Toyota Fault Code

Free · no signup

P1604

Engine Cranks Long / Intermittent Stall

Variant 1

System

Starting / Engine

Symptom

Engine Cranks Long / Intermittent Stall

Diagnosis & fix steps

LOGIC: Startability Malfunction (Crank Time Exceeded / Low Start RPM). ACTION: Check starter motor cranking speed (must exceed 200 RPM). Inspect primary fuel filter primer bulb for bleeding down air into fuel lines overnight. Test glow plug resistance.

Red Seal field insights

Fuel Drainback: P1604 is an overarching startability flag; failing primer pump check valves allow fuel to drain back to the tank, causing long cranking before rail pressure builds.

Variant 2

System

Starting / System

Symptom

Engine Cranks Long / Starts and Dies

Diagnosis & fix steps

LOGIC: Startability Malfunction (Crank Time Exceeded Limits). ACTION: Test battery cold-cranking voltage (must stay >10.0V during crank). Check fuel line primer bulb firmness on diesel models; inspect for air leaks at the filter head or extended fuel drain-back.

Red Seal field insights

Catch-All Starting DTC: A historical flag stored in Toyota ECMs when engine speed fails to cross continuous idle thresholds within calibrated cranking time; points to air in fuel or weak battery voltage.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

Track this across your whole fleet

This code is free to read. AM Fleet Integrity lets your team log fault codes against assets, plus the full fault-code library, QR operator reporting, PM scheduling and predictive alerts. Start free — no credit card required.

Start your free trial

Related Toyota fault codes

← All Toyota fault codes