P02FF: Propulsion System Inactive Timer Performance

What it means

The timer that monitors how long the propulsion system has been inactive (used by hybrid and stop-start strategies to schedule rebalancing tasks) is not behaving plausibly — typically a clock or PCM-state fault.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The propulsion system inactive timer tracks how long the vehicle's propulsion system has been off, information used by some hybrid and stop-start strategies to schedule system tasks. The control module checks whether the timer's state and elapsed time are plausible, and this code sets when the reported timing does not match expected operation.

Common causes

Most likely first.

1. Control module timer or clock fault
2. Low or unstable module power supply
3. Software or configuration fault

Symptoms

• Check engine light on
• Stop-start or hybrid system may be unavailable
• Warning message or propulsion-system warning light

How to diagnose it

1. Record freeze-frame data and note any hybrid, stop-start, or propulsion warnings present when the code was stored.
2. Check battery and module supply connections for looseness, corrosion, or signs of unstable power that could reset the timer.
3. Use a scan tool to compare the timer or inactive-time data with the vehicle's actual key-off and restart sequence.
4. Check for related low-voltage, clock, or communication codes that could point to a shared power or module-state problem.
5. If power and related signals are sound, verify module software and configuration using the manufacturer's diagnostic procedure.

Common fixes

• Clean and secure the affected module power and ground connections.
• Correct a weak or unstable supply battery or charging issue identified during diagnosis.
• Update or restore module software or configuration when the manufacturer's procedure calls for it.
• Repair or replace a module with a confirmed internal timer or clock fault.

Can I keep driving?

If the vehicle drives normally and no propulsion warning indicates reduced operation, a short necessary trip may be possible, but stop-start or hybrid functions may be unavailable. Follow any vehicle warning message and avoid relying on those functions until the timer fault is resolved.