P0E4E: Engine Failed to Crank
Do not keep driving
The engine will not start, though the car may still move on electric power. Do not let anybody fit a starter motor before the hybrid system has been read — most hybrids start the engine with the traction motor and have no starter at all. Getting the twelve-volt battery tested is a sensible first step; after that this is a high-voltage diagnosis.
What this code means
The engine was commanded to start and did not turn.
On a hybrid this code means something almost opposite to what it says, and the misunderstanding is expensive.
Most hybrids have no starter motor. The engine is spun up by one of the traction machines — the motor-generator — through the transaxle, at several hundred volts. There is no solenoid, no pinion, no ring gear engagement, and frequently no twelve-volt starter circuit at all. Some vehicles keep a conventional starter as a cold-weather backup; many do not.
So "failed to crank" on this car is a high-voltage fault, not a starting-system fault. The chain is: the traction battery must have charge and be able to deliver current, the contactors must close, the inverter must work, and the generator must produce torque. A break anywhere along it produces this code, and none of those parts is a starter.
The failure mode to name plainly is a starter motor being fitted to a car that never had one, or a twelve-volt battery being replaced because the symptom sounds familiar. The twelve-volt battery is genuinely worth checking first — not because it cranks the engine, but because the modules that command the start need it, and a weak one stops the sequence before it begins. That is the cheap check; after it, the diagnosis moves to the high-voltage side.
Read what else is stored before anything else. This code is usually a consequence, and the code beside it is usually the cause.
Likely causes
Start here
- Weak or failed cell group in the battery pack · specialist
- Faulty power inverter · specialist
Less common
- Deeply discharged after long-term parking · moderate
- Faulty battery contactor · specialist
- Failed control module · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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