P1285 Cylinder head temperature above the engine computer’s limit (Ford, Lincoln, Ford-built Mazda)

Cylinder head over temperature (CHT sensor)

P1285 in short

On Ford, Lincoln and Ford-built Mazda engines, P1285 means the cylinder head temperature sensor has read hotter than the engine computer allows. Coolant loss, a coolant leak into the engine or a blocked coolant passage is the usual cause, though some trucks have a faulty sensor. Pull over safely and stop the engine.

Many Ford engines measure engine heat with a cylinder head temperature (CHT) sensor fitted in the cylinder head. When that reading climbs past the computer’s limit it sets P1285, usually with P1299 stored alongside, and the temperature gauge or an over-temperature message often warns the driver at the same time.

Ford’s bulletins tie P1285 mostly to coolant problems: coolant leaking into the cylinders on some 2.0L and 1.5L EcoBoost engines, a leaking EGR cooler on 2019–2020 2.0L models, and machining chips blocking a coolant passage near the sensor in some 2023–2024 Escape cylinder heads.

Not every P1285 means the engine truly got hot. Ford’s 2024–2025 F-150 2.7L bulletin replaces the CHT sensor with an updated part, Mazda describes the Tribute’s sensor reporting hot when the engine is cold, and a 2019 Edge and Nautilus bulletin fixes it with software. Only testing can tell which case you have.

Pick your make

P1285 is a manufacturer-specific code: its meaning depends on who built the car.

Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.

Most likely causes

  1. Low coolant from a leak

    Common general cause
    Why it ranks here
    Ford’s bulletins for P1285 repeatedly start from a low coolant level, and an engine short of coolant runs hot. Low coolant is also the first thing an owner can check safely once the engine has cooled.
    What would change this
    Rises if the reservoir is below the minimum mark or there are wet spots or crusty residue around hoses and the radiator. Falls if the coolant stays full and the system holds pressure.

  2. Coolant leaking into the cylinders (some 2.0L and 1.5L EcoBoost engines)

    Supported by vehicle data
    Why it ranks here
    Ford bulletins 19-2172 (2015–2019 Edge, Fusion, Escape, MKZ, MKC 2.0L) and 19-2375 (2014–2019 Fusion and 2017–2019 Escape 1.5L) list P1285 with low coolant, white exhaust smoke, rough running and misfire codes, and blame coolant getting into the cylinders.
    What would change this
    Rises with white exhaust smoke, coolant loss with no outside leak, and P0300–P0304 stored. Falls if a cooling-system pressure test and a cylinder leak test are both clean.

  3. EGR cooler leaking coolant (2019–2020 2.0L EcoBoost)

    Supported by vehicle data
    Why it ranks here
    Ford SSM 48345 covers 2019–2020 Edge, Escape, Nautilus and Corsair 2.0L with P1285, an over-temperature warning and white smoke, and tells technicians to inspect the EGR cooler first.
    What would change this
    Rises on these models if P0401 or P2196 is stored too and coolant is being lost with white smoke. Falls if the EGR cooler pressure-tests tight.

  4. Coolant passage near the CHT sensor blocked by machining chips (2023–2024 Escape 1.5L)

    Supported by vehicle data
    Why it ranks here
    Ford SSM 52219 covers 2023–2024 Escape 1.5L built on or before 11 January 2024 that show an over-temperature warning with P1285 under hard acceleration or heavy load, caused by chips trapped in the cylinder head.
    What would change this
    Rises on an early-build 2023–2024 Escape 1.5L when the warning appears only under load with a full cooling system. Falls on other models or later build dates.

  5. Faulty CHT sensor reading or engine computer software

    Supported by vehicle data
    Why it ranks here
    Ford replaces the CHT sensor with an updated part on 2024–2025 F-150 2.7L trucks, Mazda describes the Tribute sensor reporting hot when cold, and Ford fixed 2019 Edge and Nautilus 2.0L with a software update. It ranks below coolant faults because those bulletins are model-specific.
    What would change this
    Rises if the coolant is full, there is no smoke or coolant loss, and the CHT reading does not match how hot the engine actually is. Falls if the engine genuinely runs hot.
    How to test the cylinder head temperature (cht) sensor

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Once the engine has fully cooled, check the coolant level in the reservoir and look under the car and around the engine for drips, wet hoses or dried white or coloured residue.

    Use caution

    Warning:Never open the radiator or reservoir cap while the engine is hot. Steam and hot coolant can scald.

    • IfThe coolant is low and you can see a leak

      It meansThe engine is losing coolant from outside.

      Points to: Low coolant from a leak

    • IfThe coolant is low but there is no visible leak, or there is white exhaust smoke

      It meansCoolant may be going into the engine.

