Chrysler Voyager 2.5 CRD Voltage Fluctuating at Tickover: Bosch 0281010814 ECU Tested and Repaired

Nothing in the original complaint about this Chrysler Voyager 2.5 CRD mentioned the engine ECU. The customer reported problems with the vehicle’s electrics, and diagnostics found the voltage fluctuating significantly at tickover, with the engine idling.

The fault was in the ECU all the same: a Bosch EDC15C5, part number 0 281 010 814. Below is how that was established, what the repair involved, and how to check whether your Voyager carries the same unit.

An electrical complaint that ended at the engine ECU

A voltage reading that swings about at idle looks like a charging or wiring problem, and those are the natural places to look first. On this Voyager, the customer sent the ECU to us for independent testing and repair.

Testing the unit on its own, away from the vehicle, gives an answer that belongs to the ECU and not to the wiring or anything else around it. A symptom that shows up in the car’s electrics can still come back to the engine ECU, and that is why the unit is tested before anything is condemned or replaced.

What testing found: one faulty component

We tested the ECU and confirmed the fault, then isolated it to a single faulty component. That gave the problem a precise location on the board rather than a broad verdict that the ECU had failed.

The difference decides what happens next. An ECU written off as a whole points towards a replacement unit, while one identified component can be replaced and the customer’s original ECU kept in service.

We reported what we had found before any chargeable work began, and the customer authorised the repair. The faulty component was then replaced with a new genuine part.

Retested on the rig before it went back

Replacing the part did not finish the job. The ECU went back on our test rig and passed, because a repair is not complete until the unit passes final testing.

The repair carries our 24-month warranty, which covers the specific work carried out.

Checking your Voyager’s ECU against this one

The Bosch number for this unit is 0 281 010 814, and our records pair it with Chrysler part number P04727 664AE. On published units the suffix letters at the end of the Chrysler number vary, with AD and AC also seen, but the digits before them are the same.

The vehicle is the Chrysler Voyager with the 2.5 CRD diesel engine. If the ECU from your Voyager shows the same Bosch number, and a Chrysler number whose digits match ours whatever letters follow, it is the same part as the one repaired here. A matching label tells you the part is the same; it says nothing yet about whether the fault is.

The EDC15C5 covers more part numbers than this one, and the Bosch EDC15C5 range this Voyager’s unit comes from has its own page.

Sending a Voyager 2.5 CRD engine ECU to us

Units reach us by post from anywhere in the UK. Every ECU is tested and repaired in-house by our own engineers, in our own UK workshop. You hear what the testing found, with a quote, and nothing chargeable is done until you say so.

If your Voyager has a fault like this one, tell us what your own diagnostics found on the Repair Form, together with both numbers from the ECU label.

For a different Chrysler engine ECU, see the other Chrysler units we repair. For a vehicle from another manufacturer, begin at our engine ECU repairs page.