Tesland

HV battery repair for your Tesla

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At Tesland, we specialise in professional high-voltage (HV) battery repairs for all Tesla models. Whether you are looking for an affordable solution or complete peace of mind, we offer three service levels to suit your needs.

What does a battery repair at Tesland cost?

Basic: €2,685.95 excl. VAT

The basic repair includes:

  • Extensive diagnosis
  • Inspection and repair of defective battery module and battery pack leakage
  • Consumables and coolant
  • Necessary repairs
  • 1-year warranty or 20,000 km on the repaired/replaced module

Premium: €5,330.58 excl. VAT

The Premium repair additionally includes:

  • Physical inspection of all battery modules for corrosion and loose connections
  • Inspection of the rear drive unit for fluid leaks (valid for large drive unit only)
  • 1-year warranty or 20,000 km on the complete battery pack

Ultimate: €6,570.25 excl. VAT

The Ultimate repair additionally includes:

  • Same as Premium, but with a 2-year or 40,000 km warranty on the battery

We can optionally arrange collection and transport of your car via an authorised recovery company (costs depend on distance).

For more information see this information page

BMB Professional Detector V4 — diagnoseapparaat voor Tesla HV-batterijmodules
Geopende HV-batterij Tesla Model S met zichtbare batterijmodules

How do I know if my car’s battery is faulty?

If you see a fault code on your Tesla, this indicates that something is wrong. Below are some codes that may indicate a battery defect:

What does each BMS fault code mean?

BMS_a064SW SOC Imbalance — software detects a state-of-charge imbalance between cells.
BMS_a066SOC Imbalance Warning — large charge differences between cells. Module balancing or inspection recommended.
BMS_a074Max Charge Level Reduced — maximum charge level automatically reduced to protect the pack.
BMS_f017Fault: brick cell voltage too high — pack may shut down completely. Immediate attention required.
BMS_f018Fault: brick cell voltage too low (SW Brick UV) — pack shuts down to prevent damage.
BMS_f107SW Cell Voltage Sensor fault — often caused by a loose voltage sense or balance wire on the BMB.
BMS_f123Critically low isolation resistance — immediate investigation required; driving is unsafe.
BMS_u008Limp mode active — acceleration and top speed limited. May recover on the next drive if the fault clears.
BMS_u016Extra isolation check before closing contactors — slight start delay for added safety.
BMS_u018Large cell voltage imbalance — charging limited to ~50% to prevent damage.
BMS_u019Acceleration reduced by BMS — HV circuit issue or voltage imbalance.
BMS_u025Maximum brick voltage reduced due to ageing — informational; car remains driveable.
BMS_u029Charge level limited to ~50% due to internal pack condition — reduced range. Inspection recommended.
BMS_w008HVIL safety loop interrupted — charging and starting blocked. Check HV connectors and wiring.
BMS_w017Brick cell voltage too high — may cause power loss or shutdown. Immediate diagnosis required.
BMS_w018Brick cell voltage too low — driving or charging may become impossible. Check cells for wear.
BMS_w026Pack contactors opened by BMS — car will not start. Manual reset required via Tesla Toolbox.
BMS_w027Repeated isolation loss while driving — indicates leakage current or short circuit in the HV system.
BMS_w035Insufficient isolation with contactors closed — often caused by moisture, leakage, or a faulty HV component.
BMS_w050BMS lost contact with a battery monitoring board (BMB) — voltage/temperature signals missing; starting may be blocked.
BMS_w073Abnormal HV behaviour during precharge — check precharge components and HV circuit.
BMS_w086Precharge cannot start — contactors will not close. Check precharge resistor and HV wiring.
BMS_w097Brick below minimum voltage threshold — pack may shut down immediately. Urgent diagnosis required.
BMS_w107Cell voltage sensor fault on a brick — check voltage sense and balance wires on the BMB.
BMS_w117Delta-SOC deviation between cells — large state-of-charge differences indicate pack imbalance.
BMS_w123Isolation resistance too low with contactors open — isolation measurement and inspection required.
BMS_w129Faulty voltage sensor connector on a BMB — car still drives but risk of further failure increases.
BMS_w137Brick over-discharged — check promptly to prevent permanent cell damage.
BMS_w142Isolation degradation detected — HV insulation deteriorating; battery inspection strongly advised.
BMS_w150Precharge process too slow — contactors will not close. Check precharge circuit and HV components.
BMS_w151Isolation too low with contactors closed — driving and charging no longer possible. Immediate repair required.
BMS_w158Early isolation warning (logging) — isolation values declining; preventive inspection recommended.
BMS_w170Module overvoltage — check the affected module for faulty cells or balancing issues.
BMS_w172Low isolation values measured over multiple trips — service and isolation inspection recommended.

What happens when the HV battery is defective?

When a problem occurs in the HV section of your car, the system will shut down for safety reasons. As a result, your 12-volt battery will no longer be charged and your car will quickly go “dead”.

We can help in these situations. In most cases your Tesla will need to be transported to us. Our specialist will then perform an initial diagnosis using Tesla software. If a battery repair is necessary, the battery must be removed from underneath the car, carefully opened and the problem located. This process requires great care. A common cause of battery failure is moisture build-up. Moisture enters via condensation or through valves in the battery edges. Valves become dirty in dusty conditions, allowing moisture in — temperature fluctuations contribute to this. Moisture can also enter through corroded holes in the fuse cover or through bolt holes in the battery lid.

Moisture trapped inside the battery causes oxidation — circuit boards in the battery can fail. We can repair or replace these boards with replacement parts. In rarer cases, the battery cells themselves become damaged, requiring the entire battery module to be replaced. (These costs are not included in the repair prices listed above; we will communicate this with you.)

Once everything is repaired and tested, the battery is carefully closed, sealed and reinstalled under your car. A test drive is performed and the battery is charged.

BMB Modules Detector V4 — uitleesscherm met celspanningen

Suspect a battery problem?

Contact our specialist for a no-obligation diagnosis and a tailored repair proposal — for both Model S and Model X.

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