OBD Guide
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P0654

Engine RPM Output Circuit/Open

P0654 is an OBD-II diagnostic trouble code meaning: Engine RPM Output Circuit/Open. Common causes: broken wire in the rpm output circuit from the ecu, output short circuit. Estimated repair cost: $17–556.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–556 (est.)

Symptoms

  • Check Engine light comes on
  • The tachometer does not work or shows incorrect data
  • Automatic transmission control system errors
  • Cooling fan is not working properly
  • Other electronic systems report RPM errors

Causes

  • Broken wire in the RPM output circuit from the ECU
  • Output short circuit
  • Damage to the wiring harness in the ECU area
  • Malfunction of the ECU output stage (RPM signal conditioner)
  • Malfunction of the instrument panel or other RPM signal consumer

How to Fix

  1. Check the tachometer operation with the engine running
  2. Check the presence of the RPM output signal on the corresponding ECU pin with an oscilloscope
  3. Inspect the RPM signal wire from the ECU to the dashboard and other consumers
  4. Check the serviceability of the instrument panel unit (tachometer)
  5. If there is no signal at the ECU output - diagnostics of the internal output stage of the ECU

Related codes

P0335P0336P0600P0601U0073

Error P0654 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0654 code mean?

P0654 is an OBD-II diagnostic trouble code that indicates: Engine RPM Output Circuit/Open

What causes a P0654 error code?

The most common causes of P0654 include: Broken wire in the RPM output circuit from the ECU; Output short circuit; Damage to the wiring harness in the ECU area; Malfunction of the ECU output stage (RPM signal conditioner).

How do I fix a P0654 diagnostic trouble code?

To fix P0654: Check the tachometer operation with the engine running. Check the presence of the RPM output signal on the corresponding ECU pin with an oscilloscope. Inspect the RPM signal wire from the ECU to the dashboard and other consumers. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0654?

Yes, but get it checked soon

How much does it cost to fix P0654?

The estimated repair cost for P0654 is $17–556. Actual cost depends on your vehicle, location, and labor rates.

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