What causes a SPN 847 code?

SPN 847 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 847 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 847 active.

How do I fix SPN 847?

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 847

J1939 SPN 847 — Engine Management parameter

What it means

Accelerator Pedal Supply Voltage / Pedal Position Sensor 1 circuit. This code typically indicates the ECM is detecting an out-of-range voltage or a supply voltage issue for the primary throttle pedal circuit.