ECU 9666909780 V29006828A – description
This is a used Valeo V34.1 engine control unit for Peugeot and Citroën with a petrol engine. We test every unit before dispatch.
Failure symptoms – what to look for
- the car will not start, the injectors are not controlled,
- the diagnostic tester cannot connect to the ECU,
- the fuses are fine, but the ECU has no power,
- the problem appeared after water ingress or a wiring short circuit.
The cause can also be wiring, power supply or sensors. Before you buy an ECU, have the car diagnosed.
Label details
- PSA number: 9666909780
- Valeo number: V29006828A
- ECU type: Valeo V34.1
Compare them with the label on your own ECU.
Fitting without programming
ECU 9666909780 has its immobiliser disabled (IMMO OFF). Once connected in the car, it does not need programming or pairing with the immobiliser. Want to transfer the data from your old ECU? Send it to us – cloning is free. The warranty is 6 months.
Matching by part number
- Application: selected versions of Peugeot and Citroën with a petrol engine.
- Numbers to compare: 9666909780, V29006828A.
- Model and year do not decide compatibility – the label does.
- Not sure? Send us a photo of your ECU label.
Looking for a number other than 9666909780? Browse the Peugeot and Citroën categories or the Valeo manufacturer page.
Frequently asked questions about ECU 9666909780
Is 9666909780 a new ECU?
No. We sell a used unit that is tested before dispatch.
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Does ECU 9666909780 need programming?
No. It is an IMMO OFF plug & play version: the immobiliser is disabled, so no programming is needed after fitting.
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Does no communication always mean a faulty ECU?
Not always. The cause can be in the wiring, power supply or sensors – that is why a diagnosis before buying is worth doing.
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Does ECU 9666909780 fit my car?
Compare the label of your ECU with the numbers 9666909780, V29006828A. If they match, the ECU fits – the car model alone does not decide this.
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