      Go to step 3

    • IfThe coolant is full with no leak or smoke

      It meansCheck for a bulletin that covers your vehicle.

      Go to step 2

  2. Ask a Ford or Lincoln dealer whether your VIN is covered by a bulletin or program for P1285. Ford has issued them for the Escape, Edge, Fusion, Nautilus, Corsair and F-150.

    Low risk

  3. Have a shop pressure-test the cooling system and check whether coolant is getting into the cylinders or through the EGR cooler.

    Best left to a shopTool: cooling system pressure tester, cylinder leak-down tester

    Warning:This work involves a pressurised hot cooling system and engine internals. Let a shop do it.

Symptoms

  • Temperature gauge reading hot, or an Engine Over-Temperature message Gets more serious: stop and have it checked.
  • Steam from under the hood or sudden loss of power Gets more serious: stop and have it checked.
  • White exhaust smoke or a coolant level that keeps dropping Gets more serious: stop and have it checked.
  • Rough running or misfiring, sometimes with misfire codes Gets more serious: stop and have it checked.
  • Air conditioning stops blowing cold (noted on the 2003 Focus)

How to fix

We don't give DIY repair steps for a Stop code. Get the car inspected before you drive it; the tests above help you understand what a technician will check.

Parts and cost context

  • Cylinder head temperature (CHT) sensor:Ford’s F-150 2.7L bulletin calls for an updated sensor. On other models replace it only after coolant loss and leaks are ruled out. Labour varies; get a quote.
  • engine block:The coolant intrusion bulletins for some 2.0L and 1.5L EcoBoost engines replace the long block or short block. Ask a dealer about warranty or program coverage for your VIN before paying. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Ford

  • 2017–2019 · Escape

    Supported by vehicle data

    On the 1.5L and 2.0L EcoBoost, Ford bulletins 19-2375 and 19-2172 link P1285 to coolant leaking into the cylinders, with white smoke and misfires. Whether the bulletin is still current is not verified.

  • 2023–2024 · Escape

    Supported by vehicle data

    On early-build 1.5L models (built on or before 11 January 2024), SSM 52219 blames machining chips blocking a coolant passage near the CHT sensor; the warning shows under hard acceleration. Whether the bulletin is still current is not verified.

  • 2015–2020 · Edge

    Supported by vehicle data

    Edge 2.0L bulletins cover coolant intrusion (2015–2018), a PCM software update (2019) and a leaking EGR cooler (2019–2020). Whether the bulletin is still current is not verified.

  • 2014–2019 · Fusion

    Supported by vehicle data

    Fusion 1.5L and 2.0L EcoBoost bulletins link P1285 to coolant intrusion into the cylinders. Whether the bulletin is still current is not verified.

  • 2024–2025 · F-150

    Supported by vehicle data

    On the 2.7L, TSB 26-2217 replaces the CHT sensor with an updated version when P1285 sets with an over-temperature message. Whether the bulletin is still current is not verified.

  • 17126Status unverified

    MIL with P1285 and/or P1299, hot gauge or A/C inoperative

    2003focus · issued · NHTSA 10004047

    P1285 and/or P1299 (cylinder head over temperature) with the coolant gauge reading hot or the A/C not working.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB 19-2172Status unverified

    Low coolant, white smoke, runs rough: coolant intrusion (2.0L EcoBoost)

    2015–2019escape, edge, fusion · issued · NHTSA 10162062

    2015–2018 Edge and 2015–2019 Fusion, Escape, MKZ and MKC 2.0L with P1285, P1299 and misfire codes from coolant getting into a cylinder.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB 19-2375Status unverified

    Coolant intrusion, short block replacement (1.5L EcoBoost)

    2014–2019fusion, escape · issued · NHTSA 10169884

    2014–2019 Fusion and 2017–2019 Escape 1.5L with low coolant, white smoke, rough running and P1285, P1299 or misfire codes. Supersedes 19-2139.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • SSM 48345Status unverified

    EGR cooler leaking coolant (2.0L EcoBoost)

    2019–2020edge, escape · issued · NHTSA 10168812

    Low coolant, white smoke, over-temperature warning and P1285 or related codes; inspect the EGR cooler first. Also covers Lincoln Nautilus and Corsair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB 19-2046Status unverified

    PCM software update (2.0L EcoBoost)

    2019edge · issued · NHTSA 10155555

    Edge and Lincoln Nautilus built on or before 23 January 2019 with P1285, P1299 and other codes; update the PCM software.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • SSM 52219Status unverified

    Over-temperature warning with P1285/P1299 (1.5L)

    2023–2024escape · issued · NHTSA 10249778

    Escape 1.5L built on or before 11 January 2024; machining chips may block a coolant passage near the CHT sensor.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB 26-2217Status unverified

    P1299, P1285 and/or P2C39 with Engine Over-Temperature message

    2024–2025f-150 · issued · NHTSA 11032695

    Diagnose and replace the CHT sensor with an updated version. Supersedes 24-2441.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0300Random or multiple-cylinder misfire detected

    Shares causes Supported by vehicle data

    On 2.0L and 1.5L EcoBoost engines, Ford lists P0300–P0304 with P1285 when coolant leaks into the cylinders.

