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P1127, P1128

Read the instructions below then start the fault diagnostic procedure.

Symptom: Check Engine on. Poor performance.

P1127, P1128


P1127 Boost Pressure To Low Mechanical Fault

P1128 Boost Pressure To High. Mechanical Fault


Fault symptom


Check Engine on. Poor performance.


Conditions

The following conditions apply for the DTC in question:


P1127: Engine temperature 40-100°C (104-212°F), intake air temperature -5&°C to +45°C (23-113°F), air pressure 88-110 kPa. This DTC will be generated if these conditions are fulfilled and the boost pressure is more than 30 kPa below the desired value for more than 6 seconds.

P1128: Engine temperature 40-100°C (104-212°F), intake air temperature -5°C to +45°C (23-113°F), air pressure 88-110 kPa. This DTC will be generated if these conditions are fulfilled and the boost pressure is more than 15 kPa above the desired value for more than 6 seconds.


Diagnostic help

P1127: The DTC indicates a mechanical malfunction. The EGR function is turned off.

P1128: The EGR function is turned off. The DTC indicates a mechanical malfunction. If DTC P0120 is present in the EDC control module at the same time as P1128 then P0120 can be neglected.