Description
OEX DXA4038 12V 140A Denso Style Alternator Twin Leg External Regulator PCM Controlled ER55 New Unit
The OEX DXA4038 is a new 12V 140A Denso-style alternator with a twin leg mount and external regulator. This alternator is regulated by the vehicle's PCM (Powertrain Control Module) - not an internal voltage regulator. Before replacing, inspect the wiring and confirm the PCM is functioning correctly, as an externally regulated alternator that appears faulty may have a PCM or wiring fault rather than an alternator fault. Confirm fitment by OE number. 3-year passenger vehicle warranty, 1-year commercial warranty.
Product overview
The DXA4038 is an externally regulated alternator, meaning voltage regulation is handled by the vehicle's PCM rather than an internal voltage regulator. This is a critical distinction from internally regulated alternators. Before replacing this unit, inspect the alternator wiring harness and confirm the PCM is functioning correctly - a faulty PCM or wiring fault can prevent an externally regulated alternator from charging correctly and may be misdiagnosed as an alternator failure. Replacing the alternator without diagnosing the root cause will not resolve a PCM or wiring fault.
The supplier recommends confirming fitment by OE number for this SKU. Match all mounting dimensions, pin code and pulley configuration against your vehicle's existing alternator before ordering.
Features and benefits
New unit: Brand new - not remanufactured.
140A output: High-output alternator for vehicles with elevated electrical demands.
External regulator - PCM controlled: Voltage regulation is handled by the vehicle's PCM. Inspect wiring and confirm PCM function before replacing. Do not replace this unit without first ruling out a PCM or wiring fault.
Twin leg mount, 130mm CTC, 60mm inside leg: Confirm all mounting dimensions against the vehicle before ordering.
6-groove 53mm OD pulley: 6-groove multi-rib pulley for serpentine belt drive systems.
M10x1.5/11mm pivot hole, 11mm adjusting hole: Confirm hole sizes and thread specifications suit the vehicle's mounting points.
ER55 pin code: Confirm pin code and all dimensions against your vehicle.
Confirm by OE number: Supplier recommendation for this SKU - confirm against your vehicle's OE alternator number before ordering.
3-year passenger / 1-year commercial warranty: Extended warranty for passenger vehicle applications.
Technical specs
| Specification |
Detail |
| SKU |
DXA4038 |
| Brand |
OEX |
| Voltage |
12V |
| Output |
140A |
| Style |
Denso |
| Regulator |
External (PCM controlled) |
| Mount |
Twin leg |
| Pulley Section |
6-groove |
| Pulley OD |
53mm |
| Mount CTC |
130mm |
| Inside Leg |
60mm |
| Pivot Hole |
M10x1.5/11mm |
| Adjusting Hole |
11mm |
| Pin Code |
ER55 |
| Condition |
New |
| Weight |
5.54kg |
| Warranty |
3 years (passenger), 1 year (commercial) |
Frequently asked questions
Is this a new or remanufactured unit? New. The DXA4038 is a brand new unit, not remanufactured or rebuilt.
What does "externally regulated" mean? An externally regulated alternator does not have its own internal voltage regulator. Instead, voltage regulation is controlled by the vehicle's PCM. This means the PCM sends a signal to the alternator to control its output. If the wiring harness or PCM is faulty, the alternator will not charge correctly even if the alternator itself is in good condition.
Why should I inspect the wiring and PCM before replacing? An externally regulated alternator that appears to not be charging may have a PCM or wiring fault rather than an alternator fault. Replacing the alternator without diagnosing the root cause will not fix a PCM or wiring problem. Inspect the wiring harness and confirm PCM function before ordering a replacement.
What is the warranty on this alternator? 3 years for passenger vehicle applications, 1 year for commercial use.
What should I confirm before ordering this alternator? Confirm by OE number as recommended by the supplier. Also confirm mount type (twin leg), CTC (130mm), inside leg (60mm), pivot hole (M10x1.5/11mm), adjusting hole (11mm), pulley section (6-groove), pulley OD (53mm) and pin code (ER55) all match your vehicle's requirements before ordering.
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