P2610: An unreliable off timer can distort a cold-soak diagnosis

P2610 concerns the ECM/PCM’s estimate of how long the engine has been off. Ford distinguishes P2610_61 for a signal-calculation failure from P2610_62 for a signal-comparison failure. Neither label is simply a declaration that a temperature sensor reads incorrectly.

The timer is checked through more than one inconsistency

The source lists an inferred soak paired with an off time below 30 seconds, timer accuracy differing by more than 15 seconds, and an off-time CAN message missing at startup. These are distinct ways for elapsed-time information to become unreliable.

Monitoring occurs within entry conditions, with registration immediately at startup or after five minutes. A startup communication problem and an accumulated accuracy mismatch therefore need not appear at the same instant.

Why this matters beyond the clock itself

Ford’s ambient-temperature plausibility monitor lists P2610-related timer health among its prerequisites and uses a long engine-off soak condition. If the timer information is suspect, a temperature comparison cannot automatically be interpreted as though a valid soak had been established.

Preserve the full subtype, reported elapsed time, startup message availability and the operating sequence that preceded the fault. The summary does not identify a failed clock component or recommend PCM replacement. Vehicle-specific verification must establish which timer input or comparison failed before blaming a temperature sensor or drawing conclusions from an assumed overnight cool-down.

Source and applicability

Ford 2024–2025 gasoline OBD summary, July 16, 2024 revision; only the described monitor and architecture. Model, engine and calibration fitment are not inferred. The monitor explanation does not identify a failed part or replace the applicable service procedure. Ford PDF, page 120. Ford PDF, page 129.