P0352 fault code: Ignition Coil 'B' Primary/Secondary Circuit
Last updated · OBDCode UK editorial
This code alone does not normally mean you must stop driving. Still treat a persistent engine management light seriously and have the fault confirmed before your MOT. If you see damaged orange high-voltage cables, stay clear and arrange recovery — do not probe the high-voltage system.
Can I DIY?
Caution — conditions apply. A related check or task may allow limited DIY with the stated tools and site conditions — only after you read the safety warnings on this page. We still do not publish full strip-down fitting steps here.
Some checks may be possible for a careful DIY driver with the right tools and a safe place to work. Stop if anything feels beyond your skill or kit.
On a 12V battery: disconnect negative first, reconnect negative last. Prevent sparks and short circuits. Stop if the battery is damaged or sits near orange high-voltage cables.
What does P0352 mean?
P0352 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P03xx block, which covers ignition system and misfire. The stored description is “Ignition Coil 'B' Primary/Secondary Circuit”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.
Will P0352 fail an MOT?
An illuminated engine management light is a Major defect at MOT since 2018 — an automatic fail until the fault is repaired and the light stays off. Clearing the code without fixing the cause is not a repair.
Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.
What the MOT data says
No MOT certificate item corresponds to this code; MOT outcome data cannot be shown.
Related guides
Related fault codes
P0352 — quick answers
Is it safe to drive with P0352?
Drive with care. This code alone does not normally mean you must stop driving. Still treat a persistent engine management light seriously and have the fault confirmed before your MOT. If you see damaged orange high-voltage cables, stay clear and arrange recovery — do not probe the high-voltage system.
Can I fix P0352 myself?
Caution — conditions apply. A related check or task may allow limited DIY with the stated tools and site conditions — only after you read the safety warnings on this page. We still do not publish full strip-down fitting steps here. Basic tools only — for example a household socket set, tyre gauge, or a consumer OBD reader.
Will P0352 fail my MOT?
An illuminated engine management light is a Major defect at MOT since 2018 — an automatic fail until the fault is repaired and the light stays off. Clearing the code without fixing the cause is not a repair.
Fault-code identifiers are standard diagnostic facts. Their explanations and diagnostic guidance on this site are original editorial summaries, not reproduced SAE wording. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.