An off-duty Chicago police officer is accused of firing multiple gunshots at another officer who tried to pull him over on suspicion of drunken driving.

The 52-year-old officer, whose name was not released, was driving his personal vehicle about 4 p.m. Sunday with another off-duty Chicago cop in the passenger seat when they were stopped by Merrionette Park police.

The Merrionette Park officer ordered the driver out of the car, saying he had been driving erratically, but the Chicago cop drove away.

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The suburban officer called 911 and followed the vehicle until it stopped at an intersection near the Morgan Park District police station — where the off-duty officer was assigned.

The off-duty officer got out of his vehicle with a gun in his hand and approached the Merrionette Park officer, police said.

The Merrionette Park officer ducked and drove off as the off-duty officer fired about five shots at the police cruiser, investigators said.

The off-duty officer was later arrested on suspicion of driving under the influence, and he likely will face additional charges.

The officer’s arrest powers were stripped while the investigation is under way.

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“If the allegations are true, the actions and behavior demonstrated by this officer are beyond unacceptable, have absolutely no place in our department and he will be separated from CPD,” the Chicago Police Department said in a statement.