F1 Chinese GP: McLaren disaster, Norris and Piastri do not start due to electrical problems with the Mercedes power unit

A weekend to forget for McLaren in Shanghai: both MCL40s of Lando Norris and Oscar Piastri remain stranded before the start of the Chinese Grand Prix because of two different electrical problems linked to the Mercedes power unit.

McLaren power unit problems in China: cars out before the start

The 2026 Chinese Grand Prix opens with a sensational twist in the Shanghai paddock: McLaren cannot even line up its cars on the starting grid.

The two cars of the British team, driven by Lando Norris and Oscar Piastri, are forced back to the pits before the race has even officially begun. The reason is linked to two different electrical problems found in the Mercedes power unit, which prevented the drivers from taking the start of the Grand Prix.

This is an extremely rare situation in modern Formula 1, where the reliability levels of the cars are generally very high. However, in McLaren's case, a series of technical anomalies forced the team to stop before the lights even went out.

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McLaren power unit problems in China: the problem on Norris's McLaren

The first warning sign comes a few minutes before the start procedure begins.

During the installation laps to the grid, McLaren's technicians identify an electrical problem on Lando Norris's car.

The data from the telemetry shows anomalies in the management of the hybrid system of the Mercedes power unit.

In particular, the technicians detect irregularities in the operation of some electronic components connected to the energy recovery system.

This system is one of the most complex elements of a Formula 1 power unit.

It is mainly made up of:

MGU-K (energy recovery under braking) MGU-H (energy recovery from exhaust gases) battery and electronic control unit

When one of these components has problems, the car cannot be used safely.

For this reason McLaren immediately decides to recall Norris to the pits, preventing him from lining up on the grid.

Piastri also forced to retire before the start

The situation becomes even more surprising a few minutes later.

While the mechanics work on Norris's car, a second electrical problem also emerges on Oscar Piastri's car.

In this case too, the fault concerns the electrical system linked to the Mercedes power unit.

Although the problem is different from the one found on Norris's car, the final effect is the same: the car cannot be used.

The team is therefore forced to bring Piastri's MCL40 back into the garage as well.

At that point it becomes clear that McLaren will not be able to take part in the race.

A very rare double DNS in Formula 1

The result is an extremely rare event in the recent history of Formula 1.

Both McLaren cars are recorded as DNS (Did Not Start), meaning they did not take part in the race.

In a championship where the reliability of the cars has reached very high levels, a situation like this is almost unprecedented.

In recent years, similar incidents have been extremely rare.

This makes McLaren's technical problem even more surprising.

McLaren power unit problems in China: what may have happened

To better understand what happened, the functioning of modern Formula 1 power units must be analysed.

Since 2014, the cars have used extremely complex hybrid engines, made up of several integrated systems.

A Formula 1 power unit includes:

V6 turbo combustion engine MGU-K MGU-H high-voltage batteries electronic control unit software control system

One of the most delicate points of this system is precisely the electronic management of energy flows.

The software must coordinate:

energy recovery power delivery component temperatures electrical flows

An electrical problem can therefore be caused by several factors:

faulty sensors software errors wiring problems battery anomalies

In McLaren's case, it seems the two faults are independent of one another, even if both are linked to the Mercedes power unit.

The role of the Mercedes power unit

McLaren has been using Mercedes power units for several seasons already.

It is one of the most reliable and competitive units in the championship.

Precisely for this reason, the double electrical problem is even more surprising.

The team engineers will now have to analyse the data carefully to understand:

the origin of the faults whether there is a connection between the two problems whether it is a component or integration defect

These analyses will be crucial to prevent similar situations from happening again in the next races.

A heavy blow for McLaren's season

From a sporting point of view, the double DNS is a very heavy blow.

In Formula 1 every race is crucial for scoring points in the constructors' standings.

Not taking part in a race means losing an important opportunity.

For McLaren, the Chinese GP was a key round of the season.

The team was indeed aiming to consolidate its position in the constructors' standings.

The consequences for the championship

Missing the race could have important consequences in the standings.

In the constructors' championship every point is crucial.

A weekend without points can completely change the balance.

Moreover, the team's direct rivals from Woking will have the chance to gain ground.

For this reason the Chinese GP could become one of the decisive moments of McLaren's season.

The team's reaction

After the incident, the McLaren team immediately began an in-depth technical analysis.

The engineers are examining:

telemetry data electronic logs power unit control systems

The aim is to identify the origin of the problem with precision.

Only in this way will it be possible to ensure that the cars can return to the track safely in the next races.

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Conclusions

The 2026 Chinese Grand Prix therefore turns into a weekend to forget for McLaren.

Two separate electrical problems prevent Norris and Piastri from taking the start of the race, causing a very rare double DNS.

For the British team it will now be crucial to understand what happened.

Only an in-depth technical analysis can prevent a similar episode from happening again during the season.

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