P0654 Code: Engine RPM Output Circuit/Open
🟢 Low severity · drivable
The car drives normally; the tachometer or other modules may just lose the engine speed signal.
What P0654 means
The engine computer sends an engine speed, or RPM, signal to other modules such as the tachometer. This code means that output circuit is open or not working, so the RPM signal isn't getting through.
Symptoms
- Check engine light is on
- Tachometer not working or jumping
- Other gauges acting up
- Cruise control may not work
Common causes
- most common: Damaged or broken wiring in the RPM output circuit
- common: Loose or corroded connector
- common: Faulty tachometer or receiving module
- less common: Faulty engine computer
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Clean and reseat the RPM signal connectors | Yes | $0–20 |
| Inspect and repair the RPM output wiring | Mechanic | $50–200 |
| Test and replace a faulty tachometer or module | Mechanic | $100–300 |
Frequently asked questions
Can I drive with a P0654 code?
Yes. The car runs normally; only the RPM signal to other modules is affected.
What does the RPM output do?
It sends the engine speed signal to the tachometer and other modules that need to know how fast the engine is turning.
How much does it cost to fix a P0654?
Usually $50–200 for wiring repairs; a faulty gauge or module is $100–300.
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Updated 2026-08. This page is informational and not a substitute for professional diagnosis.