GWM Fault Codes, Explained in GWM Context
Written and edited by Ethan Cole, Editor-in-Chief · ✓ Technically reviewed by Daniel Wei Chen — Senior Chinese Automotive Diagnostics & Repair Specialist, Sydney · 22 August 2026.
A cheap OBD-II reader tells you what the ECU saw — not why. This section connects standard code definitions (SAE J2012 / ISO 15031-6) to the documented GWM-specific patterns from our research: the Cannon diesel’s DPF life, the hybrid family’s communication recall, and where the DIY line sits. We only publish what we can verify; manufacturer-specific P1xxx codes without public GWM documentation aren’t here — we say so rather than guess.
Codes documented so far
| Code | Standard meaning | GWM context |
|---|---|---|
| P2002 | DPF efficiency below threshold | The Cannon diesel’s signature code — usually a driving-pattern story, not a parts story |
| P2463 | DPF soot accumulation | P2002’s escalation — the code that decides between a highway run and a workshop visit |
| P0562 | System voltage low | The 12V housekeeping code on Jolion/H6 hybrids and the Ora |
| U0100 | Lost communication with ECM/PCM | The recall trap: on 2025 Tank 500/Cannon Alpha/Tank 300 hybrids, comm faults can be the recalled shielding defect — check the VIN before diagnosing |
How to read a code without fooling yourself
- The code is a symptom, not a diagnosis. P2002 means the filter isn’t catching what it should — it doesn’t mean “replace the DPF”.
- Freeze-frame matters: note when it set — short-trip week? towing? after a jump-start?
- Clearing a code erases the evidence a workshop needs. Photograph first.
- On hybrids: recall status first, diagnosis second — REC-006516’s symptoms mimic scattered electrical faults.
Code definitions per SAE J2012; GWM context from our per-model problems research and the official Australian recall register. Codes without verifiable GWM-specific documentation are not published.
Disclaimer: Information on this page is general guidance only and does not replace the manufacturer’s official documentation or the judgement of a qualified technician. Never open, touch or work on any orange high-voltage component. Fault-code behaviour varies between markets, model years and software versions. Last verified: 22 August 2026.