P061B Engine computer’s internal torque calculation check failed

Internal control module torque calculation performance

P061B in short

P061B means the engine computer’s internal check of its own torque calculation failed, and you may notice a lack of power. Software that needs an update is the most common fix in Ford and Mazda bulletins, ahead of power-supply problems or a failed computer. Get it checked soon, especially if power drops.

The engine computer continuously works out how much torque the engine is producing and cross-checks that figure internally. Mazda describes P061B as a torque calculation performance problem inside the computer; when the cross-check fails, the code is stored.

On Mazda models the problem was often the check itself: the logic was too sensitive, or the error grew in high heat at high altitude, and the car felt short of power. Mazda’s fix is updated software.

Ford has updates or repairs for P061B on 2005 F-150 5.4L trucks and Crown Victoria Police Interceptors (often with P2106), 2006 E-Series vans and 2023 Super Duty trucks. On 2020–2022 Police Interceptor Utility hybrids, added police equipment powered from the wrong source caused it.

Most likely causes

  1. Engine computer software that needs an update

    Supported by vehicle data
    Why it ranks here
    Mazda (two bulletins) and Ford (2005 F-150, Crown Victoria Police Interceptor, 2023 Super Duty) fix P061B with engine computer software. It is the fix in most bulletins found.
    What would change this
    Rises if a dealer finds an update for your VIN. Falls if the software is current and the code returns.

  2. Power supply problems from added electrical equipment or a weak battery

    Possible — needs testing
    Why it ranks here
    Ford SSM 50354 traces P061B on Police Interceptor Utility hybrids to police equipment wired to the 12-volt batteries or used with the engine off. Outside that fleet it is less documented, so it ranks below software.
    What would change this
    Rises if aftermarket equipment is wired to the battery or the battery tests weak. Falls if there is no added equipment and the battery is good.

  3. Low-speed drivability calibration (2006 E-Series 5.4L)

    Supported by vehicle data
    Why it ranks here
    Ford bulletin 08-4-6 covers a downhill engine buck with speed control on, low-speed drivability concerns and P061B on 2006 E-Series 5.4L vans.
    What would change this
    Rises on that van with those symptoms. Falls on other vehicles.

What to test first

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

  1. Read all stored codes and freeze-frame data, and note whether P2106 or network codes are stored with P061B.

    Low riskTool: OBD-II scan tool

  2. Ask a dealer whether your VIN has an engine computer update or bulletin for P061B.

    Low risk

  3. Test the battery and charging system, and check whether any aftermarket equipment is wired directly to the 12-volt battery.

    Low riskTool: battery tester or multimeter

Symptoms

  • Check engine light, sometimes with a lack of power
  • Engine bucking with cruise control on downhill, or rough low-speed driving (2006 E-Series)
  • Code appears after a cold start and quick shift into gear (2005 F-150 5.4L)

Compare with: Check engine light with loss of power

How to fix

  1. Ask a dealer whether your VIN has an engine computer update for P061B.

  2. If you have added electrical equipment, have a shop check that it is wired to an approved power point and not straight to the battery.

Parts and cost context

  • Engine control module (ECM / PCM):Every bulletin found fixes P061B with software or wiring of added equipment, not a new computer. 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

Mazda

  • 2013–2019 · CX-5

    Supported by vehicle data

    Mazda bulletins update the PCM software for P061B with lack of power, including a high-heat, high-altitude case. Whether the bulletin is still current is not verified.

  • 01-021-18-3514aStatus unverified

    Lack of power with P061B:00 at high temperature and altitude

    2013–2018cx-5 · issued · NHTSA 10148007

    The torque calculation error grows in high heat at high altitude; PCM software modified.

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

  • 01-015-19-3626Status unverified

    Lack of power with P061B:00, detection too sensitive

    2018–2019mazda6, cx-5, cx-3 · issued · NHTSA 10163824

    Torque calculation error detection was too sensitive; PCM software modified.

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

Ford

  • 2005 · F-150

    Supported by vehicle data

    On early-build 5.4L 3V trucks, Ford bulletin 0546 covers P061B and P2106 after a cold start with quick gear engagement. Whether the bulletin is still current is not verified.

  • 0546Status unverified

    MIL with P061B and/or P2106 after cold start and rapid gear engagement (5.4L 3V)

    2005f-150 · issued · NHTSA 10018053

    Trucks built 23 August 2004 through 15 January 2005.

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

  • 07226Status unverified

    MIL with P2106 and P061B (Police Interceptor)

    2005–2008crown-victoria · issued · NHTSA 10023864

    Police Interceptors built before 19 October 2007.

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

  • 08-4-6Status unverified

    Downhill engine buck with speed control, low-speed drivability and/or P061B (5.4L)

    2006e-series · issued · NHTSA 10024822

    Engine buck with speed control engaged and low-speed drivability concerns.

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

  • TSB 23-2421Status unverified

    P061B, U0140, U3035 and/or U3036: reprogram PCM (6.8L, 7.3L)

    2023f-250-super-duty, f-350-super-duty · issued · NHTSA 10248365

    PCM software; reprogram the PCM.

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

  • SSM 50354Status unverified

    P061B from added police equipment (Police Interceptor Utility hybrid)

    2020–2022explorer · issued · NHTSA 10205485

    Equipment should use the rear power access point, not the 12-volt cranking or auxiliary batteries.

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

  • P2106The engine computer has limited engine power as a fail-safe because of a throttle control fault

    Shares causes Supported by vehicle data

    Ford bulletins cover P061B and P2106 together on early 5.4L 3V F-150s after a cold start with quick gear engagement, and on the Crown Victoria Police Interceptor.

  • U0401A module received invalid data from the engine or powertrain computer

    Shares causes Supported by vehicle data

    Mazda's bulletin pairs P061B with U0401 and a lack of power when engine cranking is interrupted.

  • U0140Lost communication with the body control module

    Shares causes Supported by vehicle data

    Ford TSB 23-2421 reprograms the engine computer for P061B with U0140, U3035 and/or U3036 on 6.8L and 7.3L engines.

  • P0733Transmission computer sees the wrong speed ratio in third gear

    Shares causes Supported by vehicle data

    Jeep's bulletin flashes the transmission computer for a check engine light with P0733, P061B and P1DB8.

All Engine computer (ECM/PCM) codes

P061B questions

Does P061B mean my engine computer is bad?

Usually not. Ford and Mazda bulletins fix it with software, and on police hybrids with correct wiring of added equipment. Check for updates first.

Sources and review

  1. Mazda bulletin 01-021-18: lack of power with P061B:00 at high temperature and altitude — Mazda North American Operations / NHTSA ,
  2. Mazda bulletin 01-015-19: lack of power with P061B:00, torque calculation detection too sensitive — Mazda North American Operations / NHTSA ,
  3. Ford TSB 08-4-6: downhill engine buck with speed control, low-speed drivability and/or P061B (2006 E-Series 5.4L) — Ford Motor Company / NHTSA ,
  4. Ford TSB 0546: MIL with P061B and/or P2106 after cold start and rapid gear engagement (2005 F-150 5.4L 3V) — Ford Motor Company / NHTSA ,
  5. Ford TSB 07226: MIL with P2106 and P061B (Crown Victoria Police Interceptor built before 10/19/2007) — Ford Motor Company / NHTSA ,
  6. Ford TSB 23-2421: P061B, U0140, U3035 and/or U3036, reprogram PCM (2023 Super Duty 6.8L, 7.3L) — Ford Motor Company / NHTSA ,
  7. Ford SSM 50354: P061B and drivability concerns from added police equipment (2020–2022 Police Interceptor Utility hybrid) — Ford Motor Company / NHTSA ,
  8. Mazda 01-015-18: Lack of power, check engine light, P061B:00 and U0401:00 — Mazda North American Operations / NHTSA ,
  9. FCA 21-027-14: TCM flash for MIL with P0733, P061B, P1DB8, 2014–2015 Cherokee — FCA US LLC / NHTSA ,
Last reviewed
Written by
Saurabh K.
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