The Songz Automobile Air Conditioning Co., Ltd (SZSE:002454) share price has fared very poorly over the last month, falling by a substantial 28%. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 33% in that time.

Following the heavy fall in price, Songz Automobile Air Conditioning's price-to-earnings (or "P/E") ratio of 23x might make it look like a buy right now compared to the market in China, where around half of the companies have P/E ratios above 28x and even P/E's above 50x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's limited.

With earnings growth that's exceedingly strong of late, Songz Automobile Air Conditioning has been doing very well. One possibility is that the P/E is low because investors think this strong earnings growth might actually underperform the broader market in the near future. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's out of favour.

Does Growth Match The Low P/E?

There's an inherent assumption that a company should underperform the market for P/E ratios like Songz Automobile Air Conditioning's to be considered reasonable.

If we review the last year of earnings growth, the company posted a terrific increase of 99%. Still, incredibly EPS has fallen 3.7% in total from three years ago, which is quite disappointing. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 41% shows it's an unpleasant look.

With this information, we are not surprised that Songz Automobile Air Conditioning is trading at a P/E lower than the market. However, we think shrinking earnings are unlikely to lead to a stable P/E over the longer term, which could set up shareholders for future disappointment. Even just maintaining these prices could be difficult to achieve as recent earnings trends are already weighing down the shares.

What We Can Learn From Songz Automobile Air Conditioning's P/E?

The softening of Songz Automobile Air Conditioning's shares means its P/E is now sitting at a pretty low level. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Songz Automobile Air Conditioning maintains its low P/E on the weakness of its sliding earnings over the medium-term, as expected. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. If recent medium-term earnings trends continue, it's hard to see the share price moving strongly in either direction in the near future under these circumstances.

Before you settle on your opinion, we've discovered 1 warning sign for Songz Automobile Air Conditioning that you should be aware of.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.