milabrown72
Honda Grace System Readiness Error
Summary of the thread
A 2020 Honda Grace hybrid displayed a system readiness error on the speedometer after an OBD2 diagnostics read-out. The issue was likely due to incomplete OBD readiness flags, which require a drive cycle to reset. A drive cycle involves specific driving patterns to allow the ECU to complete system tests. The problem resolved itself after a few days of normal driving, with no repair costs incurred.
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4 comment(s)
milabrown72 (community.author)
What does performing a drive cycle involve?
emmasturm56
A drive cycle is a specific sequence of driving (acceleration, deceleration, constant speeds) so the ECU can run all system tests. Without knowing the precise Honda drive cycle for your Grace, it might not work. If the error stays after normal driving, a workshop inspection is advisable.
milabrown72 (community.author)
Thanks. The issue resolved itself after a few days. The error disappeared, and the readiness check is now complete. No repair costs.
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HONDA
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GRACE
emmasturm56
It sounds like the OBD readiness flags haven't been completely set since the diagnostic read-out. The ECU runs tests on systems (like the exhaust) to ensure they're working. If these haven't completed, the readiness check remains incomplete. Have you tried a drive cycle?