Emissions control: EGR, DPF, catalytic converter and AdBlueGeneric OBD-II codeUrgency: Garage soon

P20E8 on Peugeot: causes and affected engines

P20E8 means: reductant (AdBlue) pressure too low.^[1][2] Peugeot has 5 documented faults that can trigger it, across 5 engines, including 1.5 BlueHDi, 1.6 HDi, 2.0 BlueHDi and 2.0 HDi. Only a diagnosis can confirm the cause on your car.

Documented faults

that can trigger it

Engines

used by Peugeot, with at least one of them

Peugeot models

with at least one of these faults

Urgency

Garage soon

Reviewed on 9 October 20265 sources How we work

Documented faults in Peugeot engines that can trigger P20E8

Grouped by engine or model, from most to least important. These are faults with AdBlue: not all of them will necessarily set the code, and only a diagnosis confirms the cause on your car.

1.5 BlueHDi

In 208 I, 208 II, 308 II, 508 II, 2008 I, 2008 II and 4 more models

- Medium severityFrequency: Very frequentEmissions controlAdBlue tank and pump failure1.5 BlueHDi engines built up to August 2020 can suffer failures of the AdBlue tank pump module, with a "no engine start" countdown. The whole tank is usually replaced and Stellantis contributes to the cost up to 8 years.Repair: €1,000–€1,500

1.6 HDi

In 208 I, 301, 308 II, 508 I, 2008 I, 3008 I and 4 more models

- Medium severityFrequency: Very frequentEmissions controlAdBlue tank and pump fault (1.6 BlueHDi)The 1.6 BlueHDi engines (2013-2019) suffer from the AdBlue tank defect of Stellantis diesels: an emissions warning appears with a countdown until starting is prevented. Replacing the tank, with the integrated pump, costs over €1,000 (price in Spain), but there is an extended warranty of up to 8 years.Repair: €1,000–€1,200

2.0 BlueHDi

In 308 II, 508 I, 508 II, 3008 II, 5008 II and Expert III

- Medium severityFrequency: Very frequentEmissions controlAdBlue (SCR) tank and pump failureOn the 2.0 BlueHDi, the AdBlue tank can crystallise or fail and show a warning with a countdown to the point where the engine will not start. It is the most frequently cited fault of this engine: Stellantis compensates owners of diesels built up to August 2020, with no definitive fix.Repair: €1,000–€1,500

2.0 HDi

In 508 I, 3008 I, 3008 II, 5008 I and 5008 II

- Medium severityFrequency: Very frequentEmissions controlAdBlue tank crystallisation and failures (BlueHDi)On the 2.0 BlueHDi with SCR and AdBlue (from 2013), the system's tank, pump or sensors can fail or crystallise: a warning light appears, sometimes a false one, and if ignored the car may end up not starting. The OCU has reported it in Spain and Stellantis compensates some of those affected.Repair (garage): €800–€1,200

2.2 MultiJet / BlueHDi (Stellantis)

In Boxer III

- Low severityFrequency: OccasionalEmissions controlAdBlue (SCR) system: the warning light may not come on if the urea doser failsStellantis is correcting with software a fault whereby the warning light may not come on if the AdBlue urea injector stops working (Boxer, Jumper and Movano 2020-2022) or if the SCR diagnostics fail. The declared risk is to emissions, not safety.

Common causes of P20E8 on any make

From most to least likely, according to the sources.

1Leaks, damage or loose electrical connectors at the tank, the supply line or the AdBlue dosing module.^[3][4]
2Blocked AdBlue filter or supply line, or problems in the pressure line.^[2][4]
3Weak or failed AdBlue pump.^[2][4][5]
4Blocked dosing injector or valve, or one with urea crystals, especially on cars used for short journeys that do not reach operating temperature.^[2][4][5]

What to check first

The first diagnostic steps, from the most likely and cheapest to check to the most expensive.

1Read all the codes and resolve any others that are stored first: Jaguar Land Rover warns that they must be investigated before continuing with the procedure.^[3]
2Carry out a visual inspection of the AdBlue tank, the supply line and the dosing module: leaks, damage and loose electrical connectors. Check the wiring too.^[2][3]
3Check the filter, the pump, the lines and the dosing valve or injector, which are the components that build and maintain the pressure, and look for urea crystals in the injector and lines.^[4][5]

Full guide to P20E8: symptoms, diagnosis and whether you can drive

Frequently asked questions

Which Peugeot engines have faults that can trigger P20E8?

1.5 BlueHDi (1 fault), 1.6 HDi (1 fault), 2.0 BlueHDi (1 fault), 2.0 HDi (1 fault) and 2.2 MultiJet / BlueHDi (Stellantis) (1 fault). Each fault has its own page with the affected years and versions, the symptoms and the repair cost.

What does code P20E8 mean on a Peugeot?

Reductant (AdBlue) pressure too low. The AdBlue circuit (the reductant of the SCR system) has a pressure sensor monitored by the ECU. P20E8 is logged when the measured pressure falls below the calibrated minimum: the pump cannot build or maintain the pressure needed for dosing. It is a generic OBD-II code: it means the same on a Peugeot as on any other make.^[1][2][4]

Can I keep driving with P20E8?

Garage soon. Do not wait for the countdown to finish. The Jaguar Land Rover bulletin describes a warning that announces how many kilometres remain before the engine will not restart, RACE states that a fault in the system can prevent the engine from restarting, and Fleet Rabbit that dosing stops and a power reduction sequence begins. The exact time limit depends on each engine's calibration.^[3][4][5]

Sources

Every fact on this page links to its source. If you find an error, let us know.

P20E8 - Urea (AdBlue) Fluid Pressure Too Low | TaTThe Automotive Technician (TaT) · Technical documentation · consulted 2 October 2026
PartsAvatar.ca - Solution of OBD Code Error P20E8PartsAvatar · Technical documentation · published 2 June 2022 · consulted 2 October 2026
SSM72610 - DTC P20E8 - Reductant pressure too low - signal above allowable range (boletín TOPix de Jaguar Land Rover)Jaguar Land Rover · Manufacturer · published 29 January 2016 · consulted 2 October 2026
SCR & DEF Codes Explained: P20EE, P207F, P20E8 Complete Fleet GuideFleetRabbit · Other source · published 23 September 2026 · consulted 2 October 2026
Qué es un catalizador SCR: funcionamiento, AdBlue y mantenimientoRACE · Motoring press · published 23 September 2026 · consulted 2 October 2026 · in Spanish