Chevrolet and GM Common OBD-II Codes: Cruze 1.4T, Lacetti 1.6, Captiva 2.0 CDTi

Chevrolet Cruze, Lacetti, Aveo, and Captiva are widespread GM group vehicles (Opel/Vauxhall platforms). Most engines and transmissions are identical to Opel: A14NET (Astra), Z16XE (Astra/Vectra), Z20DMH (Antara/Captiva). As a result, fault codes are the same.

1.4 Turbo A14NET (Cruze J300, Opel Astra J): Turbocharged Petrol

P2187 — Lean Mixture at Idle

A14NET is closely related to VW EA111. First sign of valve carbon:

Cause: PCV system in cam cover eventually lets more oil into the intake → carbon on valves (GDI-type effect, even though A14NET uses port injection).

Live Data:

• STFT B1 > +8% at idle → vacuum leak or carbon
• LTFT B1 > +6% persistently → carbon deposits or intake system issue

P0299 — A14NET Underboost (Cruze)

Very common Cruze problem with A14NET:

• Cracked or disconnected intercooler hose (from thermal fatigue)
• Faulty N75 turbo control valve (plastic body)

Live Data:

• MAP Boost Pressure Target vs Actual at 2,500 RPM: difference > 25 kPa → leak
• Wastegate Duty Cycle: 0% at full throttle → N75 valve failed

P0300 — Misfires from Carbon

Cruze with A14NET after 80,000 km without valve cleaning:

• Misfire Count Cylinder 1–4: all elevated at idle
• Decrease after warm-up → carbon (not spark plugs)

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1.6 Z16XE / Z16XER (Lacetti, Aveo T250): Naturally Aspirated 16V

P0011 — Cam Phaser: Over-Advanced

Z16XER (newer version) has VVT on intake:

• P0011 from worn cam phaser or poor oil quality
• Camshaft Position Actual vs Target: deviation > 5° → phaser or oil pressure

P0340 — CMP Sensor Signal: Chain Issue

Z16XE after 100,000 km without oil changes:

• Timing chain stretches → CMP signal becomes unstable
• P0340 + metallic rattle on cold start → chain replacement needed

Live Data:

• Camshaft Position Timing over-advanced or System Performance
• Oil Pressure on cold engine: < 2.5 bar → oil pump or chain not holding on low pressure

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2.0 CDTi Z20DMH / Z20DMJ (Captiva, Antara): Diesel

Shared diesel for Chevrolet Captiva and Opel Antara — Opel 2.0 CDTI variant:

P0087 — Rail Pressure

Z20DMH after 120,000 km:

• Bosch CP3 pump — reliable but wear after extended operation
• Rail Pressure Actual at idle: normal 250–320 bar; lower → pump or injectors

P0401 — EGR: Insufficient Flow

• Carbon in EGR valve after 60,000–80,000 km urban driving
• EGR Valve Position vs Requested: difference > 10% → valve stuck

P2002 — DPF Efficiency

Captiva diesel in urban use:

• DPF Soot Loading %: > 80% → regeneration not completing due to short trips
• Recommendation: once a fortnight — drive 30+ km at steady 80 km/h+

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2.0/2.4 LE5/LE9 (Captiva Petrol): American Ecotec Engines

Petrol Captiva versions with GM Ecotec:

P0017 — Cam Phase Correlation

LE5/LE9 with VVT have a characteristic tensioner issue:

• Rattle on cold start → timing chain
• P0017 or P0014 → cam phaser or tensioner

P0420 — Catalyst Efficiency Below Threshold

• Front catalyst on Captiva prone to heat ageing
• O2 Sensor B1S2 Voltage oscillates like B1S1 → catalyst worn
• Check: after 30 min motorway driving → B1S2 should be stable at 0.65–0.75V

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Aisin AF40-6 Automatic (Cruze, Captiva)

Aisin AF40-6 — 6-speed automatic on Cruze and Captiva:

• P0741 — TCC slip
• P0730 — Gear ratio incorrect

Live Data:

• ATF Temperature: normal < 90°C; > 110°C → ATF cooling ineffective
• TCC Slip RPM: > 80 RPM → TCC worn or ATF degraded

Aisin servicing: ATF change every 60,000 km (not “lifetime” — that’s marketing).

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GM-Specific OBD-II Notes

GM and Chevrolet have some OBD-II specifics:

• Vehicle Power Mode replaces the standard key identifier
• GM Enhanced codes (P1xxx, P2xxx GM-specific)

Extended GM PIDs via Mode 22:

• Engine Oil Life Remaining % — GM Minder (oil life monitoring system)
• Transmission Fluid Temperature — separate from standard ATF PID
• Battery Voltage ECM — voltage from ECU perspective, not general

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Summary: Chevrolet / GM

Model	Engine	Top Codes
Cruze J300	A14NET 1.4T	P0299 turbo, P2187
Lacetti / Aveo	Z16XE/XER	P0340 chain, P0011 VVT
Captiva diesel	Z20DMH	P0087, P0401 EGR
Captiva petrol	LE5 2.4	P0017 timing, P0420
Cruze/Captiva	Aisin AF40-6	P0741 TCC, ATF

GM vehicles diagnose well through standard OBD-II — but Engine Oil Life and some transmission parameters require Mode 22.

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