One of the most overlooked codes on modern JLR vehicles, and one of the cheapest to fix. What it actually means, the causes ranked cheapest-first, and why ignoring it can lead to an expensive breakdown.
P0562 means the ECU is seeing sustained low system voltage — usually below 11.5 volts while the engine is running. On most Land Rover diesels this is a worn battery, a loose connection, or a failing alternator long before it's a serious electrical fault. It should be diagnosed cheapest-first.
Do not let anyone sell you an alternator before the battery and earth connections have been ruled out. Full diagnostic order below.
In modern common-rail diesels, the ECU continuously monitors system voltage to ensure fuel injectors, glow plugs, and other critical components operate correctly. P0562 is logged when the ECU detects sustained low voltage — typically below 11.5 volts — while the engine is running. Crucially, the code describes a measurement, not a diagnosis. The voltage could be genuinely low (a failing battery or alternator), or it could be the result of a poor earth connection causing an inaccurate reading. That distinction is the entire difference between an £80 fix and a £650 one, and it's why the diagnostic order below matters more than the code itself. This code appears across the full range of JLR vehicles, from the 204DTD Ingenium to the 306DT V6, and the diagnostic approach is essentially identical regardless of which engine triggers it.
Ordered by how often each turns out to be the real culprit — with typical fitted cost against each, so you can sanity-check any quote you've been given.
| Cause | Likelihood | Typical Cost (fitted) | Notes |
|---|---|---|---|
| Ageing or failing 12V battery | Very High | £80–£200 | Check battery age first — cheapest possible outcome |
| Poor earth connection or loose terminal | High | £50–£150 | Often a simple clean and tighten resolves the code |
| Battery sensor (BMS) fault | Medium | £150–£300 | Reports incorrect state of charge to the ECU |
| Alternator output low — worn brushes or regulator | Medium | £350–£500 | Common on higher-mileage 306DT and 204DTD units |
| Alternator complete failure | Low | £450–£650 | Genuine but least common — rule out everything above first |
Cost figures [PATTERN DATA] — indicative independent-specialist pricing, not drawn from our engine replacement dataset.
If it's over 4–5 years old or showing signs of weakness, replace it. A failing battery triggers P0562 more often than anything else.
Clean and tighten the main battery earth strap and the engine-to-chassis earth point. This alone resolves a meaningful share of cases.
Load-test the battery to confirm it can hold voltage under cranking load.
If the battery is healthy, the sensor itself may be the issue.
If steps 1–4 are clear and voltage remains low with the engine running, the alternator becomes the likely answer.
Our diagnostic wizard walks the same order, or confirm your engine first with the registration lookup.
Conditionally, yes — short journeys to get it diagnosed. P0562 on its own is not an engine-destroying fault the way an oil pressure warning is. But if the voltage drops below 10.5 volts while driving, the ECU may shut down non-essential systems, and eventually the engine could stall. Prolonged running with low voltage can also shorten the life of the battery and alternator — turning a cheap fix into an expensive one. Get it looked at within days, not weeks.
For short journeys to reach a garage, generally yes — but not for normal use, and not on motorways if the vehicle has entered limp mode. Prolonged running with low voltage can shorten battery and alternator life, and in severe cases the engine may stall.
No. Across the five ranked causes, alternator failure is the least common. An ageing battery or a poor earth connection are both far more likely and cost a fraction as much.
Only temporarily. The code will return once the ECU sees the voltage discrepancy again, usually within a drive cycle or two. Clearing it also destroys the freeze-frame data a specialist would have used to narrow the cause.
Expect one to two hours of diagnostic time at an independent JLR specialist. Many will offset that cost against the repair if you proceed with them.
Cheapest-First AlwaysWe rank causes by likelihood and cost, not by what's profitable to quote.
Honest About CostWhere a fault is usually cheap to fix, we say so plainly.
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