a slot at the nearest workshop. No payment until the price is agreed.