DCRI300770 — Technical Research
Denso common-rail injector for the GM/Opel 1.6 CDTI 'Whisper Diesel' (engine B16DTH/B16DTN) fitted to the Astra J/K, Zafira Tourer C and Mokka/Mokka X. GM OE 55570012 (cross 95521531 / 821035; Denso 295050-0770). The injector code must be written to the ECU with GM MDI on fitment. Failures are driven by poor fuel filtration, contamination and back-leakage wear. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Water-in-fuel corrosion; Nozzle coking.
Denso DCRI300770 1.6 CDTI (B16DTH/B16DTN) Common Rail Injector (Vauxhall/Opel Astra J/K, Zafira C, Mokka)
Denso common-rail injector for the GM/Opel 1.6 CDTI 'Whisper Diesel' (engine B16DTH/B16DTN) fitted to the Astra J/K, Zafira Tourer C and Mokka/Mokka X. GM OE 55570012 (cross 95521531 / 821035; Denso 295050-0770). The injector code must be written to the ECU with GM MDI on fitment. Failures are driven by poor fuel filtration, contamination and back-leakage wear. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Water-in-fuel corrosion; Nozzle coking.
A leaking injector unbalances cylinder fuelling on the 1.6 CDTI.
Excess back-leakage drops cranking rail pressure.
Out-of-range delivery or rail-pressure deviation cuts power.
Poor atomisation over-fuels the cylinder.
Cylinder-specific injector or fuel-metering codes.
- InstallationWrite the injector code to the correct cylinder with GM MDI before road test.
- InstallationRenew the combustion seal and clamp hardware; torque to spec.
- MisdiagnosisRead live back-leakage data to find the weak cylinder before removal.
- WarningFix contamination (filter/water/debris) first; the 1.6 CDTI is sensitive to fuel quality.
- TestingBench-test on a Denso-capable CR tester across delivery and back-leakage points before refit.
What is Denso injector DCRI300770?+
A Denso common-rail diesel injector for the GM/Opel 1.6 CDTI (B16DTH/B16DTN) engine. GM OE 55570012.
Which vehicles use DCRI300770?+
Vauxhall/Opel Astra J/K, Zafira Tourer C and Mokka/Mokka X with the 1.6 CDTi engine.
Is it solenoid or piezo?+
It is a Denso solenoid common-rail injector.
Does DCRI300770 need coding?+
Yes - write the injector code to the correct cylinder with GM MDI when fitting.
What are the OE part numbers?+
GM/Vauxhall 55570012 (alternate 95521531) references Denso DCRI300770 (Denso 295050-0770).
Which engine codes does it fit?+
The 1.6 CDTI 'Whisper Diesel' B16DTH and B16DTN; confirm the exact code by VIN.
What are the symptoms of failure?+
Rough idle, vibration, hard starting, black smoke, power loss/limp mode and an EML.
Why does my 1.6 CDTI run rough?+
A worn or leaking injector unbalances fuelling; read live back-leakage data and bench-test the weak cylinder.
What causes these injectors to fail?+
Poor fuel filtration, contamination and back-leakage wear - fix the cause first.
Does a remanufactured DCRI300770 perform like new?+
A properly remanufactured injector is bench-tested and recalibrated to the Denso plan, then coded on fitment.