Code Definition

P0687 — Control Module Keep Alive Memory (KAM) Error

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

About P0687

P0687 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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 P0687 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 engine control module (ECM/PCM) holds learned and adaptive data in its Keep Alive Memory (KAM), including fuel trims, fault history, and idle and shift adaptations, and it relies on a constant battery feed to retain this data with the key off. During the Key On self test the PCM writes data to KAM and reads it back to confirm the memory and its power supply are intact. DTC P0687 is set when the read back data does not match what was written within tolerance, or when the KAM constant power supply has been interrupted, indicating a memory error. The most common real world cause is a loss or ...

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