Code Definition

P1607 — Cruise Control Input Processor

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Toyota

About P1607

P1607 is a manufacturer-specific powertrain diagnostic trouble code recorded for Toyota 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.

P1607 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) sets DTC P1607 when its internal cruise control input processing circuit does not perform as expected. This Toyota specific code means the ECM cannot correctly process the signals that operate the cruise control system, so the fault usually points to an internal ECM issue, unstable ECM power or ground, or a problem in the cruise control switch inputs feeding the module. When it is set, the cruise control is normally disabled and will not engage, and the malfunction indicator lamp may be illuminated. Base engine driveability is often unaffected, but the driver lo...

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