Hyundai Solaris 2 won't start: 12 reasons and step-by-step repairs

• If it falls below 9 V — the battery does not support the load.

Solutions:

• 🔌 Recharge the battery charger (current 2–3 A, time - 8–12 hours).
• 🚗 Light a cigarette from another car (observe polarity!). On Solaris 2 The “positive” terminal is covered with a plastic cover - remove it before connecting.
• 🔧 Check electrolyte level (if the battery is serviceable). Norm - 10–15 mm above the plates. Add only distilled water.
• 🔄 Replace the battery, if its age is more than 5 years or there are mechanical damages.

⚠️ Attention: On Hyundai Solaris 2 with the system Smart Key (keyless entry) a low battery may block the immobilizer. After recharging the battery, you may need to relearn the key through the diagnostic scanner.

3. Starter malfunctions: why it doesn’t turn or clicks

If you hear clicks when you turn the key, but the starter does not rotate the engine, the problem is in the engine itself or in its power supply circuit. On Solaris 2 starters were installed Mando or Denso, which are reliable, but wear out over time.

Typical starter faults:

• 🔧 Wear of brushes or commutator: The starter turns slowly or jerkily.
• 🧲 Solenoid relay failure: Clicking is heard, but there is no rotation.
• 🔗 Bendix problems: the starter spins “idling” without engaging the flywheel.
• 🔌 Open circuit or short circuit in the winding: the starter does not respond to the signal.

How to check the starter without removing it:

1. Turn the key to position ON (ignition is on, but starter does not work).
2. Remove the chip from the crankshaft position sensor (located next to the flywheel).
3. If the starter starts turning, the problem is in the sensor or its wiring.
4. If there is no reaction, check the power supply contact 50 solenoid relay (must be +12 V when turning the key).

For accurate diagnostics, the starter will have to be removed. On Solaris 2 it takes about 1 hour:

1. Disconnect the negative terminal of the battery.
2. Remove the air filter and pipe.
3. Unscrew the 3 starter mounting bolts (two on top, one on bottom).
4. Disconnect the power cable and control wire.

⚠️ Attention: When disassembling the starter, do not lose retaining ring on the armature shaft - without it the bendix will not work correctly. On Solaris 2 This ring often falls out during careless dismantling.

4. Problems with the fuel system: why the engine does not catch

If the starter turns properly, but the engine Solaris 2 If it won't start, check the fuel system. These motors most often fail:

• 🔥 Fuel pump: does not pump gasoline or works intermittently.
• 🔧 Fine filter: clogged and does not allow fuel to pass through.
• 📉 Fuel pressure sensor: gives incorrect readings.
• 🔌 Fuel pump relay: does not work when the ignition is turned on.

How to diagnose:

1. When you turn on the ignition, you should hear the sound of the fuel pump (buzzing in the rear seat area). If not, check the fuse F21 (15A) and relay K12 in the mounting block.
2. Check the fuel rail pressure:
   • Norm for 1.4/1.6 MPI — 3.5–4.0 bar.
   • If the pressure is lower 2.5 bar — the filter is clogged or the pump is faulty.

• Norm for Solaris 2 — 0.5–1.0 Ohm (primary winding).
• Swap coils from different cylinders. If the misfires “move” to another cylinder, the coil is faulty.

Common ECU errors:

• P0301–P0304 — misfires in cylinders 1–4.
• P0351–P0354 - ignition coil malfunction.

6. Problems with the immobilizer and electronics

If Solaris 2 does not start, but the starter turns, and the immobilizer indicator (key icon) flashes on the panel - there is a problem in the security system. The system was installed on these machines Hyundai Immobilizer, which may block startup due to:

• 🔑 Faulty chip in the key.
• 📡 Damaged immobilizer antenna (located around the ignition switch).
• 🔧 Failure in the immo control unit (often after disconnecting the battery).

How to diagnose:

1. Try starting the car with the second key. If it starts, the problem is in the first key chip.
2. Check if the immobilizer indicator is on:
   • 🔴 Constantly on - immo does not recognize the key.
   • 🟡 Flashing - system failure, retraining required.

• B2411 — immobilizer antenna malfunction.
• B2412 - key chip error.

How to retrain a key:

1. Insert the key into the ignition.
2. Rotate to position ON (do not start the engine).
3. Wait 10 minutes until the immo indicator goes off.
4. Turn off the ignition and repeat the procedure 2 more times.
5. After the third cycle, the key will be retrained.

⚠️ Attention: If, after replacing the battery or removing the terminals, the immobilizer blocks the start, do not try to start the car “directly” (by closing the starter). This may cause the ECU to lock up. Use only the standard key retraining procedure.

7. Other possible causes: from sensors to mechanics

If all previous checks have failed, the problem may lie in less obvious faults. Let's look at rare but possible reasons:

Sensors:

• 📊 Crankshaft position sensor (CPS): if it is faulty, the ECU does not “see” the position of the shaft, and fuel is not supplied. Error: P0335.
• 🌡️ Coolant temperature sensor (DTOZH): When it breaks down, the ECU incorrectly adjusts the mixture composition. Error: P0115.
• 💨 Mass air flow sensor (MAF): contamination or failure leads to incorrect calculation of the fuel mixture. Error: P0100.

Mechanical problems:

• 🔗 Broken timing belt: if the belt breaks, the valves will bend (on 1.4/1.6 MPI These are engines with “back-to-back” pistons).
• 🛢️ Jammed generator or pump: may block crankshaft rotation.
• 🔧 Problems with timing marks: If the belt has moved 1-2 teeth, the engine will not start.

Other faults:

• 🔌 Poor ground contact: on Solaris 2 the main “mass” is attached to the body under the battery. Oxidation of the contact leads to malfunctions of the ECU.
• 📶 ECU firmware failure: rare, but happens after unsuccessful chip tuning or a power outage during an update.

FAQ: Frequently asked questions about the launch of Hyundai Solaris 2