OBD Guide
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P05C8

Economy Mode Switch Circuit Range/Performance

P05C8 is an OBD-II diagnostic trouble code meaning: Economy Mode Switch Circuit Range/Performance. Common causes: partial oxidation or contamination of switch contacts, worn mechanical contacts inside the switch. Estimated repair cost: $11–67.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$11–67 (est.)

Symptoms

  • Check Engine Light Is On
  • Economy mode is activated unstable or switches spontaneously
  • The Eco Mode button responds to pressing, but the mode is not held
  • Unstable operation of functions related to Eco Mode (gas pedal, gear shift)
  • Eco indicator appears and disappears periodically on the panel

Causes

  • Partial oxidation or contamination of switch contacts
  • Worn mechanical contacts inside the switch
  • Moisture entering the switch connector, changing the resistance
  • Unreliable contact in the connector (intermittent disconnection)
  • Initial stage of switch failure

How to Fix

  1. Read frozen frame codes and data with a diagnostic scanner
  2. Inspect the Eco Mode switch and its connector for moisture, oxidation, and mechanical damage
  3. Clean the connector contacts with a special contact agent.
  4. Using a multimeter, measure the resistance of the switch in the pressed and released positions and compare with the standard values ​​from the service manual
  5. If the resistance deviates from the norm, replace the switch
  6. After the repair, erase the codes and check the operation of Eco Mode in real conditions

Related codes

P05C7P05C9P05CA

Error P05C8 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05C8 code mean?

P05C8 is an OBD-II diagnostic trouble code that indicates: Economy Mode Switch Circuit Range/Performance

What causes a P05C8 error code?

The most common causes of P05C8 include: Partial oxidation or contamination of switch contacts; Worn mechanical contacts inside the switch; Moisture entering the switch connector, changing the resistance; Unreliable contact in the connector (intermittent disconnection).

How do I fix a P05C8 diagnostic trouble code?

To fix P05C8: Read frozen frame codes and data with a diagnostic scanner. Inspect the Eco Mode switch and its connector for moisture, oxidation, and mechanical damage. Clean the connector contacts with a special contact agent.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05C8?

Do not drive — repair immediately

How much does it cost to fix P05C8?

The estimated repair cost for P05C8 is $11–67. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat