The control module detected the fault condition "Failure to restart the engine" for the Reversible alternator. Documented for the Continental SID 807 injection ECU (DV6C 1.6 HDi) on Peugeot applications; the same PSA control units are also fitted to Citroën models.
TuningBot DTC Database · v4.37.14
P1A91 Reversible alternator : Failure to restart the engine
1 manufacturer-specific interpretation across 1 manufacturer in the TuningBot DTC database.
PSA
1 interpretationRelated and nearby codes
How to read P1A91
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Frequently asked questions about P1A91
What does P1A91 mean?
Reversible alternator : Failure to restart the engine. The control module detected the fault condition "Failure to restart the engine" for the Reversible alternator. Documented for the Continental SID 807 injection ECU (DV6C 1.6 HDi) on Peugeot applications; the same PSA control units are also fitted to Citroën models.
Is P1A91 generic or manufacturer-specific?
P1A91 is a manufacturer-specific code. In this database it is documented for: PSA. The same number can mean something different on other brands.
Can TuningBot remove P1A91 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic
