Haval Jolion Trouble Codes: Full Guide to Errors and Fixes
2025
🔍 Haval Jolion Trouble Codes: Full Guide to Faults and Fixes
Haval Jolion, one of Great Wall Motors' most popular crossovers, offers impressive value and features. Still, like any modern vehicle, it can occasionally display trouble codes—either on the dashboard or read via an OBD2 scanner. These codes help pinpoint faults and guide the repair process.
📌 What Is an OBD2 Error Code?
On-Board Diagnostics II (OBD2) is a standardized system used in vehicles since 1996 to detect malfunctions in engines, transmissions, and other critical systems. The codes start with a letter indicating the system:
* P – Powertrain (engine/transmission)
* B – Body (comfort/electrical)
* C – Chassis (braking/suspension)
* U – Network (communication between modules)
Here are the most frequently reported error codes among Haval Jolion owners, along with their descriptions, likely causes, and recommended actions:
* P0100 – This code indicates a malfunction in the Mass Air Flow (MAF) sensor circuit. It is often caused by a dirty or damaged MAF sensor. To resolve the issue, clean the sensor or replace it if necessary.
* P0171 – This code means the engine is running too lean on Bank 1. Common causes include vacuum leaks or clogged fuel injectors. The recommended action is to inspect the intake system and clean or service the fuel injectors.
* P0300 – A random or multiple cylinder misfire has been detected. This can result from faulty spark plugs, ignition coils, or a failing fuel pump. A full check of the ignition system and fuel pressure is advised.
* P0420 – Indicates that the efficiency of the catalytic converter is below the required threshold. It may be due to a clogged or deteriorated catalytic converter. You should inspect the exhaust system and replace the converter if necessary.
* P0700 – A general transmission control system malfunction. This could point to problems within the automatic transmission or its control module. A complete transmission diagnostic is recommended.
* U0100 – This code signals a lost communication with the Engine Control Module (ECM). It is typically caused by issues with the CAN bus wiring or a failed ECM. Check the wiring harness and related modules for faults.
* B1402 – Indicates a fault in the airbag (SRS) system. The issue might lie in a faulty sensor or a loose/broken connector. SRS diagnostics are needed to identify and fix the exact fault.
* C1234 – This code points to an ABS sensor malfunction, often due to damaged sensor wiring or the sensor itself. Replacing the faulty ABS sensor usually resolves the issue.
⚠️ Haval Jolion-Specific Issues
1. Electric Power Steering (EPS) Warning
Some owners report EPS failure warnings, especially after long drives or during cold starts. Temporary solutions include restarting the engine, but deeper issues may involve:
* EPS control unit malfunction
* Low or unstable battery voltage
* Outdated software
🔧 Fix: Update firmware at a dealership and test the battery's health.
2. Check Engine Light in High Altitude/Pressure Regions
Drivers in regions with higher atmospheric pressure have noticed Check Engine lights caused by MAP (manifold absolute pressure) sensor errors, particularly in AWD versions.
🔧 Fix: Reprogram the ECU and check intake system for leaks.
#3. Airbag System Malfunctions
Airbag (SRS) warning lights often correspond to codes B1401 or B1402. Likely causes include:
* Loose connectors under the seats
* Faulty impact sensor
* Malfunctioning SRS control unit
🔧 Fix: Clean connectors, inspect wiring, and reset the code via scanner.
🧰 How to Read and Clear Error Codes
Method 1: OBD2 Scanner
1. Connect the scanner to the OBD2 port (usually below the steering column).
2. Turn the ignition to "ON" (engine off).
3. Read codes and note descriptions.
4. After resolving the issue, clear the code.
📱 Tip: Popular Bluetooth scanners like ELM327 work with apps like Torque, Car Scanner, or OBD Auto Doctor.
Method 2: Dealer Diagnostics
Official Haval service centers use proprietary tools that can detect both standard and manufacturer-specific codes.
💡 How to Prevent Error Codes
* Follow scheduled maintenance. Use approved oil, filters, and fluids.
* Maintain battery health. Low voltage often leads to sensor malfunctions.
* Avoid unauthorized aftermarket parts. Especially electronic systems.
* Keep firmware updated. Ask dealers to install ECU and TCU updates.
* Don’t overload the vehicle. Excessive stress may trigger faults.
📚 Useful Resources
1. Haval Jolion Owner’s Manual (PDF):
[haval.ru → Jolion Manual](https://haval.ru/JOLION_16423845261441749620.pdf)
2. Owner Forums:
[haval-clubs.ru](https://haval-clubs.ru), [Drive2.ru](https://www.drive2.ru)
3. Global OBD2 Code Databases:
[obd-codes.com](https://www.obd-codes.com), [dtcsearch.com](https://www.dtcsearch.com)
🔚 Final Thoughts
Trouble codes are not something to fear—they’re diagnostic tools to help maintain your vehicle and avoid serious failures. With a basic scanner and some awareness, Haval Jolion owners can often identify and resolve issues independently or know when it’s time to visit a professional.
💡 Pro tip: Keep a log of past codes and service actions. This can be helpful when selling the vehicle or discussing warranty claims.
9. MG ZS EV vs. Competitors: How It Compares
When compared to other electric SUVs in the same price category, the MG ZS EV shows both strengths and limitations.
MG ZS EV offers a real-world range of 200 to 240 km, which is acceptable for city and short intercity use. However, the infotainment system is basic and sometimes buggy, and the build quality is average, with some owners reporting dashboard rattles and loose panels. It also lacks over-the-air (OTA) software updates, requiring dealer visits for upgrades. Its main advantage remains the affordable price, making it an attractive choice for first-time EV buyers.
BYD Atto 3, on the other hand, provides a longer range of 250 to 300 km and a smoother, more modern infotainment system. It has above-average build quality and supports OTA updates. However, it comes at a noticeably higher price point than the MG ZS EV.
Hyundai Kona Electric stands out with a real-world range of 280 to 320 km, excellent build quality, and a polished user experience. It also supports OTA updates, but it is the most expensive among the three options.
Overall, the MG ZS EV is best suited for budget-conscious drivers willing to compromise slightly on tech and quality in exchange for affordability and solid daily usability.
Summary:
*The ZS EV is a value-driven choice, but if infotainment or finish matters more, consider spending extra on rivals like the BYD Atto 3 or Kona Electric.
10. Warranty and Servicing Experience
MG offers a 7-year/80,000-mile warranty on the ZS EV in most markets, which is among the best in its class.
What it covers:
* Full EV battery warranty (with degradation clause).
* Drivetrain, electronics, and basic interior components.
* Free roadside assistance in the first 12 months.
Servicing concerns:
* Not all MG dealerships are equally experienced with EVs.
* Wait times for service appointments can be long in rural areas.
Tip:
* Choose an MG service center certified for EV-specific repairs.
* Schedule updates and maintenance in advance to avoid delays.
Conclusion: Is the MG ZS EV Still Worth It?
Despite its issues, the MG ZS EV remains a strong contender in the budget electric SUV category. It offers excellent value, a decent driving experience, and low running costs. Most of the problems are either minor or can be resolved through software updates and routine maintenance.
Final Verdict:
If you’re looking for a practical and affordable entry into the world of EVs, and can live with a few quirks, the MG ZS EV is still a solid choice — especially the facelifted Long Range model released from 2022 onward.
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