P0868 Transmission computer sees fluid pressure lower than it should be

Transmission fluid pressure low

P0868 in short

P0868 means the transmission computer measured fluid pressure lower than it needs to clamp clutches or drive a CVT. Causes include low or leaking fluid, a pump losing prime and internal CVT faults. Treat it seriously: have it inspected soon, and do not take long trips until it is checked.

An automatic transmission or CVT works on hydraulic pressure. A pump builds it, and a pressure sensor tells the transmission computer what it is. P0868 means the measured pressure is lower than expected.

Nissan sets out a CVT repair flow chart for P0868 on 2019 Sentra, Versa and Versa Note, and notes hesitation or reduced power. On some 2022–2023 Ram heavy-duty trucks, Ram pairs P0868 with P0944 (loss of pump prime) and tells technicians not to replace the torque converter or internal parts for it.

Low fluid is the first thing to rule out. After that, follow the maker's procedure rather than replacing parts.

Most likely causes

  1. Low, leaking or dirty transmission fluid

    Common general cause
    Why it ranks here
    General references list low or contaminated fluid first for transmission pressure codes, because the pump cannot build pressure without enough clean fluid.
    What would change this
    Rises if there is a leak or the fluid is low, dark or smells burnt.

  2. Pump losing prime (Ram heavy-duty with P0944)

    Supported by vehicle data
    Why it ranks here
    Ram links P0868 with P0944 loss of hydraulic pump prime on 2022–2023 Ram 2500/3500 and points to the pump and reaction shaft.
    What would change this
    Rises on a covered Ram that also has P0944 stored.

  3. CVT fault (2019 Nissan Sentra and Versa)

    Supported by vehicle data
    Why it ranks here
    Nissan sends P0868 on these cars to a CVT repair flow chart.
    What would change this
    Rises on a covered Nissan with hesitation or reduced power.

  4. Fluid pressure sensor or its wiring reading wrong

    Possible — needs testing
    Why it ranks here
    The code is set from a sensor reading, and general references list a faulty pressure sensor or wiring among the causes.
    What would change this
    Rises if a pressure sensor circuit code is also stored, or a gauge shows normal pressure while the sensor reads low.

What to test first

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

  1. Read codes from the engine and transmission modules with a scan tool that supports both, before anything is cleared. Note every code, not just this one.

    Low riskTool: scan tool that reads the transmission module

  2. Check the transmission fluid level and look for leaks, following the owner's manual. If there is no dipstick, have a shop check the level.

    Use caution

    Warning:The engine often has to be running and the transmission hot for a correct reading. Keep hands clear of moving parts and hot exhaust. Many newer transmissions have no dipstick and need a shop.

  3. Check for a P0868 bulletin or software update for your VIN at a dealer or on the NHTSA site.

    Low risk

  4. Have a transmission shop compare the pressure sensor reading with a mechanical gauge and check pump output.

    Best left to a shopTool: scan tool with transmission data and output controls

    Warning:Shop test. It is done while driving or on a lift, often with pressure gauges, and needs the maker's procedure.

Symptoms

  • Check engine light
  • Hesitation or reduced power Gets more serious: stop and have it checked.
  • Slipping, or failure to shift or move Gets more serious: stop and have it checked.
  • Transmission running hot

Compare with: Check engine light with loss of power

How to fix

  1. Do not clear the code before the transmission module has been read.

  2. Check for fluid leaks under the car and have the fluid level checked.

  3. Ask a dealer whether your VIN has an open P0868 bulletin. Nissan and Ram have issued them.

Parts and cost context

  • Transmission control module (TCM):P0868 is rarely the module itself. Ram tells technicians not to replace the torque converter or internal parts when P0944 and P0868 appear together; follow the bulletin.

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

Compare used part prices on PartPriceGuide

On your vehicle

Nissan

  • 2019 · Sentra

    Supported by vehicle data

    Nissan NTB19-068 covers P0868 with hesitation or reduced power and sends it to a CVT repair flow chart. The Versa and Versa Note are also covered. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Inside the CVT

  • NTB19-068Status unverified

    MIL on with P0868, may hesitate or lack power

    2019sentra, versa, versa-note · issued · NHTSA 10165781

    The MIL is on with P0868 (fluid pressure low), and the car may hesitate or have reduced power. Refers to a CVT repair flow chart. A later amendment (NTB19-068a) points to newer bulletins. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

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

Ram

  • 2022–2023 · 2500

    Supported by vehicle data

    Ram S2321000007 covers P0868 with P0944 loss of pump prime, and 9100202 says not to replace the torque converter or internal parts for it. The 3500 is also covered. The bulletins are on NHTSA, but whether they are still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Transmission pump

  • S2321000007Status unverified

    MIL with P0944 loss of pump prime and P0868 fluid pressure low

    2022–20232500, 3500 · issued · NHTSA 10243164

    Covers the MIL with both codes set. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

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

  • 9100202Status unverified

    Pump assembly and reaction shaft, P0944 and P0868

    20232500, 3500 · issued · NHTSA 10243098

    If both codes are present, do not replace the torque converter or internal transmission parts; refer to S2321000007. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

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

  • P0700Transmission module requests the check engine light

    Primary / secondary Possible — needs testing

    Likely primary: P0868. On cars with a separate transmission module, a basic code reader may show only P0700, which means the module has stored its own code. P0868 can be that code, so fix P0868 and P0700 goes with it.

  • P0841Transmission fluid pressure sensor or switch reading does not make sense

    Same system Possible — needs testing

    Both come from the transmission fluid pressure sensing: P0841 is about the sensor or switch reading, P0868 about pressure being low.

All Transmission codes

P0868 questions

Is P0868 serious?

Yes, treat it seriously. Without enough pressure, clutches can slip. General references advise against long drives with it, and Toyota tells owners to get the car checked right away when the light is on for the transmission.

Can low fluid cause P0868?

Yes. Low or leaking fluid is the first thing to check, because the pump cannot build pressure without it.

Does P0868 mean a new transmission?

Not necessarily. Ram tells technicians not to replace the converter or internal parts when P0868 comes with P0944, and Nissan uses a repair flow chart.

Sources and review

  1. Toyota Camry Owner's Manual (OM06291U) — Toyota
  2. Cal. Code Regs. Tit. 13, § 1968.2 — Malfunction and Diagnostic System Requirements (OBD II) — California Air Resources Board (via Cornell LII)
  3. P0868 Code: Definition and Details — Kelley Blue Book
  4. Nissan NTB19-068: MIL on with P0868, may hesitate or lack power — Nissan North America / NHTSA ,
  5. FCA S2321000007: MIL with P0944 loss of hydraulic pump prime and P0868 fluid pressure low — FCA US LLC / NHTSA ,
  6. FCA 9100202: Pump assembly and reaction shaft, P0944 and P0868 — FCA US LLC / NHTSA ,
  7. DTC P0700 — Saab 9-5 (9650) 2010 Workshop Information System — SaabWISOnline (community rehost of Saab/GM service information)
  8. P0841 Code: Definition and Details — Kelley Blue Book
Last reviewed
Written by
Saurabh K.
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