Mazda CX-5 Alternator: Specs, Fitment & Common Faults
On the CX-5, a "Charging System Malfunction" message is often genuinely a software glitch, not a true hardware failure.
Illustration for editorial purposes
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OEM Part Number: PE01-18-300 (genuine alternator — confirm via VIN) — aftermarket alternators Bosch 1 986 A00 631 / Hella 8EL 011 713-811
| Alternators (aftermarket) | Hella 8EL 011 713-811 (150 A, freewheel pulley, 6 ribs, 51 mm, new); Bosch 1 986 A00 631 (100 A, rigid multi-rib pulley, 6 ribs, 51 mm, new, plug 139, excludes vacuum pump); AS-PL A5145 (150 A, freewheel pulley, 6 ribs, 51 mm, new, plug PL_3310); AS-PL A5337 (100 A, 6 ribs, 51 mm, new, plug PL_3310); AS-PL A5616S (100 A, 6 ribs, 51 mm, new, plug PL_3310); Ridex 4G1370 (150 A, freewheel pulley, 6 ribs, 51 mm, new, integrated regulator, excludes vacuum pump); Walker WAL01196 (150 A, 6 ribs, 51 mm, remanufactured, plug 0314, core charge £50.24). |
|---|---|
| Outputs & variants | 100 A six-rib 51 mm units with a two-pin P/D plug for the standard 2.0 Skyactiv-G petrol. |
| Genuine (OE) numbers quoted | A5TL0491 (AS-PL A5337); A5TJA091 (AS-PL A5616S); A2TX3081 (AS-PL A5145 and Meat & Doria 55351001). |
| Fitment notes | Mitsubishi Electric supplied the original units, so quote the A2TX or A5TL number from the old alternator when ordering; the diesel's 150 A unit has a freewheel pulley that must be replaced like for like, and BV PSH "Selected Reman" and "Pro Reman" units are remanufactured despite being listed as new. |
A Genuinely Important Warning Worth Knowing Before Replacing the Alternator — Mazda CX-5 Alternator
If you're seeing a "Charging System Malfunction" or "Low Battery Risk" warning message, particularly on a relatively new car, this is genuinely worth knowing: this specific warning has been widely reported as often being a software sensitivity issue related to the Body Control Module, rather than a genuine hardware failure. It's worth asking a dealer directly whether a relevant software fix exists before assuming the alternator needs replacing.
It's also worth knowing that alternator fitment is genuinely more complex than it might first appear — the correct part depends on engine size, the specific transmission fitted, and whether the engine has cylinder deactivation.
Mazda CX-5 Alternator: Often Blamed on the Battery Instead
Because a weak Mazda CX-5 battery and a dying alternator both cause dim lights, slow starts and charge that won't hold, it's an easy mistake to replace the wrong one first. That mix-up sends plenty of people back to the garage a few weeks later, the real fault still there.
Mazda CX-5 Alternator: Watch: Replacing It
2.5 petrol
Mazda CX-5 Alternator: What It Does
Every time the Mazda CX-5's engine runs, the alternator is generating the electricity that charges the battery and directly feeds the electrical systems. A properly working alternator leaves the battery mostly responsible for engine starts and short demand spikes — not for running the electronics unaided.
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Mazda CX-5 Alternator: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Alternator Guide for symptoms to watch for (plus a genuinely useful two-minute test to confirm it's not the battery instead), confirming the right amperage and fitment against your VIN, and which brands are worth trusting.
More Mazda Alternator
The same part, covered across other Mazda models.