Peugeot 3008 and 5008: larger PSA cars and their diagnostics

The 3008 and 5008 use the same engine range as the 208 and 2008, in a larger and heavier body with substantially more electronics.

Shared reference: Peugeot 308 dashboard warning lights, Peugeot and Citroën common DTC codes and Peugeot 208 and 2008.

The PureTech wet belt applies here too

The 1.2 PureTech uses a timing belt running in engine oil, and the failure mode is the same: the belt sheds material, that material blocks the oil pickup, and oil pressure is lost.

Establish the belt service history. It is the single most consequential question about a used PureTech, and it applies regardless of body style.

Timing belt replacement OBD indicators and oil light flickering at idle.

A larger heavier body works the engine harder, which does not help.

BlueHDi diesel

The volume choice in these models, and generally well suited to them — provided the journeys match.

• The fuel additive in its own reservoir, which needs periodic refilling and which owners rarely know about.
• DPF — track soot load and distance between regenerations: DPF light on and P2459 regeneration frequency.
• AdBlue — the countdown is legislated: AdBlue warning countdown and P204F reductant system performance.
• EGR carbon: P0400 and P0403 EGR flow.
• Injectors: common rail injector diagnostics.

Oil dilution raises the dipstick level. Above maximum means change it.

The plug-in hybrid versions

Both models offer a plug-in hybrid, and the diagnostic picture changes.

Generic OBD-II gives you the combustion side. Traction battery, inverter and charging data are manufacturer-specific.

Plug-in hybrid diagnostics and hybrid battery state of health monitoring.

Two things worth knowing:

The 12 V battery still matters most. A flat 12 V battery immobilises the vehicle completely, regardless of the traction battery: EV 12V battery failures.

Readiness monitors take longer to complete, because the engine runs intermittently and often at fixed operating points. That matters before an emissions test: OBD readiness monitors explained.

The electronics density

More screens, more driver assistance, more comfort modules than the smaller cars.

Consequence: greater sensitivity to battery condition, and a marginal battery produces communication codes across systems with no relationship to each other.

That looks like several faults and is one.

P0560 to P0563 system voltage faults, U0073 control module bus off and when the scanner lies about ghost codes.

Driver assistance and calibration

Camera and radar based, and requiring calibration after windscreen or bumper work.

A screen replaced without calibration leaves a system that appears to work and does not aim correctly.

ADAS calibration and windscreen chip repair vs replacement.

Where the diagnostic connector is

PSA-derived vehicles often place it behind the ashtray or in a console cubby rather than under the dash: where is the OBD port.

The automatic gearbox

The EAT8 torque converter automatic is generally durable, and complaints usually trace to fluid condition or adaptations rather than mechanical wear.

P0700 transmission control system malfunction and automatic transmission ATF diagnostics.

Buying used

1. PureTech belt history, if it is a petrol.
2. Additive reservoir status on a BlueHDi.
3. Soot load and journey pattern.
4. Battery condition under load, and resting voltage after standing.
5. ADAS calibration if there has been front-end work.
6. 12 V battery age on a hybrid.
7. Readiness and permanent codes: Mode 0A permanent DTCs.

Used car pre-purchase OBD check.

This check needs no workshop — an ELM327 adapter and the free tier of the app cover it. Check resting voltage after an overnight stand. On a module-dense car, that reading explains more warnings than the warnings do.