P3191 Code - Engine Does Not Start
Quick Answer
The Hybrid Vehicle Electronic Control Unit (HV ECU) delivers data to the Engine Control Module (ECM) for such items as power output required for the engine (required output), estimated torque produced by the engine, engine RPM of control target RPM, and whether the engine is in start mode or not. Common causes include Air induction system malfunction, Defective throttle body, Improper fuel pressure. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P3191 indicates Engine Does Not Start.
- Common causes
- Common causes include Air induction system malfunction, Defective throttle body, Improper fuel pressure.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P3191 Description
-Communication with HV ECU is normal.
-Engine RPM is a fixed value or more.
-Engine start mode is not active.
What are the Possible Causes of the DTC P3191?
- Air induction system malfunction.
- Defective throttle body.
- Improper fuel pressure.
- Defective engine.
- Defective Mass Airflow (MAF) meter.
- Vehicle is out of fuel.
- Defective Engine Coolant Temperature (ECT) sensor.
- Defective crankshaft position sensor.
- Defective camshaft position sensor.
- Defective Engine Control Module (ECM).
How to Fix the DTC P3191?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P3191 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P3191 code?
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Need Help with the Code?
Get the P3191 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P3191 Lexus — Engine Does Not Start
- P3191 Toyota — Engine Does Not Start
Frequently Asked Questions about P3191 Code
1. What are the common symptoms of OBDII code P3191 (Engine Does Not Start)?
- Common symptoms include the engine cranking but not starting, lack of power, and rough idling.
2. What are the possible causes of OBDII code P3191?
- Possible causes of P3191 include issues with the fuel system, ignition system, sensors, or the engine control module.
3. How can I diagnose the cause of OBDII code P3191?
- Diagnosing P3191 involves checking fuel pressure, inspecting spark plugs and ignition coils, testing sensors, and scanning the engine control module for related error codes.
4. Can a faulty fuel pump trigger OBDII code P3191?
- Yes, a faulty fuel pump can cause insufficient fuel delivery, leading to code P3191 and engine starting issues.
5. What role do sensors play in triggering OBDII code P3191?
- Sensors such as the crankshaft position sensor or camshaft position sensor play a crucial role in the engine starting process and can trigger P3191 if they malfunction.
6. Are there any quick repair tips for addressing OBDII code P3191?
- Quick repair tips include checking for loose or damaged wiring, ensuring proper fuel quality, and performing a thorough inspection of the ignition system components.
7. Is it safe to continue driving with OBDII code P3191 present?
- It is not recommended to drive with code P3191 active, as it can lead to further engine damage and potential safety hazards.
8. Can a low battery voltage cause OBDII code P3191 to appear?
- Yes, low battery voltage can affect the performance of various engine components and potentially trigger code P3191.
9. Should I reset the OBDII code P3191 after making repairs?
- Yes, it is advisable to reset the code after making repairs to see if the issue has been successfully resolved.
10. How much does it typically cost to repair OBDII code P3191?
- The cost of repairing P3191 can vary depending on the underlying cause, but it may range from a simple sensor replacement to more extensive repairs involving the fuel system or engine components.
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