"Single bit ECC" error is caused by a transient hardware memory error.

"ECC" stands for Error Checking and Correction, which permits error detection as well as correction of specific errors.

"CPQ" stands for chunk point queue

when cpq dram single bit error encountered, following messages reported:

Jan 27 03:27:57 2024 Router : %PFE-3: fpc13 XMCHIP(3): XMCHIP(3): CPQ0: DRAM ECC error summary indication for CPQ interface 0 (1X32 DMC 1 DDR 1) - Logical DRAM Bank 0, Logical Address 0x82d4a

Jan 27 03:27:57 2024 Router : %PFE-3: fpc13 XMCHIP(3): XMCHIP(3): CPQ0: DRAM single bit ECC error for CPQ interface 0 (1X32 DMC 1 DDR 1) - Logical DRAM Bank 0, Logical Address 0x82d4a

No action needed, single bit ecc error is corrected automatically.