  • P0128Engine coolant stays below thermostat temperature

    Shares causes Supported by vehicle data

    Mazda’s Tribute bulletin and Ford’s 2019 Edge and Nautilus software bulletin list P0128 alongside P1285 when the temperature reading is wrong.

  • P0401Exhaust gas recirculation (EGR) flow insufficient detected

    Shares causes Supported by vehicle data

    Ford SSM 48345 lists P0401 with P1285 when a 2019–2020 2.0L EGR cooler leaks coolant.

  • P0217The engine computer has detected an engine over-temperature condition

    Shares causes Supported by vehicle data

    Ford's 1.5L and 2.0L EcoBoost coolant intrusion bulletins list P1285 with P0217, P1299 and misfire codes.

  • P0316A misfire was detected during the first 1,000 engine revolutions after start-up

    Shares causes Supported by vehicle data

    Ford's 1.5L EcoBoost coolant intrusion bulletin lists P1285 with P0316, P1299 and P0300-P0304, along with low coolant, white smoke and rough running.

  • P1299Ford and Lincoln: cylinder head over-temperature protection is active (the engine computer's fail-safe cooling mode)

    Same system Supported by vehicle data

    Ford and Lincoln usually store P1299, the cylinder head over-temperature protection code, alongside P1285, and many Ford bulletins cover the two together.

All Engine cooling (thermostat) codes

P1285 questions

Can I keep driving with P1285?

No. Pull over safely and switch off. Ford pairs this code with overheating warnings, and driving an overheating engine can ruin it. Have it towed if the coolant is low or the gauge is hot.

Does P1285 always mean my engine overheated?

Not always. Some F-150, Tribute, Edge and Nautilus bulletins fix it with a new sensor or software. A shop has to confirm the coolant and cooling system are healthy first.

My Escape or Fusion keeps losing coolant with P1285. What should I ask the dealer?

Ask whether the coolant intrusion bulletins (19-2172 or 19-2375) or an extended coverage program apply to your VIN.

Sources and review

  1. Ford TSB 17126: MIL with P1285 and/or P1299 (cylinder head over temperature), hot gauge or A/C inoperative (2003 Focus) — Ford Motor Company / NHTSA ,
  2. Ford SSM 52219: 1.5L over-temperature warning with P1285/P1299 (2023–2024 Escape) — Ford Motor Company / NHTSA ,
  3. Ford TSB 26-2217: P1299, P1285 and/or P2C39 with Engine Over-Temperature message (F-150 2.7L) — Ford Motor Company / NHTSA ,
  4. 2023 Integra Owner's Manual: How to Handle Overheating — American Honda Motor Co.
  5. Ford TSB 19-2172: 2.0L EcoBoost low coolant, white smoke, runs rough, coolant intrusion into cylinder — Ford Motor Company / NHTSA ,
  6. Ford SSM 48345: 2.0L EcoBoost EGR cooler leaking coolant (2019–2020 Edge, Escape, Nautilus, Corsair) — Ford Motor Company / NHTSA ,
  7. Ford TSB 19-2375: 1.5L EcoBoost coolant intrusion (2014–2019 Fusion, 2017–2019 Escape) — Ford Motor Company / NHTSA ,
  8. Mazda bulletin 01-005-20: MIL with P1285, P1299 and/or P0128, incorrect CHT sensor reading (Tribute) — Mazda North American Operations / NHTSA ,
  9. Ford TSB 19-2046: PCM software update, 2.0L EcoBoost (2019 Edge, Nautilus) — Ford Motor Company / NHTSA ,
  10. Ford TSB 20-2100: Coolant intrusion on 1.5L EcoBoost - low coolant, white smoke, rough running, P0300-P0304, P0316, P0217, P1285, P1299 — Ford Motor Company / NHTSA ,
  11. Ford TSB 012111: engine overheating with P1285 and P1299 (2001–2002 LS, Thunderbird) — Ford Motor Company / NHTSA ,
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Written by
Saurabh K.
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