P2610: ECM/PCM Internal Engine Off Timer Performance
Key takeaways
- P2610 means the engine computer's internal timer, which measures how long the engine has been off, didn't agree with the reference it checks against.
- The car usually drives normally; the main effect is that some emissions self-tests can't run, which can fail an inspection.
- Battery work, low battery voltage or a removed fuse are the most common triggers, and a software update is the next most common fix.
- Chrysler, Dodge, Jeep and Ram bulletins for P2610 are computer software updates; Mazda's cover the code setting after a fuse was pulled.
- Most fixes cost between nothing (clear the code) and a $100–$200 software update; a new engine computer is rare.
What P2610 means
Your engine computer’s “how long was the car off” clock doesn’t agree with a second opinion. The engine computer keeps an internal timer running after you shut the car off, because several self-tests need to know how long the engine has been sitting: the evaporative (fuel vapor) leak test and cold-start checks are the usual examples. At the next start, it compares that timer with another reference, such as the instrument cluster’s clock or how far the coolant has cooled. If the two don’t line up, it stores P2610, “ECM/PCM Internal Engine Off Timer Performance.” On some makes the scanner names the instrument cluster timer instead, but the meaning is the same.
Is it safe to drive?
Yes. P2610 doesn’t change how the engine runs on almost every car. The practical cost is that self-tests depending on the timer may not run, so readiness monitors can stay incomplete and the car can fail an emissions inspection. The symptom that changes the answer: if P2610 comes with slow cranking, flickering lights, a battery warning or the car stalling, the real problem is voltage, and a car with a failing charging system can leave you stranded. In that case keep trips short and get the battery and alternator tested.
Causes, ranked
| Cause | How you confirm it | Typical cost (US independent shop, 2026) |
|---|---|---|
| Battery recently disconnected, replaced or run flat, or a fuse pulled | Code appeared right after battery or fuse work; clear it and it stays off | $0 |
| Weak battery or loose, corroded terminals | Battery load test; voltage drops at the terminals | $20–$120 for terminals, $150–$350 for a battery |
| Engine computer software | A bulletin covers your make, model and year | $100–$200 |
| Poor ground or power feed to the engine computer | Voltage drop test at the computer’s power and ground pins | $100–$250 |
| Failed engine computer | Everything above checks out and the code keeps returning | $800–$1,800 plus programming |
What to check first
- Think back. Battery replaced, jump-started, run flat, or a fuse pulled in the last few days? Clear the code and drive normally for a week.
- Test the battery and charging system. Many parts stores do it free. Clean and tighten both battery terminals and the ground straps.
- Look for a bulletin. The pattern is software. Chrysler, Dodge, Jeep and Ram have computer reflash bulletins that list P2610 on vehicles such as the 2020 Jeep Cherokee and Wrangler, the 2020 Ram 1500 and 2016 Chrysler 300 and Dodge Challenger. Mazda has bulletins on the Mazda6, CX-3 and CX-9 where P2610 and P2507 are stored after the 15A ROOM fuse has been removed.
- Check for other voltage codes like P0562 or P0560. If they’re present, fix the voltage first.
- Only then suspect the computer. Replacing it is rarely the answer to this code.
Just 7 complaints filed with NHTSA mention P2610, spread across 7 models. That fits what we see: it’s an annoying light far more often than a breakdown.
What it costs
The cheap outcome costs nothing: the code was left behind by battery work and clearing it is the fix. The common outcome is a software update at $100–$200, often free if the car is under warranty or covered by a bulletin, or a battery at $150–$350. The expensive outcome is a new engine computer at $800–$1,800 plus programming, which a proper diagnosis almost always rules out. If you’re unsure how to clear it, see how to reset the check engine light.
Related codes
P2610 often appears with voltage codes such as P0562 (system voltage low) or P0560, and on Mazdas with P2507. If the battery keeps dying, solve that first.
What owners report to NHTSA
7 complaints filed with NHTSA mention P2610, 5 of them since 2015, across 7 different models. The component owners most often filed it under: electrical system.
Manufacturer service bulletins that name P2610
221 technical service bulletins and manufacturer communications filed with NHTSA mention P2610, from 12 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- MAZDA MAZDA6 (2014, 2015, 2016, 2017), bulletin 10186696: Some vehicles may experience the CHECK ENGINE LIGHT ON with DTC P2610 and P2507 stored in memory after engine start and room fuse 15A (A) removed. P2610:00: Instrument cluster internal engine off timer performance proble…
- MAZDA CX-9 (2016, 2017, 2018, 2019), bulletin 10170813: Some vehicles may experience the CHECK ENGINE LIGHT ON with DTC P2610 and P2507 stored in memory after engine start and room fuse 15A (A) removed. P2610:00: Instrument cluster internal engine off timer performance proble…
- JEEP CHEROKEE (2020), bulletin 10180288: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
- JEEP WRANGLER (2020), bulletin 10187705: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
- RAM 1500 (2020), bulletin 10198439: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further inves…
- CHRYSLER 300 (2016), bulletin 10180280: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with updated software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the …
Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.
Frequently asked questions
What causes P2610?
Most often a battery that was disconnected, replaced or ran low, which upsets the computer's timekeeping. Next is software that needs an update. A failed engine computer is possible but uncommon.
Can I just clear P2610?
Yes, it's reasonable to clear it once, especially after battery work, and see if it returns over the next several drives. If it comes back, check the battery and charging system and ask about a software update.
Will P2610 fail an emissions test?
It can. With the check engine light on, most inspection stations fail the car, and the timer is used by some self-tests, so readiness monitors may not complete until it's fixed.
Is P2610 serious?
Usually not. It rarely affects how the car drives. Treat it as a sign to check the battery and ask about software, not as an emergency.