Code Definition

P06EF — Engine Restart Performance

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P06EF

P06EF is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P06EF is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P06EF is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The PCM monitors the engine restart system, which is commonly associated with the auto start-stop function. Code P06EF is set when the PCM detects that the engine did not restart within the expected time or performance parameters after an auto stop event. The PCM evaluates starter motor performance, battery voltage, and engine cranking speed during the restart sequence. If the restart does not meet the required criteria, this code is stored. This code is commonly found in vehicles equipped with auto start-stop technology.

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