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OBD-II Code

P0694

Severity

Not yet reviewed

Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.

Can you drive it

We cannot say

Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.

Indicative cost (USD)

$30–$400

From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.

P0694 is Fan 2 control circuit high - an open or short-to-power on the secondary fan control wire.

How a shop works this

Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.

  1. Note every code that is set, not just this one.

    Codes that appear together usually narrow the cause faster than any one of them read alone.

  2. Read the freeze frame — the conditions the fault was recorded under.

    Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.

  3. Confirm the fault is current rather than history.

    Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.

  4. Then follow the diagnostic notes further down this page, in the order they are written.

    They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.

If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.

Common symptoms

  • Check engine light
Read the full diagnostic procedureP0694 is Fan 2 control circuit high - an open or short-to-power on the secondary fan control wire.

P0694 is Fan 2 control circuit high - an open or short-to-power on the secondary fan control wire.

Cheapest-first ladder

  1. key-on engine-off, measure the fan 2 control wire at the relay/FCM connector; it should sit at battery voltage uncommanded (12.6 V key-on, 13.8 to 14.2 V running) and drop to 0 V when the scan tool commands the fan on.
  2. If it stays at battery voltage even when commanded on, the PCM driver is open or the wire is broken between PCM and relay.
  3. Measure relay coil resistance (50 to 90 ohms); infinite reading confirms an open coil.
  4. On PWM fan 2 systems, watch the FCM input drive line with the scan tool commanding incremental duty cycle and confirm the waveform is clean; a flat-high reading at all commanded duties points to FCM internal fault or open input.
  5. Current draw at commanded fan-on should ramp from 3 A inrush to 4 to 15 A steady on a 14 to 16 inch electric fan; less than 1 A current with a healthy command waveform points to a failed fan motor (open brush or burned winding) rather than a control fault.
  6. Expensive-misdiagnosis caveat: fan resistor packs are the common consumable on multi-speed fan systems.
  7. Ford, GM, and Toyota all use 3-step fan resistor packs that burn open at the high-current stage; the failure mode that drives P0694 specifically is the pack going completely open after the high-stage solder tab unsoldered, which makes the PCM see no return current path and flag the control circuit as high/open even though the relay and PCM are both fine.
  8. Pull the pack and ohm each stage before condemning anything upstream; replace the pack, $40 to $120.
Vehicle-specific patterns2011-2014 Ford F150 5.0 Coyote single-PWM-fan setup doesn't typically throw P0694; if it does, it's an FCM internal fault and FCM replacement is the…
  • 2011-2014Ford F150 5.0 Coyote single-PWM-fan setup doesn't typically throw P0694; if it does, it's an FCM internal fault and FCM replacement is the fix, $150 to $260.
  • 2007-2014GM Silverado/Tahoe/Yukon dual-system trucks throw P0694 from the secondary fan motor failing open internally (brush wear, broken solder at commutator) - verify with current clamp on the power feed at command, $180 to $400 fan motor.
  • 2007-2017Toyota Camry V6 2GR-FE dual fan with resistor pack throws P0694 from the pack high-stage open (most common) or from the fan 2 motor brushes worn out after 150k miles; $50 to $320 depending on which.
  • 2006-2015Honda Pilot/Odyssey J35 V6 dual-fan throws P0694 from the auxiliary fan relay opening internally after road salt exposure to the underhood fuse block, $30 to $80 relay.

Estimated repair$30 to $400.

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