What causes a SPN 670 code?

SPN 670 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a SPN 670 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 670 active.

How do I fix SPN 670?

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

J1939 SPN

SPN 670

J1939 SPN 670 — Engine Management parameter

What it means

Total Engine Management / Accelerator Pedal Position Sensor 2 (APP2) Signal Error. This indicates a discrepancy or circuit fault related to the secondary throttle position signal used for safety redundancy.