For the fiscal first quarter ended December 31, the company reported a net loss of $608 million, or $1.02 per share, from $235 million profit, or 39 cents per share, a year earlier.

Revenue fell to $7.34 billion in the quarter, from $9.48 billion a year earlier.

Excluding items, Johnson Controls reported a loss of 14 cents per share. On that basis, analysts on average had expected a loss of 1 cent per share, according to Reuters Estimates.

"The market environment and uncertainties we face are expected to continue in the second quarter," Johnson Controls Chief Executive Stephen Roell said in a statement.

Parts suppliers, whose balance sheets are already strained by tighter credit and plunging auto production, have taken a further hit in recent months by concerns about the health of their major customers.

Johnson Controls makes car interiors, seating and batteries.

(Reporting by Soyoung Kim; Editing by Derek Caney)