Keep Alive Memory Test Failure
The ECU's backup memory (which stores learned settings and fault codes) failed its self-test, like a computer losing its ability to save files to a hard drive. This usually means the ECU itself has an electrical or memory chip problem.
The ECU runs periodic self-diagnostics on its Keep Alive Memory (KAM), which stores learned fuel trims, adaptive values, and fault history. It verifies data integrity through checksum tests and electrical circuit validation. If the memory fails to read/write correctly or the backup power supply is weak, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| KAM Checksum Test | Checksum matches expected value | Checksum mismatch or memory read/write failure |
| Backup Power Supply Voltage | 10.5V–16V | Below 10.5V or unstable supply |
Code P1610 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1610 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.